Bovine hide glue granules from the lime and hot-water extraction route

1. Scope and Applicability

This method covers actual manufacture of dry technical bovine hide-glue granules from untanned hide stock; the full 35420 classification label does not expand it to every glue or protein product. The existing casein method ends at casein and excludes later derivatives; downstream glue-using products are also different categories. This animal-collagen extraction route is neither plant protein manufacture nor finished-product repacking. Use one route and delivery form, with actual foreground records from normal enterprise operation.

2. Product Category Identity

Field	Value
canonical_pcr_id	pcr.other-transportable-goods-except-metal-products-machinery-and-equipment.other-chemical-products-man-made-fibres.bovine-hide-glue-granules
classification_refs	CPC 3.0 35420, restricted bovine hide-glue subset; no accepted mapping is asserted
covered_products	Unformulated dry granulated technical hide glue made from untanned bovine hide stock by lime conditioning, sulfuric-acid washing, hot-water extraction, filtration, concentration and drying
excluded_products	Bone, fish, porcine or equine glue; chrome-tanned stock; edible/pharmaceutical gelatin; peptones; casein and caseinates; plant/synthetic adhesives; gelatin-scrap compounding; liquid ready-to-use glue; purchased finished-glue repacking
representative_product	Dry bovine hide-glue granules supplied as a technical collagen adhesive
production_route	One untanned bovine hide route only: receipt, washing and size preparation, lime treatment, removal of lime with water and sulfuric acid, hot-water extraction, liquor filtration, evaporation, drying, granulation, packing, storage and gate handover
market_state	Net as-supplied dry granules containing measured residual moisture; no automatic dry-protein or anhydrous correction

3. Reference Flow

Field	Value
What	Dry technical bovine hide-glue granules actually net delivered at the factory gate
How much	1 kg net whole supplied product, excluding packaging and retaining measured residual moisture
How well	Accepted to declared customer technical-adhesive specification; declare measured moisture, protein basis, gel strength, viscosity and test conditions
How long or cycle	Actual net accepted handover for one declared period and delivery cohort; no service lifetime applies
reference_flow_link	rf_delivered_glue

Field	Value
Reference amount	1
Reference product flow	Hide Glue 7b2fe9b1-13be-4c47-a6c9-21b899c724ad
Reference flow property	Mass 93a60a56-a3c8-11da-a746-0800200b9a66
Reference unit group	Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66
Reference unit	kg
Required qualifiers	bovine origin and untanned hide-stock provenance; lime and sulfuric-acid washing route with actual solution assays; dry granulated technical adhesive grade (not edible or pharmaceutical grade); lot moisture and dry-matter test method; protein content with analytical basis and any conversion factor; gel strength and viscosity with test conditions and customer specification; net product mass excluding every packaging component; actual net factory-gate delivery rather than newly released production; site and geography and reporting period and delivery-cohort identifiers; opening and closing WIP and finished-stock masses and carried burdens; return and rework and failed-run and zero-output reconciliation; utility supply and wastewater destination and residue sale evidence; packaging composition and included warehouse and loading boundary

Every qualifier must be declared in the data package. The native record is a broad industrial animal-hide glue identity; its complete name components are Hide Glue, animal glue/industrial production, and production mix/at plant, with no CAS or supply geography declared. Its comment that hide glue is mostly made from horse hides is not a horse-only specification; disclose it and establish bovine applicability with actual hide-supply evidence. It provides no bovine supplier, moisture, grade or background burden.

4. Measurement and Unit Rules

rule_id	Applies to	Required property	Required unit	Rule
reference_net_mass	reference product	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Use actual net delivered kg of whole supplied granules, excluding packaging but retaining residual moisture. Declare dry solids, protein and whole product separately; neither wet liquor nor newly released output is delivery quantity.
wet_dry_species	material and water ledgers	Mass	kg	Under calc_water_species retain complete commercial wet formulations and constituent carrier-water subledgers; separate physical water from reaction formation/consumption. Do not infer unknown species from COD or a total residual.
single_normalisation	all inventory rows	Mass	kg	Collection is unnormalized; reconcile raw period numerators and carried stock burdens under calc_delivery_cohort, then normalize exactly once under calc_gate_once using positive delivered Q from the same cohort.

5. System Boundary

rule_id	applies_to	rule	source_ids
boundary_route	scoped foreground	Include actual hide preparation, lime treatment, acid/water washing, repeated extraction, filtration, evaporation, drying, finishing and quality testing. Receipt of finished glue followed by packing does not implement this manufacturing route.	seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975
boundary_gate	scoped foreground	The reference gate is actual accepted net handover to the customer or carrier at the factory. Include attributable packing, factory storage, internal handling and loading through that gate; exclude subsequent external distribution and use. Report production releases and actual deliveries separately.	seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975
boundary_upstream	scoped foreground	Purchased untreated bovine hide stock is a complete wet commercial input. Link its actual slaughter/hide-processing supply chain, preservation, transport, supplier allocation and incoming state. A by-product description does not establish zero upstream burden. This foreground does not recreate slaughter, tanning or milk production.	seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975
boundary_utilities	scoped foreground	The representative foreground purchases steam and electricity; steam generation remains upstream, while condensate return and direct-injection water are traced at the actual interface. A site with an on-site boiler must extend the model with its individually identified fuel, water, treatment and emissions rather than delete them. Include cleaning and waste handling actually used.	seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975
boundary_waste	scoped foreground	The representative model exports separately characterised raw wastewater and wet residues to documented off-site management. Internal transfers to an on-site treatment plant require its explicit foreground expansion, each actual reagent and utility, measured treated discharge and sludge; do not label raw effluent as treated water.	seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Boundary Abstraction

Field	Value
declared_starting_condition	Untanned bovine hide stock at receipt, with actual moisture, preservation salts and pre-treatment declared; no chrome stock or bone input
starting_condition_role	Complete upstream commercial hide-stock input to actual glue manufacture
product_classification_scope	Restricted technical bovine hide-glue subset of CPC3 35420
recursive_input_rule	External same-category glue input retains upstream burdens and distinct lot identity; such repacking-only operation is excluded here. Internal glue recycling is a paired transfer; remove it on consolidation without deleting reprocessing energy or losses.
upstream_dataset_requirement	Trace actual hide supplier, animal origin, geography, time, preservation and upstream allocation; verify each utility, chemical and transport provider independently
disclosure	Disclose factory and time coverage, moisture/protein bases, net-delivery gate, stock burdens, waste destinations, co-product sale proof, included warehouse/loading, utility boundary and every unmeasured data requirement

6. Process Inventory Structure

Process Map

process_id	process_name	inclusion	inclusion_condition	role	quantitative_reference
hide_preparation	Hide preparation, liming and acid washing	required		Convert received untreated hide to washed extraction stock	per 1 kg reference flow
hot_extraction	Hot-water extraction and liquor separation	required		Extract successive glue-liquor fractions and separate spent hide	per 1 kg reference flow
drying_finishing	Filtration, evaporation, drying and granulation	required		Recover dry granules from glue liquor with measured water removal	per 1 kg reference flow
packing_delivery	Packing, warehouse, handling and actual gate delivery	required		Preserve stock burdens and deliver uniquely accepted net product	per 1 kg reference flow

The cards below identify individual exchanges of the representative route. All amounts come from the actual enterprise, not assumed recipes or operating parameters. Extend the inventory with each actual conditional device input, reagent, consumable, emitted species and treatment; non-applicability requires evidence of absence. Complete raw physical and stock ledgers precede normalized reporting; eliminate every paired internal transfer.

Process: Hide preparation, liming and acid washing (hide_preparation)

Inputs

Product flows

Untanned bovine feed (bovine_hide_stock)

Measure whole as-received wet hide stock; moisture, collagen/protein, fat and salt are constituent subledgers, not additional purchased inputs. Record supplier burden and provenance.

• Selected flow: Untanned bovine hide stock
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_prepare
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Purchased lime milk (lime_slurry)

Record the whole delivered slurry and measured Ca(OH)2 mass fraction; carrier water is already in this purchased mass. If actually prepared on site, replace this input with separately purchased lime and water and measured mixing burdens, never both descriptions.

• Selected flow: Calcium hydroxide aqueous slurry
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_prepare
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Acid wash supply (sulfuric_acid_solution)

Use actual whole purchased solution mass and assay; active acid and carrier water are constituents, not duplicate procurement. Dilution water added after receipt is separate. Reject a different acid route for this data package.

• Selected flow: Sulfuric acid aqueous solution
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_prepare
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Washing and make-up water (preparation_water)

Collect actual fresh water crossing this process boundary, including washing, dilution and cleaning. Keep internal recirculation separate; do not add slurry/acid carrier water again.

• Selected flow: Process water
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_prepare
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Preparation power (preparation_electricity)

Meter washing drums, mills, pumps and attributable cleaning and idle/failed-run loads; use actual submeter or supported site allocation.

• Selected flow: Electricity
• Flow property / unit: Energy / kWh
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_prepare
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Inbound carriage (inbound_road_freight)

Collect actual inbound commercial loads, distance, payload, return-leg convention and provider. Do not also count vehicle diesel inside this purchased service.

• Selected flow: Road freight transport service
• Flow property / unit: Transport performance / t*km
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_prepare
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Waste flows

Elementary flows

Outputs

Product flows

Internal prepared stock transfer (prepared_hide_out)

Paired wet-mass internal transfer to hot_extraction; carry solids, water and accumulated burdens, and eliminate only this paired exchange on consolidation.

• Selected flow: Washed limed and acid-treated bovine hide stock
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_prepare
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Waste flows

Raw wash effluent (preparation_wastewater)

Measure actual discharged wet effluent, dissolved salts, suspended solids, C/N/Ca/S and destination; do not declare treated status or infer solids from COD.

• Selected flow: Raw lime and acid hide-washing wastewater
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_water
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Separated liming solids (spent_lime_solids)

Separate any physically removed solids from wastewater; record wet mass, solids, entrained water and actual disposal. Do not count the same suspended material twice.

• Selected flow: Wet spent liming solids
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_water
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Elementary flows

Process: Hot-water extraction and liquor separation (hot_extraction)

Inputs

Product flows

Internal prepared stock receipt (prepared_hide_in)

Match prepared_hide_out by lot, wet mass, solids and burdens; internal recycled stock is not a second upstream purchase.

• Selected flow: Washed limed and acid-treated bovine hide stock
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_extract
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Extraction water (extraction_water)

Record fresh extraction and cleaning water; account for water already in wet stock and any actual injected steam separately.

• Selected flow: Process water
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_extract
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Purchased extraction steam (extraction_steam)

Use metered heat delivered and pressure/temperature/enthalpy evidence. Also record physical steam and condensate masses in the water ledger. Distinguish indirect heating from any measured direct injection without double counting heat.

• Selected flow: Steam
• Flow property / unit: Energy / MJ
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_extract
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Extraction power (extraction_electricity)

Meter extraction circulation, transfer pumps and attributable cleaning/idle loads for every grade and failed run.

• Selected flow: Electricity
• Flow property / unit: Energy / kWh
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_extract
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Waste flows

Elementary flows

Outputs

Product flows

Internal liquor transfer (glue_liquor_out)

Record each actual extraction fraction as wet liquor with measured solids/protein, water and carried burdens; it is not the dry terminal product.

• Selected flow: Aqueous bovine hide-glue extract
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_extract
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Waste flows

Spent hide tankage (extracted_hide_tankage)

Measure wet residue and moisture separately from liquor and effluent. Waste is the default; a demonstrated co-product must be represented as a separate qualified Product output with its real sale gate and allocation, never renamed to hide grade or dry glue.

• Selected flow: Wet extracted bovine hide residue
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_water
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Separated grease (recovered_grease)

Include only when grease is physically recovered; retain water/impurity assays. Default waste management applies unless actual accepted sale evidence justifies a separate Product output and reviewed allocation.

• Selected flow: Recovered bovine hide grease
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_water
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Cook-house effluent (extraction_wastewater)

Record actual cooker drains, cleaning losses and separate condensate destinations; subtract no hypothetical saleable protein.

• Selected flow: Raw hide-extraction wastewater
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_water
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Elementary flows

Process: Filtration, evaporation, drying and granulation (drying_finishing)

Inputs

Product flows

Internal liquor receipt (glue_liquor_in)

Match glue_liquor_out, including water and grade-specific carried burdens; record actual filtration and concentration losses.

• Selected flow: Aqueous bovine hide-glue extract
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_dry
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Purchased concentration and drying steam (drying_steam)

Meter supplied heat to evaporation and drying; retain steam/condensate mass and enthalpy bases, not a default energy per kg of removed water.

• Selected flow: Steam
• Flow property / unit: Energy / MJ
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_dry
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Filtration and finishing power (finishing_electricity)

Include pumps, filtration, vacuum, fans, chilling when used, granulation, recovery, cleaning and zero-output consumption. Identify any actual refrigerant leak separately.

• Selected flow: Electricity
• Flow property / unit: Energy / kWh
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_dry
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Cooling and cleaning water make-up (drying_makeup_water)

Meter actual external make-up only; distinguish recycled cooling water, cleaning water and process condensate.

• Selected flow: Process water
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_dry
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Waste flows

Elementary flows

Outputs

Product flows

Internal dry granules transfer (granules_internal_out)

Use this verified broad identity for actual technical bovine granules. Its native comment says hides/skins, mostly horse hides; that is a general predominance claim, not a horse-only specification. No CAS or geography is declared, and no supplier equivalence is inferred. Transfer lot moisture, solids, quality and burdens to packing_delivery; new release is not delivery Q.

• Selected flow: Hide Glue 7b2fe9b1-13be-4c47-a6c9-21b899c724ad
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_dry
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Waste flows

Filter residue (filter_residue)

Measure separately removed wet filter residue and composition; include actual filter-media consumption as an additional individually specified input if used.

• Selected flow: Wet bovine glue filtration residue
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_water
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Exported process condensate (condensate_out)

Measure liquid condensed from product water and its actual organic carryover and destination. Keep purchased-steam utility condensate separate in the water subledger and model its actual external return if present.

• Selected flow: Hide-glue evaporation condensate
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_water
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Elementary flows

Uncondensed product water (water_vapour)

Determine actual uncondensed water release from independently measured evaporation/condensation and air moisture balances; it excludes already counted condensate and is not an assumed reaction-water residual.

• Selected flow: Water vapour to air
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_water
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Unrecovered glue dust (glue_dust)

Include actual measured or supported exhaust release after control; captured reusable fines are internal paired recycle and captured discarded fines require a separate waste row. No default zero emission follows from installing a filter.

• Selected flow: Bovine hide-glue particulate to air
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_water
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Process: Packing, warehouse, handling and actual gate delivery (packing_delivery)

Inputs

Product flows

Internal dry granules receipt (granules_internal_in)

Match granules_internal_out with carried burdens and actual moisture. Opening finished stock is separately retained with historical burdens, not treated as new production.

• Selected flow: Hide Glue 7b2fe9b1-13be-4c47-a6c9-21b899c724ad
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_gate
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Outer paper sack (kraft_bag)

Weigh actual outer sacks with supplier composition and loss records; count the sack separately from a polymer liner.

• Selected flow: Kraft paper sack
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_gate
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Polyethylene inner liner (pe_liner)

Include only the actually supplied liner; verify polymer and supplied mass. An absent liner must be demonstrated, not silently assumed.

• Selected flow: Polyethylene bag liner
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_gate
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Packing and warehouse electricity (packing_electricity)

Include weighing, packing, lighting, warehouse handling, return inspection and loading electricity actually attributable to delivery cohorts, using storage duration and location records where relevant.

• Selected flow: Electricity
• Flow property / unit: Energy / kWh
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_gate
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

On-site diesel handling (handling_diesel)

Include when an actual diesel handling vehicle is within the gate boundary; meter consumption, fuel assay and duty. Add each actual combustion species as a separate elementary row using site evidence. Electric-only sites retain proof of non-use rather than a fabricated diesel input.

• Selected flow: Diesel fuel
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_gate
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Waste flows

Elementary flows

Outputs

Product flows

Net accepted gate delivery (rf_delivered_glue)

Only this row is the terminal reference. Q is unique actual net accepted handover of the scoped granules, excluding packaging and corrected for returns in the original cohort. Report measured residual moisture and protein separately; no purity, dry-solids or protein factor changes the supplied product mass.

• Selected flow: Hide Glue 7b2fe9b1-13be-4c47-a6c9-21b899c724ad
• Flow property / unit: Mass / kg
• Amount rule: 1 kg
• Value mode: fixed_value
• Specificity: product_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: method_formula
• Collection protocol: cp_gate
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Waste flows

Irrecoverable rejected product (discarded_glue)

Measure actual destroyed rejected or returned granules with retained historic and rework burdens; goods retained for future rework remain stock, not waste and not Q.

• Selected flow: Rejected bovine hide-glue granules
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_gate
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Discarded paper sack (paper_sack_waste)

Record actual packing rejects and damaged sacks separately with disposal/recycling destination; sale packaging supplied with product is not foreground waste.

• Selected flow: Waste kraft paper sack
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_gate
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Discarded polyethylene liner (pe_liner_waste)

Measure actual discarded liners and destination, excluding liners leaving as product packaging.

• Selected flow: Waste polyethylene bag liner
• Flow property / unit: Mass / kg
• Amount rule: A_row / Q; one reporting operation after raw conversion and the stock-burden reconciliation in section 8.
• Value mode: calculated_value
• Specificity: site_specific
• Normalization basis: per 1 kg reference flow
• Basis kind: reference_flow
• Evidence kind: calculated_from_collection
• Collection protocol: cp_gate
• Sources: seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975

Elementary flows

7. Allocation and Co-product Handling

rule_id	applies_to	rule	source_ids
allocation_separation	scoped foreground	Trace individual extraction runs and glue grades. Assign separable materials, energy, packaging, storage and treatment directly using actual meters and batch records before allocating shared operations. Do not assign all burdens to the first extraction or count later extracts as burden-free.	seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975
allocation_sale_gate	scoped foreground	Wet extracted hide tankage, grease and filter solids are physically distinct streams. Treat each as waste unless its actual sale specification, legal destination, accepted net quantity, transfer record and market evidence demonstrate a co-product at the stated gate. Historic recovery examples establish a possibility, not this site's sale. Never substitute dry residue mass for measured wet dispatch.	seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975
allocation_shared	scoped foreground	For remaining joint burdens, document the actual causal relationship and measured physical driver. If no defensible physical relationship exists, declare an explicitly reviewed site-specific allocation with contemporaneous quantities and prices at a common gate and sensitivity analysis; keep the unallocated ledger. No borrowed dairy/IDF, livestock or organisation economic coefficient, automatic avoided-product credit, or negative upstream-hide burden is allowed.	seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975
asset_manufacture_conservation	existing capital/reusable manufacture attribution	Within the applicable allocation decision context, original manufacture burden attributed across uses of actual capital equipment or reusable articles already included in foreground production, packaging or observed services uses one persistent same-asset ledger across all crops, products, cohorts, manufacturing/postrelease services, owners and observation periods. D is its supported whole installed service: all realized historical service plus supported remaining service in the same units as actual beneficiary use u; D must be finite and positive. Period capacity, remaining-only capacity, the physical asset/article mass alone, or current-period product Q alone is not D; supported whole-service throughput in mass units may be used when it demonstrates the causal service and matches u. This does not amortize the manufactured reference product over downstream life or change its declared reference gate/Q. The fractions u/D and all previously assigned manufacture shares together must never exceed 1. Changes of window, custody, provider or repair never restart the original manufacture balance. Replacements have distinct identities and only their real new manufacture vectors; actual repair and treatment increments remain separately accounted. Revised capacity evidence requires transparent reconciliation of prior shares and sensitivity, not a fresh ledger. Keep full physical mass and stock movements independent of burden shares. Unknown D, prior shares or beneficiary coverage requires review and no final manufacture-attributed amount; no assumed lifetime, utilization, zero or arbitrary division is permitted. For each existing collection protocol that attributes manufacture of included production, packaging or observed-service assets across uses in this route (excluding amortization of the manufactured reference product itself), additionally retain a durable asset identity, its measured full physical mass and acquisition/installation/retirement stock history, original manufacture burden vector, all historical and current beneficiaries, matched-unit service readings, the evidenced whole installed-service denominator D, supported remaining-service basis and uncertainty, prior assigned shares and remaining original manufacture balance. Carry the ledger across reporting windows and custody/provider changes. Collect actual repair, replacement, recovery and treatment separately; these records do not normalize physical movements or create an additional asset purchase. These are added fields and conservation obligations for the existing applicable protocols, not a new assumed capital inventory.

8. Foreground Data Collection, Calculation, and Quality Rules

Data Collection Protocols

For each existing collection protocol that attributes manufacture of included production, packaging or observed-service assets across uses in this route (excluding amortization of the manufactured reference product itself), additionally retain a durable asset identity, its measured full physical mass and acquisition/installation/retirement stock history, original manufacture burden vector, all historical and current beneficiaries, matched-unit service readings, the evidenced whole installed-service denominator D, supported remaining-service basis and uncertainty, prior assigned shares and remaining original manufacture balance. Carry the ledger across reporting windows and custody/provider changes. Collect actual repair, replacement, recovery and treatment separately; these records do not normalize physical movements or create an additional asset purchase. These are added fields and conservation obligations for the existing applicable protocols, not a new assumed capital inventory.

protocol_id	process_id	flow_role	record_type	raw_fields	collection_method	unit	frequency	temporal_coverage	site_scope	aggregation_rule	quality_evidence
cp_prepare	hide_preparation	Receipt, liming, acid washing and inbound supply	foreground_records	site; period; lot; owner; whole wet hide mass; provenance; moisture; protein; salt; supplier burden; whole slurry mass and assay; whole acid solution mass and assay; fresh water; meter readings; freight payload and km; failed runs; WIP opening/closing mass and carried burdens	Owner: production and procurement data steward. Collect unnormalized weigh tickets, assays, stock movements, meter differences and supplier records for the complete matched period. Do not divide by Q during collection; quantify dilution and internal preparation separately from procurement.	kg; kWh; t*km	each batch and event; period close	same complete actual reporting period including failures and zero-output	declared single site and matched route/product cohort	per 1 kg reference flow	calibration; signed batches; supplier CoA; route/provenance; freight records; stock burden reconciliation
cp_extract	hot_extraction	Extraction fractions and utilities	foreground_records	site; period; lot; owner; paired hide transfer; wet liquor per extraction; solids/protein assay; fresh water; integrated steam heat and mass; condensate; electricity; failed/zero-output runs; rework; opening/closing WIP and carried burdens	Owner: extraction supervisor and utility metering steward. Retain every extraction and actual raw utility numerator, including unsuccessful runs; link batch fractions and opening/closing WIP burdens without any A/Q operation. Measure steam state and determine direct-injection versus indirect heating.	kg; MJ; kWh	each batch and event; period close	same complete actual reporting period including failures and zero-output	declared single site and matched route/product cohort	per 1 kg reference flow	paired batch transfers; solids assays; steam/condensate and enthalpy records; calibrated meters; grade records
cp_dry	drying_finishing	Liquor finishing, water removal and granule release	foreground_records	site; period; lot; owner; liquor wet mass and dry matter; granule wet mass and moisture; protein basis; gel strength/viscosity and methods; electricity; heat; steam/condensate mass; cooling/cleaning make-up; recycle fines; failed runs; opening/closing WIP and carried burdens; new-release event id	Owner: finishing supervisor and quality laboratory. Record complete unnormalized batch and meter records including failed drying, captured fines and cleaning. Determine actual product quality and residual water; link every internal release to packing stock. A release is neither delivery Q nor an extra closing-stock output.	kg; MJ; kWh; declared assay units	each batch and event; period close	same complete actual reporting period including failures and zero-output	declared single site and matched route/product cohort	per 1 kg reference flow	calibration; laboratory methods; unique release ids; fraction balances; recycle and stock logs
cp_gate	packing_delivery	Actual net deliveries, stocks, returns and packing	foreground_records	site; period; delivery cohort; owner; unique handover id; accepted net product kg; packaging tare and composition; lot moisture; opening/closing FG mass and carried burdens; new releases; transfers; returns and original handover links; rework and failed runs; paper and liner inputs/losses; warehouse duration/location; electricity; diesel; loading records	Owner: warehouse and dispatch steward with quality acceptance owner. Collect raw event quantities, unnormalized burdens and complete WIP/FG carried burdens; derive positive unique net accepted delivery Q only from actual handovers corrected in the original return cohort. Retain undelivered stock and its burdens; production release is not assumed equal to Q. Reinspection/reacceptance cannot mint a second product.	kg; kWh; recorded storage hours	each batch and event; period close	same complete actual reporting period including failures and zero-output	declared single site and matched route/product cohort	per 1 kg reference flow	signed carrier/customer acceptance; calibrated net weights; lot tracking; packaging bills; stock and burden reconciliation; return links; meters
cp_water	drying_finishing	Physical water, species, effluent and residue records	foreground_records	site; period; lot; owner; fresh/carrier/feed water; steam and condensate; hydrolysis evidence; acid/base assays; actual neutralisation extent; dissolved ions and hydrate state; wet outlet masses; solids/moisture/protein; C/N/Ca/S; gas/air humidity; integrated volume; measured density/state; treatment destination; sale or disposal evidence; opening/closing water/species stock	Owner: environmental laboratory and process chemist, hosted by drying_finishing and covering hide_preparation, hot_extraction and drying_finishing. Retain unnormalized measured mass/volume, composition and actual reaction evidence independently. Obtain reaction extent from assayed reagents/species and validated chemistry, not a mass residual or COD. Separate liquid effluent, residue, condensate and vapour; prove any sale and actual treatment. Keep full stock water/species and carried burdens.	kg; m3; declared assay units	each batch and event; period close	same complete actual reporting period including failures and zero-output	declared single site and matched route/product cohort	per 1 kg reference flow	calibrated flow/weight records; independently supported density; laboratory speciation; validated mechanism/extent; outlet samples; manifests and actual sale proof

Calculation Rules

rule_id	Applies to	Formula or rule	Inputs	Output	source_ids
calc_raw_units	all inventory rows	Convert raw records before aggregation: rate times actual duration gives an integrated amount; an already integrated liquid/gas volume receives no further time multiplier. Convert volume to mass using independently supported density at the recorded temperature/composition; no native secondary property coefficient is assumed to be density. Preserve electricity kWh and steam MJ separately.	raw_measurement; duration_if_rate; density_if_volume; cp_prepare; cp_extract; cp_dry; cp_gate; cp_water	raw_period_exchange	seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975
calc_delivery_cohort	all inventory rows	For each raw exchange/burden component, reconcile opening WIP and finished-stock burdens plus complete actual period additions, less closing WIP and finished-stock burdens and burdens assigned with evidence to other product/cohorts. This yields A_row attributable to the declared delivered cohort, after documented joint-product allocation. Include its failed/zero-output, return, rework, warehouse, packing and loading loads; do not remove genuine incurred losses. Pair and eliminate internal transfers once without deleting their external burdens. Keep a separate raw physical ledger, stock ledger and burden bridge; do not subtract a stock mass from electricity.	raw_period_exchange; opening_WIP_burdens; closing_WIP_burdens; opening_FG_burdens; closing_FG_burdens; other_cohort_burdens; cp_prepare; cp_extract; cp_dry; cp_gate; cp_water	A_row	seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975
calc_gate_once	all inventory rows	Report each non-reference exchange as A_row / Q for per 1 kg reference flow; Q is the positive unique actual net accepted factory-gate delivery kg of this product/route/state/cohort excluding packaging and corrected for returns against original handovers. The reference output is 1 kg. Perform this division exactly once after raw conversions and stock/burden reconciliation; the card expression and protocol aggregation instruction describe this same reporting operation, not successive divisions. No per-kg result exists for Q=0; retain its burdens for explicit attribution or carryover.	A_row; Q; cp_gate	exchange_per_kg_delivered	seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975
calc_water_species	all inventory rows	For each stock/stream, distinguish whole wet mass, measured water, dry solids and measured protein; dry matter equals wet mass times one minus measured water fraction, not protein mass. Establish total mass and element conservation independently. In the actual lime/sulfuric-acid step, distinguish acid-base water formation from collagen-hydrolysis water consumption and physical evaporation. Quantify the former from independently verified actual neutralisation extent; determine hydrolysis contribution from independent validated reaction/analytical evidence, never a closure residual. Record dissolved calcium/sulfate and actual hydration state without assuming all sulfate precipitates as gypsum. Reconcile water entering with hide, solutions, fresh water and direct steam, reaction formation/consumption, water leaving in glue, effluent, residue, vapour, condensate and opening/closing stocks. Do not fit two unknowns with one balance.	raw_period_exchange; actual_reaction_extent; speciation_evidence; moisture_assays; opening_closing_stock; cp_water	independent_mass_element_water_ledgers	seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975
asset_manufacture_share	existing capital/reusable manufacture attribution	For each included original asset manufacture vector B, f_current = u_current / D only after the persistent ledger verifies the supported whole installed-service denominator, all beneficiaries and prior assigned shares. Attribute f_current * B once to the actual beneficiary before the existing single reference normalization. Check prior_shares + all current/new beneficiary shares <= 1; carry the remaining original balance. Capacity revisions reconcile the historical ledger. Full physical asset/packaging mass and actual gross stocks/returns never receive f_current. Unknown D or history leaves the final attributed result unavailable, without suppressing actual repair/replacement/service burdens.	asset_id; original_B; u_current; D; historical_beneficiaries; prior_shares; capacity_evidence	conserved attributed manufacture vector

Data Quality Requirements

requirement_id	Applies to	Requirement	Evidence
quality_identity	reference and feed identity	Use native broad Hide Glue only with the qualified bovine technical route and full limitations; native geography/CAS are unspecified, not inferred. Prove supplier route and grade independently.	actual supplier, production, laboratory, warehouse and delivery records; applicable primary sources
quality_period	every collection protocol	Use one complete actual reporting period and site per disclosed scope. Preserve normal operations, maintenance, cleaning, failures and zero-output work; reconcile any exclusions to their actual receiving cohort.	actual supplier, production, laboratory, warehouse and delivery records; applicable primary sources
quality_representativeness	external evidence and enterprise package	SelJel is a manufacturer-specific bovine technical example, not an industry yield or universal moisture factor; EPA reports describe historic US processes, with the 1975 report marked draft. No numerical yield, duration, dose, emission or allocation factor is transferred. Actual enterprise data, quality specifications, utility configuration, wastewater and supplier matching remain required.	actual supplier, production, laboratory, warehouse and delivery records; applicable primary sources
quality_completeness	inventory extensions	Identify each actual cleaning reagent, filter consumable, preservative, pallet, refrigerant, combustion species and treatment operation separately when present; document genuine absence. These site data requirements cannot be replaced by an omnibus flow or silent zero.	actual supplier, production, laboratory, warehouse and delivery records; applicable primary sources

9. Validation Rules

rule_id	applies_to	rule	source_ids
validate_scope	scoped foreground	Verify bovine untanned hide provenance, actual lime/sulfuric-acid route and granulated technical product specification; reject true native grade, route, medium or material contradictions.	seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975
validate_gate	scoped foreground	Require positive Q from unique net accepted delivery events, linked to lots and gate records. Newly released production, internal granule transfers and finished-stock increases are not additional deliveries. Returns and repeat acceptance create no second output; correct the original delivery cohort and carry its burdens.	seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975
validate_inventory	scoped foreground	Retain all matched-period raw inputs and burdens, including failed and zero-output runs, rework, returns, opening/closing WIP and finished-stock carryover. Reconcile cohort attribution and stock transfers before one normalization. Q=0 does not permit discarding the numerator or publishing a finite per-kg inventory.	seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975
validate_balance	scoped foreground	Close total physical mass and C/N/Ca/S balances separately from the water/species ledger. Reconcile assayed commercial solutions, feed water, steam, evaporation, wastewater, wet residues and stocks. COD/BOD are analytical indicators, not a conversion to gelatin or an unknown balancing species. Do not fit reaction water and another unknown outlet from one residual.	seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975
validate_evidence	scoped foreground	Require actual supplier/background compatibility, native identity limitations, calibration, assay, source evidence and complete bilingual fields. Unsupported species, sale status or allocation is an explicit data-package gap rather than an inferred number.	seljel-technical-catalogue; epa-hide-glue-1977; epa-animal-glue-1975
validate_asset_manufacture_conservation	existing capital/reusable manufacture attribution	For every included capital/reusable manufacture attribution verify same-asset continuity, whole installed service in matched units, all historical/current beneficiaries, prior assigned manufacture shares and cumulative share <= 1. Reject a reset by period, cohort, provider, owner or repair. Check distinct real replacement and incremental repair/treatment vectors separately and preserve gross physical mass. A missing denominator, unexplained previous allocation or incomplete beneficiary ledger requires explicit review and an unavailable final attributed amount; structural inspection cannot claim empirical completeness.

10. Published Dataset Profile

Field	Value
dataset_role	secondary_dataset; background_dataset
downstream_use	Technical collagen-adhesive input to downstream manufacturing with compatible supplier, route, grade, state, geography and time
allowed_use	Qualified bovine dry-granule production and actual net factory-gate supply after evidence and scientific review
excluded_use	No automatic applicability to other animals, edible/pharma gelatin, protein hydrolysates, caseinates, compounded liquid glue or recycled pharmaceutical gelatin; no clinical or culture-use instruction
required_metadata	All required qualifiers, native identity limitations, source/protocol ids, raw-period and stock burden bridge, measured product quality and actual supplier/background datasets
required_quality_disclosure	Unmeasured site/provider fields, calibration/assay quality, mass/species balance uncertainty, residue classification and any reviewed allocation; identity compatibility is not scientific approval
update_trigger	Changes to feed species/treatment, acid, supplier, recipe, drying, utility boundary, reference gate, quality, waste treatment, sale status, allocation or evidence

11. Data Sources

source_id	type	reference	used_for
seljel-technical-catalogue	handbook	SelJel product catalogue, Technical Gelatine, PDF page 12, printed pp.22-23; https://seljel.com/katalog.pdf	Primary manufacturer support for bovine hide route, lime treatment, acid/water washing, extraction/evaporation/drying and granular technical form. Reported 10-12% moisture is that product example only, not a conversion factor or universal grade. Catalogue is undated (PDF metadata created2021); no site yield, utility, acid identity or allocation is established.
epa-hide-glue-1977	official_guidance	US EPA, Potential Environmental Impact of Compounding and Fabricating Industries: A Preliminary Assessment, EPA-600/2-77-160, August1977, pp.55-56 and Figure26; https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=9100PHTX.TXT	Historic primary industrial report supporting hide-glue manufacture through cleaning, hot-water extraction, filtration, evaporation and drying with separate water and solids outlets. Official HTML/TXT rendering; not a current plant recipe, performance factor or acquired publisher PDF. Bone/casein/fish and other adhesive branches are excluded.
epa-animal-glue-1975	literature	US EPA, Development Document for Effluent Limitations Guidelines and Standards of Performance, Miscellaneous Chemicals Industry, prepared by Roy F. Weston under contract 68-01-2932, February1975 DRAFT, animal-glue sections IV-102 and IV-105 to IV-107; https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=2000UTT8.TXT	Historic contractor draft (not Agency-reviewed and not an official EPA publication) primary industrial evidence for lime-conditioned hide, dilute sulfuric-acid removal of residual lime, hot-water extraction and effluent origins; tankage/grease recovery is a possible outlet requiring actual sale proof. Not legal advice, current regulatory limits or transferable dosage, yield, wastewater loading or allocation. Preserve separation from fleshings, chrome splits and bone routes.