Parts of goods of subclass 48313

1. Scope and Applicability

This PCR applies to separately supplied parts of frames and mountings for spectacles, goggles, or similar eyewear. The part must be identifiable by its function in a frame or mounting, such as a temple, bridge, rim component, end piece, nose-pad arm, hinge component, or other unfinished or finished frame/mounting component. The official CPC 3.0 structure establishes the parent goods and the parts relationship (un-cpc-3-0-structure-2025).

The PCR covers gate-to-gate manufacture from purchased, specification-controlled material stock and consumables through forming, machining, joining when performed, cleaning, surface finishing when performed, inspection, and packaging at the manufacturing site. Material production, purchased component production, electricity generation, water supply, and off-site treatment remain upstream or downstream linked datasets.

Complete frames or mountings, complete spectacles or goggles, ophthalmic lenses, nose pads supplied as general rubber or plastics articles without a declared frame-part function, retail cases, repair services, and production equipment are excluded. A foreground data package for a material or technology not represented by an inventory card shall add its actual exchange as a new concrete atomic row; it shall not substitute an umbrella material or utility row.

2. Product Category Identity

Field	Value
canonical_pcr_id	pcr.metal-products-machinery-and-equipment.medical-appliances-precision-and-optical-instruments-watches-and-clocks.parts-of-goods-of-subclass-48313
classification_refs	CPC 3.0: 48352, Parts of goods of subclass 48313
covered_products	Separately supplied components whose declared function is in a frame or mounting for spectacles, goggles, or similar eyewear
excluded_products	Complete frames or mountings; complete spectacles or goggles; optical lenses; cases; repair services; undifferentiated material stock
representative_product	A conforming finished temple, bridge, rim component, end piece, nose-pad arm, hinge component, or another declared frame/mounting part
production_route	Forming or machining of specification-controlled polymer or metal stock, with route-specific cleaning, joining, polishing, coating, inspection, and packaging
market_state	Finished or semi-finished, separately supplied frame/mounting part at the factory gate; net product mass excludes packaging

3. Reference Flow

Field	Value
What	Provide conforming parts that perform the declared structural, connecting, positioning, or wearing function in a frame or mounting for spectacles, goggles, or similar eyewear
How much	1 kg net mass of conforming finished parts at the factory gate
How well	Meets the declared drawing, dimensions and tolerances, material and grade, surface finish, coating specification when applicable, and inspection acceptance criteria
How long or cycle	One completed manufacturing lot; service life is not asserted and shall be declared only in a downstream assembled-product study
reference_flow_link	The output row finished_frame_part is the quantitative reference and equals 1 kg

Field	Value
Reference amount	1 kg net mass
Reference product flow	Parts of frames and mountings for spectacles or goggles
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	part type and frame function; material family, composition and grade; finished or semi-finished state; drawing or specification identifier; dimensions and tolerances; surface finish and coating; joining route; net mass and mass-determination method; manufacturing geography and technology; lot and time period; packaging inclusion status

When constructing a foreground data package, every required qualifier shall be declared in dataset metadata, process notes, the reference-flow comment, the product description, or an equivalent field. A missing qualifier makes the reference-flow definition incomplete.

4. Measurement and Unit Rules

rule_id	Applies to	Required property	Required unit	Rule
reference_net_mass	finished_frame_part	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Determine the net mass of accepted finished parts after all included finishing steps and before packaging; exclude boxes, separators, pallets, fixtures, and rejected parts.
count_to_mass	Product and packaging records reported by item count	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Convert counts using a contemporaneous, documented average mass from a representative weighed sample for the same part or packaging specification; retain counts, sample size, weighing result, and conversion.
electricity_energy	electricity	Net calorific value 93a60a56-a3c8-11da-a746-0800200b9a66	MJ	Preserve metered kWh and convert to MJ using exactly 3.6 MJ per kWh; disclose the meter boundary and any allocation from a shared meter.
water_mass	process_water and finishing_wastewater	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Prefer direct mass records; when volume is measured, convert with measured density at the recorded condition or a documented water-density assumption and retain the original volume.
mass_normalization	Every mass-based inventory row	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg per kg reference flow	Normalize the lot quantity to 1 kg of accepted finished_frame_part; do not include the mass of rejects or packaging in the denominator.

5. System Boundary

Boundary Abstraction

Field	Value
declared_starting_condition	Purchased material stock, purchased components, chemicals, water, electricity, and packaging at the manufacturing-site receiving boundary, each identified by composition or specification and supply state
starting_condition_role	Foreground entry condition; upstream production and delivery are represented by linked datasets rather than repeated inside the foreground process
product_classification_scope	Parts of CPC 48313 frames and mountings; complete frames, complete eyewear, lenses, and unrelated generic articles are outside the product output scope
recursive_input_rule	A purchased part in the same product category that is incorporated into the output shall be recorded as its own concrete product input with supplier identity and an upstream dataset; it shall not be merged with the reference product or recursively re-manufactured in this foreground model
upstream_dataset_requirement	Link every purchased product input and energy input to a geography-, technology-, composition-, and supply-state-representative upstream dataset; disclose proxies and unmatched material grades
disclosure	Declare the part type, bill of materials, material grades, purchased-component content, included operations, surface-treatment and coating routes, site utilities, air and wastewater controls, scrap destinations, packaging, geography, technology, lot period, and any shared-facility allocation

rule_id	Applies to	Rule	source_ids
sb_product_scope	Product output identity	The reference output shall be a separately supplied part of a frame or mounting, not a complete frame, complete spectacles or goggles, or an optical lens.	un-cpc-3-0-structure-2025
sb_gate_to_gate	Foreground manufacturing boundary	Include all on-site forming, machining, joining, cleaning, polishing, surface finishing, inspection, rework, internal material handling, utility use, direct releases, waste generation, and packaging performed for the declared production lot.
sb_upstream_links	Purchased inputs	Exclude production of purchased materials, components, chemicals, electricity, water, and packaging from the foreground process and connect them through representative upstream datasets.
sb_direct_releases	Direct emissions and wastes	Record direct air emissions, aqueous waste, segregated offcuts, metal scrap, and rejected parts before off-site treatment; do not replace direct exchanges with an upstream electricity emission profile.
sb_capital_goods	Infrastructure and tooling	Exclude buildings, durable machinery, dies, moulds, and reusable fixtures unless the study goal explicitly includes them and separately reports the inclusion.

6. Process Inventory Structure

Process Map

process_id	process_name	inclusion	inclusion_condition	role	quantitative_reference
frame_part_manufacturing	Frame or mounting part manufacture	required	Always include operations performed from received stock through an unpacked conforming part; route-specific flow cards apply only when their named material or operation is used	Foreground forming, machining, cleaning, joining, polishing, and finishing	kg unpacked conforming part transferred to inspection and packaging
inspection_packaging	Final inspection and packaging	required	Always include final acceptance, recorded rework disposition, and packaging at the reporting site	Foreground product release and factory-gate packaging	1 kg accepted finished part output

Process: Frame or mounting part manufacture (frame_part_manufacturing)

Inputs

Product flows

Cellulose acetate sheet stock (cellulose_acetate_sheet)

Record this exchange only for a route that cuts or machines cellulose acetate sheet into the declared frame or mounting part. Material composition, plasticizer system, colour, thickness, supplier, and recycled content shall be retained.

• Selected flow: Cellulose acetate sheet
• Flow property / unit: Mass / kg
• Amount rule: Net issued mass minus verified returns of unchanged sheet stock
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted finished_frame_part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_material_stock

Stainless-steel wire stock (stainless_steel_wire)

Record this exchange only when the declared part is formed or machined from stainless-steel wire. Retain alloy grade, diameter, temper, supplier, and recycled-content claim; do not substitute non-alloy or low-alloy steel wire.

• Selected flow: Stainless-steel wire
• Flow property / unit: Mass / kg
• Amount rule: Net issued mass minus verified returns of unchanged wire stock
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted finished_frame_part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_material_stock

Purchased electricity (electricity)

Record electricity delivered across the manufacturing meter boundary for forming, machining, joining, cleaning, polishing, finishing, ventilation, and attributable support equipment. Upstream electricity emissions are not direct elementary outputs of this process.

• Selected flow: Electricity 890a70b7-b677-4e2a-8a1b-7d017e0a10ae
• Flow property / unit: Net calorific value / MJ
• Amount rule: Metered electricity attributable to the production lot, converted according to electricity_energy
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted finished_frame_part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_electricity

Process water (process_water)

Record process water only when it crosses the manufacturing boundary for cleaning, rinsing, cooling, polishing, or bath make-up. Closed-loop recirculation is not repeatedly counted; only make-up water crosses the boundary.

• Selected flow: Process Water 94a04f7e-2d5c-41f0-b182-d54a3b373a02
• Flow property / unit: Mass / kg
• Amount rule: Measured make-up water attributable to the production lot
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted finished_frame_part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_water

Sodium hydroxide for alkaline cleaning (sodium_hydroxide)

Record sodium hydroxide only when it is introduced to an alkaline cleaning or surface-treatment bath used for the declared part. Retain product concentration and calculate dry sodium-hydroxide mass from solution mass and concentration.

• Selected flow: Sodium hydroxide e0abcced-0611-4c24-9290-5a2c5a0c4169
• Flow property / unit: Mass / kg
• Amount rule: Dry sodium-hydroxide mass in bath make-up and replenishment attributable to the lot
• Value mode: Calculated value (calculated_value)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg accepted finished_frame_part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_bath_chemicals

Acrylic varnish coating (acrylic_varnish)

Record acrylic varnish only for parts coated with that specific product family. Retain formulation, non-volatile fraction, application and curing route, colour when relevant, supplier, and returned or recovered varnish.

• Selected flow: Acrylic varnish 56a0ef1c-80ef-4e0c-b690-c8aefb4c7e8e
• Flow property / unit: Mass / kg
• Amount rule: Net varnish issued to the coating operation after verified returns
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg accepted finished_frame_part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_coating_material

Waste flows

Elementary flows

Outputs

Product flows

Unpacked conforming frame or mounting part (unpacked_frame_part_output)

Record the net mass of conforming parts transferred from manufacturing to final inspection and packaging. This is an internal foreground transfer and shall equal the corresponding input to inspection_packaging after any documented transfer loss.

• Selected flow: Unpacked conforming frame or mounting part
• Flow property / unit: Mass / kg
• Amount rule: Measured net mass transferred to final inspection and packaging
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted finished_frame_part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_production_transfer

Waste flows

Cellulose acetate offcuts (cellulose_acetate_offcuts)

Record clean or contaminated cellulose acetate offcuts separately when the cellulose acetate route is used. Do not combine them with metal scrap, rejects, wastewater, or packaging waste.

• Selected flow: Cellulose acetate offcuts
• Flow property / unit: Mass / kg
• Amount rule: Measured offcut mass leaving the foreground manufacturing process
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted finished_frame_part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_waste_measurements

Stainless-steel manufacturing scrap (stainless_steel_scrap)

Record grade-segregated stainless-steel scrap when the stainless-steel route is used. Retain the alloy grade, contamination state, internal reuse quantity, and destination; do not mix this row with other metal scrap.

• Selected flow: Stainless-steel manufacturing scrap
• Flow property / unit: Mass / kg
• Amount rule: Measured stainless-steel scrap leaving the foreground process after deducting verified internal reuse
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted finished_frame_part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_waste_measurements

Metal-finishing wastewater with suspended solids (finishing_wastewater)

Record this aqueous waste only when cleaning, rinsing, polishing, or metal finishing creates a wastewater stream that crosses the site boundary or enters on-site treatment. Retain water mass, suspended-solids concentration, dissolved-metal data when applicable, treatment route, and discharge or transfer point.

• Selected flow: Metal-finishing wastewater with suspended solids
• Flow property / unit: Mass / kg
• Amount rule: Measured wastewater mass transferred to on-site or off-site treatment
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg accepted finished_frame_part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_wastewater

Elementary flows

Non-methane volatile organic compounds to air (nmvoc_to_air)

Record direct NMVOC released from acrylic-varnish application and curing only when that route is used. Use site measurements or the documented solvent mass-balance calculation; exclude upstream electricity and coating-production emissions.

• Selected flow: non-methane volatile organic compounds 08a91e70-3ddc-11dd-a302-0050c2490048
• Flow property / unit: Mass / kg
• Amount rule: Direct NMVOC mass released to air, calculated from collected site measurements or coating records
• Value mode: Calculated value (calculated_value)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg accepted finished_frame_part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_air_emissions

PM2.5 to air (pm25_to_air)

Record direct PM2.5 released from cutting, machining, or polishing only when those operations generate a measured or calculated release after abatement. Retain material composition, release point, control equipment, and measurement basis.

• Selected flow: particles (PM2.5) 08a91e70-3ddc-11dd-9293-0050c2490048
• Flow property / unit: Mass / kg
• Amount rule: Direct PM2.5 mass released to air after abatement, calculated from collected measurements
• Value mode: Calculated value (calculated_value)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg accepted finished_frame_part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_air_emissions

Process: Final inspection and packaging (inspection_packaging)

Inputs

Product flows

Unpacked conforming frame or mounting part (unpacked_frame_part_input)

Record the net mass received from frame_part_manufacturing. This internal transfer shall match unpacked_frame_part_output after any separately documented transfer loss.

• Selected flow: Unpacked conforming frame or mounting part
• Flow property / unit: Mass / kg
• Amount rule: Measured net mass entering final inspection and packaging
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted finished_frame_part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_production_transfer

Corrugated board boxes (corrugated_board_boxes)

Record corrugated board boxes that leave the factory with the reference product. Retain box grade, recycled content, dimensions, supplier, number of reuses if applicable, and measured or sampled mass.

• Selected flow: corrugated board boxes 4f197bec-7b3b-11dd-ad8b-0800200c9a66
• Flow property / unit: Mass / kg
• Amount rule: Measured or count-converted mass of corrugated board boxes shipped with the lot
• Value mode: Calculated value (calculated_value)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted finished_frame_part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_packaging

Waste flows

Elementary flows

Outputs

Product flows

Finished frame or mounting part (finished_frame_part)

This is the reference product leaving the factory gate after final acceptance. The product flow UUID remains unresolved because the audited public candidates represent complete frames or complete spectacles rather than component parts.

• Selected flow: Parts of frames and mountings for spectacles or goggles
• Flow property / unit: Mass / kg
• Amount rule: Exactly 1 kg net mass of accepted finished parts for the normalized dataset
• Value mode: Calculated value (calculated_value)
• Specificity: Generic (generic)
• Normalization basis: 1 kg accepted finished frame or mounting part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_finished_product

Waste flows

Rejected frame or mounting part (rejected_frame_part)

Record parts rejected at final inspection that leave the foreground process for recycling, treatment, or disposal. Reworked parts returned to manufacturing are internal transfers and are not counted again as waste unless finally rejected.

• Selected flow: Rejected frame or mounting part
• Flow property / unit: Mass / kg
• Amount rule: Measured net mass of finally rejected parts leaving the foreground process
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted finished_frame_part
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_rejects

Elementary flows

7. Allocation and Co-product Handling

rule_id	Applies to	Rule	source_ids
allocation_avoid	Shared and multi-output operations	Avoid allocation by separately metering product-specific forming, finishing, inspection, rework, waste, and packaging operations whenever practicable.
allocation_causal	Unavoidable shared utility or process records	Use a documented physical driver that reflects causality, in this order when applicable: machine time and rated or measured demand, treated surface area, bath throughput, inspected count with verified part mass, then net accepted product mass.
allocation_scrap	Offcuts and metal scrap	Report scrap as a waste output at the point it leaves the foreground boundary. Do not subtract revenue or an avoided primary-material credit inside this gate-to-gate dataset; any recycling substitution belongs to the consistent downstream system model.
allocation_rework	Rework loops	Assign measured rework inputs and wastes to the lot that generated the nonconformity; do not count internally reworked mass as a second product output.
allocation_documentation	Every allocated row	Retain the shared total, allocation population, driver values, formula, resulting factor, and reconciliation to the original record.

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_material_stock	frame_part_manufacturing	cellulose_acetate_sheet; stainless_steel_wire	purchase, issue, return, and stock records	material identity; composition or grade; supplier; lot; opening stock; receipts; issues; unchanged returns; closing stock; mass	Reconcile lot-specific issues and returns to stock movement and production orders	kg	Each issue and lot close	Complete reporting lot and reconciliation period	All production lines making the declared part	Net consumed mass = issues minus unchanged returns, reconciled to stock; normalize by accepted product mass	invoices; material certificates; calibrated scale records; signed stock reconciliation
cp_electricity	frame_part_manufacturing	electricity	electricity meter and production-hour records	meter id; opening and closing reading; kWh; time; production order; shared loads; allocation driver	Read dedicated meters or allocate a reconciled shared meter with the declared causal driver	kWh and MJ	At least each shift and lot close	Complete lot plus shared-meter reconciliation period	Included manufacturing operations and attributable support equipment	Subtract documented non-production loads, allocate shared use, convert kWh to MJ, normalize by accepted mass	meter calibration; bills; reading logs; allocation worksheet
cp_water	frame_part_manufacturing	process_water	water meter, tank, or batch-make-up records	meter or vessel id; volume or mass; density basis; operation; lot; recirculation; make-up quantity	Measure only make-up water crossing the boundary; reconcile to bath and rinse records	kg or m3	Each batch or daily, plus lot close	Complete reporting lot	Included cleaning, rinsing, cooling, polishing, and bath make-up	Convert volume to mass when needed, allocate shared use, normalize by accepted mass	meter or vessel calibration; batch sheets; density record; reconciliation
cp_bath_chemicals	frame_part_manufacturing	sodium_hydroxide	bath make-up, analysis, replenishment, issue, and return records	product identity; solution mass; concentration; bath id; make-up; replenishment; return; lot	Reconcile issued solution to bath records and calculate dry chemical mass	kg solution and mass fraction	Every make-up and replenishment	Complete bath campaigns overlapping the reporting lot	Baths used for the declared part	Dry NaOH mass = net solution mass multiplied by measured or supplier concentration; allocate by bath throughput when shared	supplier certificate; concentration test; calibrated scale; bath log
cp_coating_material	frame_part_manufacturing	acrylic_varnish	coating issue, return, formulation, and application records	product identity; batch; issued mass; returned mass; non-volatile fraction; application route; coated part lot	Weigh issued and returned varnish and reconcile to coating operation	kg	Each coating batch	Complete coating batches for the reporting lot	Coating lines used for the declared part	Net varnish input = issued minus verified unchanged return; normalize by accepted mass	supplier specification; scale calibration; batch sheet; issue-return reconciliation
cp_production_transfer	frame_part_manufacturing; inspection_packaging	unpacked_frame_part_output; unpacked_frame_part_input	production-order transfer records	part id; lot; accepted status at transfer; count; sampled average mass or direct mass; sending and receiving timestamps	Weigh the transfer directly or use count-to-mass conversion under count_to_mass; reconcile both processes	kg	Each transfer	Complete reporting lot	Manufacturing and inspection/packaging boundary	Sum transferred net mass and reconcile sending and receiving records	calibrated scale; sample record; signed transfer record; discrepancy investigation
cp_waste_measurements	frame_part_manufacturing	cellulose_acetate_offcuts; stainless_steel_scrap	segregated waste container and transfer records	waste identity; material or grade; contamination; container tare and gross mass; internal reuse; destination; lot	Weigh each segregated stream before it leaves the foreground process	kg	Each container transfer	Complete reporting lot	All included manufacturing operations	Sum net waste mass by atomic stream after deducting verified internal reuse; normalize by accepted mass	scale calibration; photos or labels; transfer notes; recycler receipt
cp_wastewater	frame_part_manufacturing	finishing_wastewater	tank, discharge, and transfer records	source operation; volume or mass; density; suspended solids; dissolved metals when applicable; treatment route; destination; date; lot	Measure wastewater crossing to on-site treatment, sewer, or off-site transfer without double counting recirculation	kg and concentration units	Each discharge or transfer	Complete reporting lot and overlapping bath campaign	Included wet operations	Convert to mass, allocate shared tanks by documented throughput, normalize by accepted mass	meter or tank calibration; laboratory results; manifest or discharge record; mass-balance reconciliation
cp_air_emissions	frame_part_manufacturing	nmvoc_to_air; pm25_to_air	stack or workplace exhaust tests and operation records, or documented material balance	pollutant; concentration; gas flow; duration; coating input and solvent fraction; capture and abatement efficiency; operating hours; lot	Prefer representative measured concentration and gas flow; use a documented coating or particulate mass balance only when measurement is unavailable	kg pollutant	Each representative test and every lot calculation	Tests representative of the reporting technology and full lot operating hours	All release points attributable to the declared part	Calculate pollutant mass by calc_air_emissions, reconcile controls and bypasses, normalize by accepted mass	laboratory report; instrument calibration; operating log; control-equipment records; calculation worksheet
cp_packaging	inspection_packaging	corrugated_board_boxes	packaging issue and shipment records	box specification; supplier; count; sampled or direct mass; reused count; lot	Weigh boxes or apply count_to_mass for the same box specification	kg	Each packaging lot	Complete reporting lot	Final packaging operation	Sum boxes shipped with the product, adjust documented reuse allocation, normalize by accepted mass	purchase record; box specification; calibrated scale; sample worksheet
cp_finished_product	inspection_packaging	finished_frame_part	final inspection and shipping release records	part id; lot; accepted count; net mass; specification; packaging tare; release status	Weigh accepted parts before packaging or use validated count-to-mass conversion	kg	Each released lot	Complete reporting lot	Final acceptance boundary	Sum accepted net product mass; set normalized reference output to exactly 1 kg	calibrated scale; acceptance record; sample worksheet; shipping release
cp_rejects	inspection_packaging	rejected_frame_part	inspection disposition and waste transfer records	part id; lot; reject reason; count; net mass; rework status; destination	Weigh finally rejected parts and reconcile reworked quantities to production records	kg	Each disposition and lot close	Complete reporting lot	Final inspection and any linked rework area	Sum final reject mass only; exclude successful rework; normalize by accepted mass	inspection record; scale calibration; rework reconciliation; transfer note

Calculation Rules

rule_id	Applies to	Formula or rule	Inputs	Output	source_ids
calc_normalize_mass	Every lot-level inventory amount	normalized amount = attributable lot amount / accepted net mass of finished_frame_part	attributable lot amount; accepted net product mass	kg, MJ, or pollutant kg per 1 kg reference flow
calc_electricity_mj	electricity	electricity MJ = metered electricity kWh × 3.6; then apply the documented shared-meter allocation before normalization	kWh; allocation driver and factor; accepted net product mass	MJ per 1 kg reference flow
calc_water_mass	process_water; finishing_wastewater	water-stream mass = measured volume × documented density when direct mass is unavailable	measured volume; density and condition	kg per 1 kg reference flow
calc_dry_naoh	sodium_hydroxide	dry NaOH mass = net solution mass × measured or supplier mass fraction of NaOH	issued solution mass; unchanged return; NaOH mass fraction	kg dry NaOH per 1 kg reference flow
calc_air_emissions	nmvoc_to_air; pm25_to_air	For measurement, released mass = concentration × actual exhaust volume over the operating period. For an accepted material balance, released mass = relevant material input minus mass retained in product, collected as waste, recovered, or destroyed, with every term measured or documented.	concentration; gas flow; duration; material input; retained, recovered, waste, and destroyed fractions; accepted net product mass	kg pollutant per 1 kg reference flow
calc_mass_reconciliation	Manufacturing lot	material inputs = accepted and rejected product mass + separately measured waste and direct mass releases + documented stock change, within the declared measurement uncertainty	atomic material inputs; products; wastes; mass emissions; stock change; uncertainty	reconciled mass-balance statement and unexplained difference

Data Quality Requirements

requirement_id	Applies to	Requirement	Evidence
dq_product_identity	Reference product	Identify the part's frame/mounting function and demonstrate that it is not a complete frame, complete eyewear item, or lens.	drawing or specification; bill of materials; product photograph or catalogue; final inspection record
dq_route_materials	Bill of materials	Represent every material and purchased component crossing the boundary as its own atomic exchange. Add a concrete row for any route material not represented above; never map it to an umbrella material row.	reconciled bill of materials; purchase and issue records; supplier certificates
dq_temporal	All foreground rows	Use records covering the same reporting lot or a documented representative period; disclose substitutions, shutdowns, start-up losses, rework campaigns, and shared-facility periods.	lot genealogy; dated records; representativeness statement
dq_completeness	Mass and energy inventory	Reconcile material mass, accepted output, rejects, wastes, direct mass releases, electricity, and water against source records; investigate unexplained differences beyond declared instrument and sampling uncertainty.	reconciliation worksheet; uncertainty statement; corrective-action record
dq_emission_identity	Direct air emissions	Preserve pollutant identity, receiving compartment, particle size for PM2.5, release point, measurement method, control status, and test representativeness.	test report; calibration; stack or exhaust map; operating log
dq_allocation	Shared records	Use the allocation hierarchy in section 7 and retain the original total and driver population so a reviewer can reproduce every factor.	meter total; driver records; formula; reconciliation
dq_uuid_status	UUID-bearing and unresolved rows	Use only audited state-100 Tiangong UUIDs with matching semantics, flow type, property, and unit. Keep the reference product and other unresolved identities UUID-empty until an exact public record is verified.	UUID audit record; unresolved-item register

9. Validation Rules

rule_id	Applies to	Rule	source_ids
validation_reference	Reference flow	Confirm finished_frame_part is exactly 1 kg net accepted part mass and excludes packaging, rejects, and complete frames or eyewear.
validation_qualifiers	Dataset metadata	Reject a data package that omits any required qualifier listed in section 3.
validation_atomicity	Process inventory	Confirm every exchange is one concrete product, waste, or elementary flow; reject umbrella materials, combined utilities, combined wastes, and unspecified emissions.
validation_conditions	Conditional routes	Confirm each conditional material, chemical, waste, and emission row is present when its named route occurs and absent or explicitly not applicable when that route demonstrably does not occur.
validation_internal_transfer	unpacked_frame_part_output; unpacked_frame_part_input	Reconcile the two internal-transfer amounts and explain any measured loss without counting the transfer as an external product input or output.
validation_mass_balance	Manufacturing lot	Recalculate calc_mass_reconciliation; report the unexplained difference and declared measurement uncertainty rather than forcing the balance.
validation_emissions	nmvoc_to_air; pm25_to_air	Confirm direct emissions are based on representative foreground measurements or a complete documented material balance and are not copied from upstream energy datasets.
validation_allocation	Shared process records	Reproduce each allocation from the original total, driver population, formula, and factor and confirm that allocated amounts sum to the original total.
validation_sources	Classification and external evidence	Confirm the cited official classification locator resolves to the declared CPC identities; treat all quantitative ranges as unresolved until the two-independent-source rule is met.	un-cpc-3-0-structure-2025

10. Published Dataset Profile

Field	Value
dataset_role	Gate-to-gate foreground production dataset suitable for release as a secondary_dataset or background_dataset after review
downstream_use	Assembly models for spectacles, goggles, and similar eyewear; frame or mounting production models; supply-chain and product-footprint studies needing separately supplied component manufacture
allowed_use	Use for the declared part type, material grade, geometry, finish, technology, geography, and factory-gate boundary, or for an explicitly justified representative match
excluded_use	Complete frames, complete spectacles or goggles, lenses, retail cases, repair services, dissimilar material routes without added atomic exchanges, or use-phase and end-of-life claims not modelled here
required_metadata	Canonical PCR id; product and part identifiers; frame function; material composition and grade; drawing/specification; dimensions and tolerances; finish/coating; joining route; net-mass method; bill of materials; site and geography; technology; time and lot; upstream dataset matches; allocation; waste destinations; air and wastewater controls; packaging status; unresolved UUIDs
required_quality_disclosure	Primary-record coverage; meter and scale calibration; count-to-mass sampling; mass reconciliation and uncertainty; shared-resource allocation; emission measurement or mass-balance method; data gaps; proxies; route conditions; representativeness; review status
update_trigger	Change in part function, material family or grade, geometry, forming or joining technology, surface treatment or coating, abatement, site or grid geography, packaging, allocation driver, upstream dataset match, exact Tiangong flow identity, or evidence sufficient to establish a reviewed range

11. Data Sources

Source id	Type	Reference	Used for
un-cpc-3-0-structure-2025	official_guidance	United Nations Statistics Division, CPC Ver. 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)	Official English identity for CPC 48313 and CPC 48352 and the parent-product/parts relationship