Bodies for motor vehicles

1. Scope and Applicability

This rule covers a newly manufactured, assembled motor-vehicle body (coachwork) supplied at the factory gate, before installation of the engine, powertrain, separate chassis, seats, electronics or other vehicle equipment. Record whether the delivered body is uncoated or coated; include the coating operation only for a coated body. The foreground boundary includes body-sheet forming, joining, rework, and, when performed before body release, surface preparation, coating and curing. Supplier production of purchased inputs is represented by upstream datasets. This is a body product rule, not a whole-vehicle use or end-of-life rule. The boundary follows the distinct CPC body, chassis and body-parts headings and the assembled-body description in the EDAG report. [Sources: un-cpc3-notes-2025, edag-silverado-body-lca-2018, epa-auto-ria-2004]

2. Product Category Identity

Field	Value
canonical_pcr_id	pcr.metal-products-machinery-and-equipment.transport-equipment.bodies-for-motor-vehicles
classification_refs	CPC 3.0 49210, Bodies for motor vehicles; classification context only
covered_products	Assembled new body shells or coachwork for motor vehicles, with declared coating state
excluded_products	Complete vehicles; engine-fitted chassis; loose body parts or accessories; trailers; repair or repainting services
representative_product	Assembled passenger or goods vehicle body shell at factory release
production_route	Sheet-metal forming and joining; surface preparation and coating when the delivered body is coated
market_state	One accepted finished body at factory gate, with configuration and coating state declared

3. Reference Flow

Field	Value
What	An assembled motor-vehicle body providing the declared structural and enclosure functions
How much	One accepted finished body of the declared configuration
How well	Meets the producer's documented body acceptance and dimensional criteria; declare coating state
How long or cycle	One factory release; no vehicle lifetime is asserted by this production rule
reference_flow_link	body_output

Field	Value
Reference amount	M
Reference product flow	Bodies for motor vehicles 68dcb7da-bb57-4730-94f3-ace5817da287
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	vehicle body type; model and configuration; included closures; material route; coated or uncoated state; coating system if present; factory location and reporting period; accepted net mass M

The required qualifiers belong in the foreground data package. A body-in-white and a coated body must have different declared product states; do not treat their inventories as directly equivalent. No nominal body weight is specified here. [Sources: edag-silverado-body-lca-2018]

4. Measurement and Unit Rules

rule_id	Applies to	Required property	Required unit	Rule
reference_mass	reference product	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	M = accepted net mass of one complete unit of the same configuration in kg; collect using cp_mass.
inventory_basis	all inventory rows	Exchange property in each row	row unit	Record each attributable exchange per one accepted finished unit; the reference amount is that body's measured M kg. Do not use a generic body mass.
energy_conversion	plant_electricity	Energy	kWh	Preserve metered kWh; if a downstream energy-flow unit is MJ, multiply kWh by 3.6 and disclose the conversion.

5. System Boundary

Boundary Abstraction

Field	Value
declared_starting_condition	Purchased body-grade sheet at the plant gate, plus other purchased process inputs; declare the accepted body configuration and coating state
starting_condition_role	Foreground manufacturing starts with purchased inputs; upstream manufacture remains linked by product datasets
product_classification_scope	A motor-vehicle body product under CPC 49210; chassis, body parts and complete vehicles remain separate products
recursive_input_rule	If a purchased input is itself a completed body, model its upstream body dataset once and record only additional foreground transformation; do not count its manufacture twice
upstream_dataset_requirement	Link supplier datasets for purchased sheet, electricity, coating materials, fuel and water at the declared geography and technology
disclosure	Declare supplied versus on-site formed panels, coating state, rework, scrap treatment, site, period, and any missing upstream data

rule_id	applies_to	rule	source_ids
boundary_body_only	product boundary	Stop at the released body; exclude complete-vehicle assembly, use, service and end-of-life.	un-cpc3-notes-2025; edag-silverado-body-lca-2018
boundary_coating	coated body route	Include surface preparation, coating, curing, direct wastes and attributable energy only when coating is part of the delivered body.	epa-auto-ria-2004
boundary_purchased_inputs	upstream inputs	Record purchased inputs at the foreground gate and link suitable upstream datasets; avoid double counting on-site and purchased forming.	edag-silverado-body-lca-2018

6. Process Inventory Structure

Process Map

process_id	process_name	inclusion	inclusion_condition	role	quantitative_reference
body_form_join	Sheet forming and body joining	required	Every covered body	Foreground manufacture	per one accepted finished unit
body_coating	Body preparation and coating	conditional	Delivered body is coated	Foreground finish	per one accepted finished unit
body_release	Acceptance and factory release	required	Every covered body	Reference output and mass measurement	M kg per one accepted finished unit

Internal panels and the body-in-white are work in progress within this foreground system; avoid a second outward product credit for their transfer. Forming scrap is a separate waste exchange. The EDAG report describes body sheet forming and an assembled-body boundary; the EPA report describes the subsequent coating sequence. [Sources: edag-silverado-body-lca-2018, epa-auto-ria-2004]

Process: Sheet forming and body joining (body_form_join)

Inputs

Product flows

Cold-rolled steel body sheet (steel_sheet)

Include when steel sheet is purchased for the declared body configuration. Record the actual sheet grade and received mass; its UUID awaits identity review.

• Selected flow: Cold-rolled steel body sheet
• Flow property / unit: Mass / kg
• Amount rule: Measured steel-sheet input per one accepted finished unit.
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per one accepted finished unit
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_sheet
• Sources: edag-silverado-body-lca-2018

Aluminium body sheet (aluminium_sheet)

Include only when aluminium sheet is purchased for the declared body configuration; do not infer a primary or recycled alloy route from this generic sheet identity.

• Selected flow: aluminium sheet 4f197be4-7b3b-11dd-ad8b-0800200c9a66
• Flow property / unit: Mass / kg
• Amount rule: Measured aluminium-sheet input per one accepted finished unit.
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per one accepted finished unit
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_sheet
• Sources: edag-silverado-body-lca-2018

Plant electricity for body production (plant_electricity)

Meter the electricity attributable to forming, joining and, when present, coating. The duplicate generic alternating-current candidates need identity review before a UUID can be assigned.

• Selected flow: Grid electricity, alternating current
• Flow property / unit: Energy / kWh
• Amount rule: Metered electricity attributable to one accepted finished body.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per one accepted finished unit
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_energy
• Sources: edag-silverado-body-lca-2018

Waste flows

Elementary flows

Outputs

Product flows

Waste flows

Steel sheet offcuts (steel_offcuts)

Weigh segregated steel cut-offs leaving forming and joining; distinguish them from returned reusable sheet.

• Selected flow: Steel scrap, offcuts ae44c4ac-bcd5-4a16-b0a5-d674ffeaab6b
• Flow property / unit: Mass / kg
• Amount rule: Weighed steel offcuts per one accepted finished unit.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per one accepted finished unit
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_scrap
• Sources: edag-silverado-body-lca-2018

Elementary flows

Process: Body preparation and coating (body_coating)

Inputs

Product flows

Industrial production water (process_water)

Include water entering surface preparation and rinsing only when the delivered body is coated; measure the supplied mass.

• Selected flow: Production water for industrial use 72dcdee6-846a-455a-95d1-942aa7ad3730
• Flow property / unit: Mass / kg
• Amount rule: Metered or weighed water per one accepted finished unit.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per one accepted finished unit
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_coating_materials
• Sources: epa-auto-ria-2004

Waterborne automotive basecoat (waterborne_basecoat)

Include only if the coating recipe uses a waterborne color basecoat. Record the actual supplied formulation and wet mass; the generic paint candidates are not exact identities.

• Selected flow: Waterborne automotive body basecoat
• Flow property / unit: Mass / kg
• Amount rule: Issued wet basecoat mass per one accepted finished unit.
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per one accepted finished unit
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_coating_materials
• Sources: epa-auto-ria-2004

Gaseous natural gas for curing (gaseous_natural_gas)

Include only when natural gas fires the coating oven; use the metered gas volume and disclose its supply conditions.

• Selected flow: natural gas in the gaseous state 4f19ca0e-7b3b-11dd-ad8b-0800200c9a66
• Flow property / unit: Volume / m3
• Amount rule: Metered gas volume attributable to one accepted finished body.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per one accepted finished unit
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_energy
• Sources: epa-auto-ria-2004

Waste flows

Elementary flows

Outputs

Product flows

Waste flows

Pretreatment effluent (pretreatment_effluent)

Include separately collected aqueous phosphate pretreatment effluent when the coating route generates it. Record actual treatment destination; a generic wastewater identity is insufficient.

• Selected flow: Aqueous phosphate pretreatment effluent
• Flow property / unit: Mass / kg
• Amount rule: Measured discharged effluent per one accepted finished unit.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per one accepted finished unit
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_effluent
• Sources: epa-auto-ria-2004

Elementary flows

Process: Acceptance and factory release (body_release)

Inputs

Product flows

Waste flows

Elementary flows

Outputs

Product flows

Accepted motor-vehicle body (body_output)

Release one accepted finished body of the declared configuration and coating state. Its mass M is measured, not assumed. In the measurement rules, “unit” means this one finished motor-vehicle body.

• Selected flow: Bodies for motor vehicles 68dcb7da-bb57-4730-94f3-ace5817da287
• Flow property / unit: Mass / kg
• Amount rule: M kg
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per one accepted finished unit
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_mass
• Sources: un-cpc3-notes-2025; edag-silverado-body-lca-2018

Waste flows

Elementary flows

7. Allocation and Co-product Handling

rule_id	applies_to	rule	source_ids
allocate_subdivide	shared body and vehicle operations	Subdivide body-forming, joining and coating records from downstream vehicle assembly where measured records allow.	edag-silverado-body-lca-2018
allocate_metered	shared meters and batches	Assign shared electricity, gas, water and material issues to accepted bodies using the documented meter period, line or batch counts and configuration mix; disclose the allocation key and reject untraceable assignment.	edag-silverado-body-lca-2018
allocate_scrap	recovered steel offcuts	Record steel offcuts once as waste to their actual treatment route; do not give an undocumented avoided-production credit.	edag-silverado-body-lca-2018

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_mass	body_release	accepted body mass	calibrated scale record	model; configuration; serial or batch id; coating state; accepted net mass M	Weigh the accepted complete unit on a calibrated scale, excluding transport packaging; reconcile the same configuration and acceptance record.	kg	each accepted body or traceable batch	reporting period	release gate	accepted net mass per unit	scale calibration; acceptance record
cp_sheet	body_form_join	steel or aluminium sheet input	purchase and issue records	alloy or grade; received mass; issued mass; batch; accepted body count	Reconcile issued sheet with stock change and forming records for each material separately.	kg	each batch	reporting period	body line	per one accepted finished unit	invoices; stock ledger; bill of materials
cp_energy	body_form_join	electricity or gas input	meter and fuel records	meter id; kWh; gas m3; period; line; accepted body count	Read calibrated meters and assign only the attributable body line and coating load; separate electricity and gas.	kWh or m3	each meter period	reporting period	body line and coating	per one accepted finished unit	meter calibration; utility bills; allocation worksheet
cp_scrap	body_form_join	steel offcuts	scrap weighbridge records	container id; steel grade; mass; destination; batch	Weigh segregated steel offcuts and reconcile against material issue and body output.	kg	each scrap transfer	reporting period	forming line	per one accepted finished unit	weighbridge; transfer ticket
cp_coating_materials	body_coating	water and basecoat input	meter and material issue records	water kg; coating formulation; issued wet paint kg; batch; accepted body count	Measure supplied water and separately reconcile issued basecoat against stock and returns.	kg	each batch	reporting period	paint shop	per one accepted finished unit	meter; issue log; formula sheet
cp_effluent	body_coating	pretreatment effluent	discharge meter and sample	discharged mass; pretreatment line; batch; treatment destination	Meter or weigh segregated phosphate pretreatment effluent and identify the treatment route.	kg	each discharge batch	reporting period	pretreatment line	per one accepted finished unit	discharge log; sample; treatment receipt

Calculation Rules

rule_id	Applies to	Formula or rule	Inputs	Output	source_ids
per_body_inventory	all inventory rows	Sum attributable exchange quantities in the reporting period and divide by the number of accepted bodies of the same configuration; keep each exchange in its row unit.	raw records; accepted body count; configuration; applicable collection protocol	exchange per one accepted finished unit	edag-silverado-body-lca-2018
mass_reconciliation	steel_sheet, aluminium_sheet, steel_offcuts, body_output	Reconcile material input, documented internal returns, offcuts and measured net body mass for the declared configuration; investigate any unexplained difference rather than forcing balance.	cp_sheet; cp_scrap; cp_mass	reconciliation record	edag-silverado-body-lca-2018

Data Quality Requirements

requirement_id	Applies to	Requirement	Evidence
dq_identity	reference product and all flows	Declare body configuration, coating state and the physical identity of each material, fuel and waste stream.	accepted body record; material specification; treatment ticket
dq_mass	body_output	Use calibrated net mass M for the accepted body; do not substitute whole-vehicle or packaged mass.	scale calibration; acceptance record
dq_time	all foreground records	Use a common reporting period and reconcile production counts, meters, inventories and transfers.	dated ledgers and meter reads
dq_coverage	coating route	Explain omitted coating layers, treatment chemicals, direct emissions or waste streams and collect them as separate exchanges when material.	recipe; permit; waste log; completeness check

9. Validation Rules

rule_id	applies_to	rule	source_ids
validate_reference	body_output	Confirm one accepted body with measured M kg and the same configuration and coating state across reference and inventory.	edag-silverado-body-lca-2018
validate_boundary	body versus vehicle	Reject datasets that include complete-vehicle assembly, chassis, engine or downstream use inside the body reference.	un-cpc3-notes-2025; edag-silverado-body-lca-2018
validate_conditions	conditional rows	Require route evidence for aluminium sheet, coating water, basecoat, oven gas and effluent when those rows are included; absent routes are disclosed.	edag-silverado-body-lca-2018; epa-auto-ria-2004
validate_records	all rows	Match each amount to a dated protocol record, check unit and direction, and disclose unresolved flow UUIDs and missing upstream datasets.	edag-silverado-body-lca-2018

10. Published Dataset Profile

Field	Value
dataset_role	secondary_dataset or background_dataset after review
downstream_use	Body input to a foreground vehicle assembly process or lifecyclemodel
allowed_use	Matching body type, material route, configuration, factory geography and coating state
excluded_use	Whole-vehicle reference; unqualified substitution between coated and uncoated bodies; unsupported generic industry benchmark
required_metadata	body model; configuration; material and joining route; coating state and recipe; factory; period; measured M; source and treatment routes
required_quality_disclosure	meter and mass evidence; allocation keys; supplier dataset coverage; unresolved flow identities; omitted emissions and coating chemicals
update_trigger	changed body design, material mix, coating recipe, supplier route, site technology or reporting period

11. Data Sources

Source id	Type	Reference	Used for
un-cpc3-notes-2025	official_guidance	United Nations Statistics Division, CPC Ver. 3.0 Explanatory Notes (30 June 2025), https://unstats.un.org/unsd/classifications/Econ/Download/In%20Text/CPC_Ver_3.0_Exp_Notes_30Jun2025.pdf, p. 271–272 (accessed 2026-09-27)	Body, chassis and body-part classification boundary
edag-silverado-body-lca-2018	literature	Lindita Bushi, EDAG Silverado Body Lightweighting Final LCA Report (August 2018), https://www.aluminum.org/sites/default/files/2021-10/AA-LWT-Body-Design_Final-LCA-Report_August-2018.pdf, §§ 6.2, 8.2 (accessed 2026-09-27)	Assembled-body state, sheet forming, material and scrap accounting; case method only, no empirical range
epa-auto-ria-2004	official_guidance	U.S. EPA, Regulatory Impact Analysis for the Automobile and Light Duty Vehicle NESHAP, Final Report (EPA-452/R-04-007, February 2004), https://www.epa.gov/sites/default/files/2020-07/documents/transport-mfg_ria_final-neshap_2004-02.pdf, § 2.1 (accessed 2026-09-27)	Coating sequence after body assembly, surface preparation, paint-booth water and coating inputs; no general body material quantities or allocation factors