Drafting tables and machines, and other drawing, marking-out or mathematical calculating instruments

1. Scope and Applicability

This PCR applies to factory-gate foreground data packages for finished drafting tables and drafting machines and for dedicated drawing, marking-out, or mathematical calculating instruments within the category identity below. It covers the declared in-house combination of metal fabrication, surface preparation and coating, assembly and testing, and dispatch packaging. Each dataset shall identify the particular product variant and record only the conditional routes that actually occur.

Precision balances, hand-held length-measuring instruments, separately supplied parts and accessories, general-purpose furniture, and general-purpose electronic computers or calculators are excluded. Use and maintenance, distribution after the factory gate, and end-of-life are outside this PCR. The category boundary follows the official CPC structure (un-cpc-3-0-structure-2025); manufacturing-stage coverage is informed by the official metal-fabrication and surface-treatment descriptions (us-epa-municipal-pretreatment-1993, eu-jrc-surface-treatment-metals-plastics-2006).

2. Product Category Identity

Field	Value
canonical_pcr_id	pcr.metal-products-machinery-and-equipment.medical-appliances-precision-and-optical-instruments-watches-and-clocks.drafting-tables-and-machines-and-other-drawing-marking-out-or-mathematical-calculating-817a935c
classification_refs	CPC 3.0: 48232, exact scope context
covered_products	Finished drafting tables and machines, and dedicated drawing, marking-out or mathematical calculating instruments
excluded_products	Precision balances; hand-held instruments for measuring length; separately supplied parts and accessories; general-purpose furniture; general-purpose electronic computing equipment
representative_product	The declared finished product variant produced by the reporting facility
production_route	Route-specific combination of component fabrication, optional surface preparation and powder coating, final assembly and testing, and packaging
market_state	Conforming finished product at the factory gate, ready for dispatch; reference mass excludes dispatch packaging

3. Reference Flow

Field	Value
What	Provide a finished product capable of the declared drafting, drawing, marking-out, or mathematical calculating function
How much	1 kg net mass of conforming finished product
How well	Meets the manufacturer's declared product-variant dimensions, accuracy or alignment criteria, stability criteria, and release inspection
How long or cycle	One factory-gate production output; service life is declared separately and is not part of the reference amount
reference_flow_link	The reference amount equals the net mass of as_finished_product; dispatch packaging is inventoried separately and excluded from that net mass

Field	Value
Reference amount	1 kg
Reference product flow	Drafting tables and machines, and other drawing, marking-out or mathematical calculating instruments c1e54809-bd7b-4f5b-bc54-8ef236a2889b
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	product family and model; drafting table, drafting machine, drawing instrument, marking-out instrument, or mathematical calculating instrument; net product mass; principal materials and purchased-component bill; in-house processes; surface-finish route; packaging configuration; production geography; reporting period; release-test criteria

When constructing a foreground data package, the items listed in Required qualifiers must be declared in dataset metadata, process notes, reference flow comment, product description, or an equivalent data package field. Missing required qualifiers make the reference flow definition incomplete for that data package.

4. Measurement and Unit Rules

rule_id	Applies to	Required property	Required unit	Rule
mu_net_product_mass	reference product and as_finished_product	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Determine net mass from calibrated weighing or a verified component mass roll-up; exclude corrugated boxes, film, pallets, manuals, and other dispatch packaging.
mu_material_mass	material and waste rows	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Use measured mass or inventory mass converted to kg; retain stock-form, alloy or composition, and moisture qualifiers where they materially affect identity.
mu_electricity_energy	electricity rows	Net calorific value 93a60a56-a3c8-11da-a746-0800200b9a66	MJ	Convert metered electricity from kWh to MJ using 1 kWh = 3.6 MJ and disclose the original meter unit, voltage level, grid geography, and any allocation from shared meters.
mu_gas_volume	industrial oxygen	Volume 93a60a56-a3c8-22da-a746-0800200c9a66	m3	State the reference temperature and pressure for metered or supplier-reported gas volume; do not combine oxygen and shielding gas in one quantity.
mu_water_mass	process water and wastewater	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Prefer direct mass measurement; when volume is metered, document density and reference conditions used for conversion to kg.

5. System Boundary

The foreground boundary starts when purchased material stock, ready-to-assemble components, treatment chemicals, utilities, and packaging are received by the reporting facility. It ends when a conforming product has passed release testing and is packaged for dispatch. Upstream production and delivery of all purchased inputs shall be linked to supplier-specific or representative upstream datasets; onsite fabrication, finishing, assembly, testing, rejects, and waste management transfers are foreground records.

Boundary Abstraction

Field	Value
declared_starting_condition	Purchased stock and ready-to-assemble components at facility receiving, with material grade, component state, supplier, and delivered mass declared
starting_condition_role	Upstream-to-foreground hand-off
product_classification_scope	Finished products within the semantic CPC 3.0 subclass 48232 boundary, independently of the external classification path
recursive_input_rule	A purchased input already meeting this same finished-product category is recorded as an upstream product input with its own dataset and is not recursively disassembled inside the foreground model
upstream_dataset_requirement	Link every purchased material, component, chemical, utility, and packaging flow to a geographically and technologically representative upstream dataset; disclose proxies
disclosure	Declare included and excluded process routes, product variant, net-mass method, bill of materials, finishing chemistry, release test, waste destinations, geography, reporting period, allocation, and any proxy dataset

rule_id	Applies to	Rule	source_ids
sb_factory_gate	all datasets	Include receiving through packaged factory-gate output; exclude downstream distribution, use, maintenance, and end-of-life unless a separate study expands the boundary.	eu-jrc-ilcd-handbook-lca-detailed-guidance-2010
sb_route_specificity	conditional processes and rows	Include a conditional process or exchange only when the declared product variant and site records show that route occurs; do not populate mutually exclusive routes as simultaneous defaults.	us-epa-municipal-pretreatment-1993; eu-jrc-surface-treatment-metals-plastics-2006
sb_upstream_links	purchased inputs	Keep supplier production outside the foreground gate but connect each purchased input to an upstream dataset with disclosed geography, technology, and product state.	eu-jrc-ilcd-handbook-lca-detailed-guidance-2010

6. Process Inventory Structure

Process Map

process_id	process_name	inclusion	inclusion_condition	role	quantitative_reference
metal_component_fabrication	Metal component cutting, forming, machining, and joining	conditional	Include when steel or aluminium stock is cut, formed, machined, or joined onsite; omit when all metal components arrive ready for assembly	Foreground component fabrication	kg net fabricated metal incorporated in conforming output
surface_preparation_and_powder_coating	Metal surface preparation and powder coating	conditional	Include when aqueous cleaning, chemical preparation, or powder coating occurs onsite	Foreground surface finishing	m2 treated surface and kg coated part output, both reported
final_assembly_and_testing	Final assembly, adjustment, and release testing	required	Always included for the declared finished product	Foreground product assembly and quality release	kg conforming finished product before dispatch packaging
packaging	Dispatch packaging	required	Always included; zero use requires documented reusable or packaging-free dispatch	Foreground packing	kg conforming finished product packed for dispatch

Process: Metal component cutting, forming, machining, and joining (metal_component_fabrication)

Inputs

Product flows

Cold-rolled carbon-steel sheet (mf_cold_rolled_steel_sheet)

Record cold-rolled carbon-steel sheet entering onsite cutting, forming, machining, or joining when it appears in the declared bill of materials. Its Tiangong UUID remains unresolved because the sheet-like candidates have conflicting bilingual identities.

• Selected flow: Cold-rolled carbon-steel sheet
• Flow property / unit: Mass / kg
• Amount rule: measured received or issued mass attributable to conforming production plus the corresponding measured steel scrap
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg net conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_fabrication_materials
• Sources:

Aluminium sheet (mf_aluminium_sheet)

Record aluminium sheet entering onsite fabrication only for product variants that use it.

• Selected flow: aluminium sheet 4f197be4-7b3b-11dd-ad8b-0800200c9a66
• Flow property / unit: Mass / kg
• Amount rule: measured received or issued mass attributable to conforming production plus the corresponding measured aluminium scrap
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg net conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_fabrication_materials
• Sources:

Fabrication electricity (mf_electricity)

Record purchased electricity consumed by cutting, forming, machining, welding, extraction, and directly associated fabrication equipment.

• Selected flow: Electricity 890a70b7-b677-4e2a-8a1b-7d017e0a10ae
• Flow property / unit: Net calorific value / MJ
• Amount rule: submetered electricity or documented allocation from a facility meter to fabrication equipment and production lots
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg net conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_process_energy
• Sources:

Industrial oxygen for thermal cutting or welding (mf_industrial_oxygen)

Record industrial oxygen only when an onsite thermal-cutting or oxygen-consuming welding route is used.

• Selected flow: Industrial oxygen bd4b0f96-2090-4806-a648-335ab20ff401
• Flow property / unit: Volume / m3
• Amount rule: metered volume or supplier-cylinder withdrawal attributable to the included route, at declared reference conditions
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg net conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_fabrication_gases
• Sources:

Carbon-dioxide shielding gas (mf_carbon_dioxide_shielding)

Record carbon dioxide product only when it is supplied as shielding gas for an included welding route.

• Selected flow: Carbon dioxide 27f41c1c-535e-4d2a-bce9-2c7f4de11549
• Flow property / unit: Mass / kg
• Amount rule: cylinder mass withdrawal or supplier delivery less closing inventory attributable to the included welding route
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg net conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_fabrication_gases
• Sources:

Waste flows

Elementary flows

Outputs

Product flows

Waste flows

Post-industrial steel scrap (mf_post_industrial_steel_scrap)

Record segregated carbon-steel offcuts, chips, and rejected metal pieces leaving fabrication for recovery or treatment.

• Selected flow: Post-industrial steel scrap c143745d-be4f-4d8f-b403-2dcbfe685349
• Flow property / unit: Mass / kg
• Amount rule: measured outgoing mass by lot and destination
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg net conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_fabrication_scrap
• Sources:

Aluminium scrap (mf_aluminium_scrap)

Record segregated aluminium offcuts, chips, and rejected metal pieces leaving fabrication for recovery or treatment.

• Selected flow: Aluminium Scrap 96c5f842-ea53-419b-b1cd-c02c479efb45
• Flow property / unit: Mass / kg
• Amount rule: measured outgoing mass by lot and destination
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg net conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_fabrication_scrap
• Sources:

Elementary flows

Process: Metal surface preparation and powder coating (surface_preparation_and_powder_coating)

Inputs

Product flows

Process water for surface preparation and rinsing (sf_process_water)

Record water crossing the process boundary for aqueous cleaning, bath make-up, and rinsing in the included finishing route.

• Selected flow: Process Water 94a04f7e-2d5c-41f0-b182-d54a3b373a02
• Flow property / unit: Mass / kg
• Amount rule: metered or batch-record water supplied to the included finishing line
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg net conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_finishing_inputs
• Sources:

Sodium hydroxide for alkaline cleaning (sf_sodium_hydroxide)

Record sodium hydroxide product only when used in the declared aqueous alkaline cleaning or bath-control recipe; report solution concentration separately.

• Selected flow: Sodium hydroxide e0abcced-0611-4c24-9290-5a2c5a0c4169
• Flow property / unit: Mass / kg
• Amount rule: active sodium-hydroxide mass from purchase, make-up, and concentration records attributable to included production
• Value mode: Calculated value (calculated_value)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg net conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_finishing_inputs
• Sources:

Powder coating (sf_powder_coating)

Record powder coating consumed by the included coating line; declare resin chemistry, colour, and reclaimed-powder practice.

• Selected flow: Powder Coating 0c581697-0eed-4b86-a070-b94966eb7344
• Flow property / unit: Mass / kg
• Amount rule: opening inventory plus receipts minus closing inventory and separately measured recoverable return
• Value mode: Calculated value (calculated_value)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg net conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_finishing_inputs
• Sources:

Finishing electricity (sf_electricity)

Record electricity for cleaning-line pumps, ventilation, powder application, curing, and directly associated treatment equipment.

• Selected flow: Electricity 890a70b7-b677-4e2a-8a1b-7d017e0a10ae
• Flow property / unit: Net calorific value / MJ
• Amount rule: submetered electricity or documented allocation from a facility meter to the finishing line
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg net conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_process_energy
• Sources:

Waste flows

Elementary flows

Outputs

Product flows

Waste flows

Surface-treatment wastewater (sf_surface_treatment_wastewater)

Record the aqueous waste stream transferred from cleaning, rinsing, and bath maintenance before or after onsite treatment, with the transfer point and chemistry declared. No exact Tiangong UUID is confirmed.

• Selected flow: Surface-treatment wastewater
• Flow property / unit: Mass / kg
• Amount rule: measured discharge or transfer mass attributable to included finishing production
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg net conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_finishing_outputs
• Sources:

Metal-hydroxide treatment sludge (sf_metal_hydroxide_sludge)

Record dewatered metal-hydroxide sludge only when onsite treatment of surface-treatment wastewater produces it; declare dry-solids fraction and hazardous classification. No exact Tiangong UUID is confirmed.

• Selected flow: Metal-hydroxide treatment sludge
• Flow property / unit: Mass / kg
• Amount rule: measured wet mass transferred offsite, accompanied by measured or laboratory dry-solids fraction
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg net conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_finishing_outputs
• Sources:

Powder-coating waste (sf_powder_coating_waste)

Record unreclaimed overspray, booth-cleaning residue, and rejected powder coating that leaves as one segregated powder-coating waste stream.

• Selected flow: Powder coating waste 9aa53a82-5462-400e-9096-efab7718201f
• Flow property / unit: Mass / kg
• Amount rule: measured outgoing waste mass attributable to included finishing production
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg net conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_finishing_outputs
• Sources:

Elementary flows

Process: Final assembly, adjustment, and release testing (final_assembly_and_testing)

Inputs

Product flows

Purchased ABS plastic component (as_abs_component)

Record a purchased, ready-to-assemble ABS component only when it appears in the declared bill of materials. Primary-form ABS granulates are not substitutes for this component identity, and no exact Tiangong UUID is confirmed.

• Selected flow: Purchased ABS plastic component
• Flow property / unit: Mass / kg
• Amount rule: received component mass issued to conforming product lots, net of separately documented returns
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg net conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_assembly_materials
• Sources:

Laminated medium-density fibreboard worktop (as_laminated_mdf_worktop)

Record a purchased laminated MDF worktop only for drafting-table variants that contain it. No exact Tiangong UUID is confirmed.

• Selected flow: Laminated medium-density fibreboard worktop
• Flow property / unit: Mass / kg
• Amount rule: received component mass issued to conforming product lots, net of separately documented returns
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg net conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_assembly_materials
• Sources:

Assembly and testing electricity (as_electricity)

Record electricity consumed by assembly tools, adjustment equipment, release-test equipment, lighting allocated to the line, and directly associated extraction.

• Selected flow: Electricity 890a70b7-b677-4e2a-8a1b-7d017e0a10ae
• Flow property / unit: Net calorific value / MJ
• Amount rule: submetered electricity or documented allocation from a facility meter to assembly and testing
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg net conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_process_energy
• Sources:

Waste flows

Elementary flows

Outputs

Product flows

Conforming finished product (as_finished_product)

Record only product that passes the declared release inspection; rejected units remain in rework or are inventoried through their specific material waste streams when discarded.

• Selected flow: Drafting tables and machines, and other drawing, marking-out or mathematical calculating instruments c1e54809-bd7b-4f5b-bc54-8ef236a2889b
• Flow property / unit: Mass / kg
• Amount rule: calibrated net mass of conforming released product, excluding dispatch packaging
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: 1 kg net conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_finished_product
• Sources:

Waste flows

Elementary flows

Process: Dispatch packaging (packaging)

Inputs

Product flows

Corrugated-board boxes (pk_corrugated_board_boxes)

Record corrugated-board boxes delivered with the finished product at the factory gate.

• Selected flow: corrugated board boxes 4f197bec-7b3b-11dd-ad8b-0800200c9a66
• Flow property / unit: Mass / kg
• Amount rule: measured box mass multiplied by boxes consumed for the conforming output lot, adjusted for returned unused boxes
• Value mode: Calculated value (calculated_value)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg net conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_packaging_materials
• Sources:

Low-density polyethylene film (pk_ldpe_film)

Record PE-LD film delivered as wrapping or protective packaging with the finished product.

• Selected flow: Low-density polyethylene foil (PE-LD) 2cecd3a7-d90e-44b4-aec5-1d9dfb907477
• Flow property / unit: Mass / kg
• Amount rule: measured roll withdrawal attributable to the conforming output lot, net of returned unused film
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg net conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_packaging_materials
• Sources:

Packaging electricity (pk_electricity)

Record electricity consumed by wrapping, sealing, strapping, labelling, and directly associated packing-line equipment.

• Selected flow: Electricity 890a70b7-b677-4e2a-8a1b-7d017e0a10ae
• Flow property / unit: Net calorific value / MJ
• Amount rule: submetered electricity or documented allocation from a facility meter to dispatch packaging
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg net conforming finished product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_process_energy
• Sources:

Waste flows

Elementary flows

Outputs

Product flows

Waste flows

Elementary flows

7. Allocation and Co-product Handling

rule_id	Applies to	Rule	source_ids
al_subdivision_first	shared processes and meters	First subdivide by production line, equipment, batch, or measured operating time wherever physically separable.	eu-jrc-ilcd-handbook-lca-detailed-guidance-2010
al_shared_burdens	residual shared electricity, water, treatment, and packaging burdens	After subdivision, allocate residual shared burdens by a documented causal driver such as machine time, metered throughput, treated surface area, or number of packed units; use mass only when no better causal driver is available and disclose the sensitivity.	eu-jrc-ilcd-handbook-lca-detailed-guidance-2010
al_scrap_and_rework	scrap, rejects, and rework	Return rework burdens to the production lot that generated them. Record scrap at the measured factory-gate waste transfer; do not subtract an avoided-primary-material credit inside this attributional foreground inventory.	eu-jrc-ilcd-handbook-lca-detailed-guidance-2010

8. Foreground Data Collection, Calculation, and Quality Rules

Data Collection Protocols

protocol_id	process_id	flow_role	record_type	raw_fields	collection_method	unit	frequency	temporal_coverage	site_scope	aggregation_rule	quality_evidence
cp_fabrication_materials	metal_component_fabrication	steel and aluminium stock inputs	receiving, stock issue, and return records	material identity; grade; stock form; lot; opening mass; receipts; returns; closing mass	reconcile calibrated scale records with inventory movements and the bill of materials	kg	each lot, aggregated monthly	representative consecutive 12 months or full shorter campaign	all onsite fabrication lines serving the product	net issued mass divided by conforming net product mass	scale calibration; material certificates; stock reconciliation
cp_process_energy	all included processes	electricity	submeter or facility energy record	meter id; opening and closing reading; original unit; process operating time; allocation driver	read submeters; otherwise allocate a reconciled facility meter using documented operating data	kWh and MJ	monthly or each campaign	same period as production denominator	all included equipment and directly associated services	convert kWh to MJ, allocate, then divide by conforming net product mass	meter calibration or invoice reconciliation; allocation worksheet
cp_fabrication_gases	metal_component_fabrication	industrial oxygen and carbon-dioxide shielding gas	gas meter, cylinder, and purchase record	gas identity; purity; opening inventory; receipts; closing inventory; returned cylinders; reference temperature and pressure	reconcile metered or cylinder withdrawal with supplier records	m3 or kg	each cylinder or monthly meter reading	same period as included cutting or welding route	all included gas-consuming equipment	net consumption attributable to product divided by conforming net product mass	supplier specification; cylinder log; meter check
cp_fabrication_scrap	metal_component_fabrication	segregated steel and aluminium scrap	waste scale ticket and internal scrap log	waste identity; alloy family; gross, tare, and net mass; lot; destination	weigh each outgoing segregated stream and reconcile with material balance	kg	each transfer	same period as fabrication inputs	all included fabrication lines	summed net mass by material divided by conforming net product mass	scale ticket; waste transfer record; material-balance reconciliation
cp_finishing_inputs	surface_preparation_and_powder_coating	water, sodium hydroxide, and powder coating	meter, purchase, bath, and inventory records	material identity; concentration; opening inventory; receipts; closing inventory; water reading; reclaimed powder	reconcile meters and inventories; calculate active chemical mass from solution mass and measured concentration	kg	each batch and monthly	same period as included finishing output	all included onsite finishing lines	net input or calculated active mass divided by conforming net product mass	meter check; concentration test; purchase and inventory reconciliation
cp_finishing_outputs	surface_preparation_and_powder_coating	wastewater, metal-hydroxide sludge, and powder-coating waste	discharge meter, treatment log, laboratory result, and waste ticket	stream identity; transfer point; wet mass; dry-solids fraction; chemistry; hazardous status; destination	meter wastewater and weigh each outgoing waste; retain representative analyses	kg	each discharge or transfer	same period as included finishing inputs	all included finishing and treatment equipment	summed measured mass by atomic stream divided by conforming net product mass	laboratory report; meter record; waste transfer document; water balance
cp_assembly_materials	final_assembly_and_testing	purchased ABS component and laminated MDF worktop	bill of materials, receiving, issue, and return records	component identity; composition; supplier; lot; unit mass; quantity issued; returns	verify unit mass and reconcile issued quantities to conforming lots	kg	each product lot	representative consecutive 12 months or full shorter campaign	all assembly lines serving the product	net issued component mass divided by conforming net product mass	approved bill of materials; supplier specification; scale check
cp_finished_product	final_assembly_and_testing	conforming finished product	calibrated weighing and release record	model; serial or lot; gross mass; packaging tare; net mass; test result; reject or rework status	weigh released output or verify component roll-up, then exclude dispatch packaging	kg	each lot	same period as all inventory numerators	all product variants included in the dataset	sum conforming net mass; normalize inventory to 1 kg	scale calibration; signed release record; mass roll-up reconciliation
cp_packaging_materials	packaging	corrugated-board box and PE-LD film	packaging issue, unit-mass, roll, and return records	packaging identity; specification; unit mass; quantity issued; roll opening and closing mass; returns	weigh representative units and reconcile issue or roll withdrawal to packed lots	kg	each lot, aggregated monthly	same period as packed conforming output	all dispatch packing stations serving the product	net consumed mass divided by conforming net product mass	packaging specification; scale check; inventory reconciliation

Calculation Rules

rule_id	Applies to	Formula or rule	Inputs	Output	source_ids
calc_reference_normalization	every inventory row	normalized amount = attributable row amount / conforming net finished-product mass	row numerator; as_finished_product net mass	amount per 1 kg reference product
calc_electricity_conversion	electricity rows	electricity (MJ) = metered electricity (kWh) × 3.6 before normalization	reconciled kWh; process allocation driver; net product mass	MJ per 1 kg reference product
calc_active_sodium_hydroxide	sf_sodium_hydroxide	active NaOH mass = solution mass × measured NaOH mass fraction	solution mass; laboratory or supplier concentration	kg active NaOH per 1 kg reference product
calc_packaging_box_mass	pk_corrugated_board_boxes	box mass = verified unit mass × boxes consumed minus returned-unused-box mass	unit mass; issued count; return mass	kg boxes per 1 kg reference product
calc_material_balance	fabrication and finishing	reconcile each material input to incorporated mass, same-material scrap, inventory change, and documented loss without combining different materials or waste streams	material-specific input; output; scrap; inventory change	material-specific closure percentage and discrepancy

Data Quality Requirements

requirement_id	Applies to	Requirement	Evidence
dq_identity	all product and waste rows	Preserve the atomic flow identity, product or waste state, composition or grade, supplier, geography, and Tiangong UUID status; do not substitute a broader flow silently.	supplier specification, direct-read UUID identity, bill of materials, waste profile
dq_temporal	all foreground records	Use a representative consecutive 12-month period; a shorter campaign is allowed only when it covers the complete production campaign and seasonality is not material.	dated meter, inventory, production, and transfer records
dq_completeness	all included processes	Reconcile input, product, scrap, wastewater, and inventory-change records; explain material discrepancies and any omitted route.	material and water balances; route checklist; reconciliation worksheet
dq_measurement	measured quantities	Use calibrated or verified meters and scales, retain original units, and document every conversion and shared-meter allocation.	calibration certificates; meter logs; invoices; calculation workbook
dq_representativeness	upstream links	Match geography, technology, product state, material grade, electricity grid, and waste destination; disclose each proxy and its expected influence.	supplier data; dataset metadata; proxy justification
dq_range_status	all important flows	Until independent boundary-compatible ranges are reviewed, use foreground values without source-backed default substitution and flag unusual values through mass, water, and energy reconciliation.	foreground records and unresolved range-evidence register

9. Validation Rules

rule_id	Applies to	Rule	source_ids
val_reference_identity	reference flow	Confirm UUID, Mass property, kg unit, exact product variant qualifiers, and equality between the reference amount and normalized as_finished_product.	un-cpc-3-0-structure-2025
val_process_routes	process map and inventory	Confirm every required process is present, every conditional process states whether its condition applies, and absent routes do not carry non-zero exchanges.	us-epa-municipal-pretreatment-1993; eu-jrc-surface-treatment-metals-plastics-2006
val_atomic_inventory	all inventory rows	Confirm every row contains one physical, chemical, waste, or energy exchange; UUID-empty rows must match the manifest unresolved register exactly.
val_mass_and_water_balance	fabrication and finishing	Check material-specific mass closure and the finishing water balance; investigate and document discrepancies before release.	us-epa-municipal-pretreatment-1993
val_energy_and_units	electricity and gas rows	Confirm kWh-to-MJ conversion, gas reference conditions, original-unit retention, and reconciliation to meters or supplier records.
val_allocation_disclosure	shared processes	Confirm subdivision was attempted first and every residual allocation driver, denominator, and sensitivity is documented.	eu-jrc-ilcd-handbook-lca-detailed-guidance-2010
val_bilingual_and_uuid	published data package	Confirm UUID-bearing Chinese displays use the exact Tiangong Chinese baseName and that product state, property, unit group, geography, technology, and generalComment reviews remain compatible.

10. Published Dataset Profile

Field	Value
dataset_role	secondary_dataset or background_dataset derived from a verified foreground data package
downstream_use	Attributional process datasets and lifecycle models for products within the declared variant, route, geography, technology, and reporting-period scope
allowed_use	Use as a factory-gate product dataset when the consumer matches the required qualifiers and includes compatible upstream datasets and waste-treatment links
excluded_use	Do not use as a service-life functional comparison, for excluded product categories, or as a substitute for materially different product mass, bill of materials, finishing route, geography, or technology
required_metadata	canonical PCR id; product model and function; net product mass; principal materials and purchased components; included processes; finishing route; packaging; geography; technology; reporting period; allocation; UUIDs and unresolved identities; upstream links
required_quality_disclosure	primary-data share; meter and scale verification; temporal coverage; mass, water, and energy reconciliation; allocation drivers; proxy datasets; waste destinations; unresolved UUID and range-evidence needs
update_trigger	material product redesign; principal-material or component change; new or removed onsite process; coating-chemistry change; supplier or grid change; waste-treatment change; production relocation; or foreground data older than the declared representativeness period

11. Data Sources

Source id	Type	Reference	Used for
un-cpc-3-0-structure-2025	official_guidance	United Nations Statistics Division, CPC Version 3.0 Structure, 30 June 2025, https://unstats.un.org/unsd/classifications/Econ/Download/In%20Text/CPC_Ver_3.0_Structure_30Jun2025.csv (retrieved 2026-09-07)	Product-category identity and exclusions from adjacent CPC subclasses
hk-csd-merchandise-trade-july-2007	dataset	Census and Statistics Department, Hong Kong SAR, External Merchandise Trade, July 2007, https://www.statistics.gov.hk/pub/B10200032007MM07B0700.pdf (retrieved 2026-09-07)	Verified professional Chinese terminology for the product-category title
us-epa-municipal-pretreatment-1993	official_guidance	U.S. EPA, Guides to Pollution Prevention: Municipal Pretreatment Programs, EPA/625/R-93/006, https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=30004M80.TXT (retrieved 2026-09-07)	Metal fabrication, cleaning, coating, machining, and wastewater process decomposition
eu-jrc-surface-treatment-metals-plastics-2006	official_guidance	European Commission Joint Research Centre, Surface Treatment of Metals and Plastics BREF, adopted August 2006, https://bureau-industrial-transformation.jrc.ec.europa.eu/reference/surface-treatment-metals-and-plastics (retrieved 2026-09-07)	Conditional aqueous chemical and electrolytic surface-treatment boundary
eu-jrc-ilcd-handbook-lca-detailed-guidance-2010	official_guidance	European Commission Joint Research Centre, International Reference Life Cycle Data System (ILCD) Handbook — General guide for Life Cycle Assessment — Detailed guidance, EUR 24708 EN, 2010, https://publications.jrc.ec.europa.eu/repository/handle/JRC48157 (retrieved 2026-09-07)	System-boundary, inventory, reporting, allocation, and review framework