Razors and razor blades (including razor blade blanks in strips)

1. Scope and Applicability

This PCR applies to gate-to-gate manufacture of unpackaged razors, razor cartridges, finished razor blades, and razor blade blanks supplied in strips. It covers conversion of purchased blade-grade steel strip through forming, hardening and tempering, sharpening, cleaning, optional edge coating, and, when the declared product is a complete razor or cartridge, housing manufacture and final assembly. The representative route is a martensitic stainless-steel blade with an optional PTFE low-friction coating and an optional polypropylene housing.

Upstream production of steel, polymers, chemicals, water, and electricity is represented by linked background datasets. Retail packaging, distribution after the factory gate, shaving-aid consumables, use, blade replacement, and end-of-life are excluded. Electric shavers, powered clippers, surgical blades, industrial machine knives, and separately supplied non-razor handles are excluded. A dataset using another declared alloy, coating, housing polymer, or manufacturing technology remains in scope only when every actual exchange is represented by a chemically or physically specific flow and the differing route is disclosed.

2. Product Category Identity

Field	Value
canonical_pcr_id	pcr.metal-products-machinery-and-equipment.fabricated-metal-products-except-machinery-and-equipment.razors-and-razor-blades-including-razor-blade-blanks-in-strips
classification_refs	CPC 3.0 42914, Razors and razor blades (including razor blade blanks in strips), exact contextual reference
covered_products	Unpackaged safety or shaving razors; razor cartridges; finished single-edge, double-edge, or cartridge razor blades; razor blade blanks in strips
excluded_products	Electric shavers and clippers; surgical blades; industrial cutting knives; separately supplied non-razor handles; retail packaging
representative_product	Martensitic stainless-steel razor blade or razor cartridge with declared blade count, optional PTFE edge coating, and optional polypropylene housing
production_route	Purchased blade-grade steel strip → perforating or stamping → hardening and tempering → grinding and honing → cleaning → optional coating and curing → optional housing moulding and assembly → inspection and factory-gate release
market_state	Dry, unpackaged, saleable finished razor, cartridge or blade, or saleable blade blanks in strips, at the manufacturing gate

3. Reference Flow

Field	Value
What	Manufacture of a declared razor, razor cartridge, finished razor blade, or razor blade blank in strip form
How much	1 kg net saleable unpackaged product at the factory gate
How well	Conforms to the manufacturer's released specification for the declared product form, dimensions, blade geometry, material grade, coating state, and assembly state
How long or cycle	One completed manufacturing campaign to factory-gate release; no use-life or replacement credit is included
reference_flow_link	The reference amount and product-flow object below represent the same net saleable output

Field	Value
Reference amount	1 kg
Reference product flow	Razors and razor blades (including razor blade blanks in strips) 6c5d6033-a2c9-40f0-bc7d-077549573ace
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 form; blade count where applicable; blade alloy and grade; blank, sharpened or assembled state; coating material and coating state; housing or handle inclusion and polymer; recycled content; manufacturing geography; production period; net dry mass basis; factory-gate definition

When constructing a foreground data package, every item in Required qualifiers must be declared in dataset metadata, process notes, the reference-flow comment, the product description, or an equivalent field. Missing qualifiers make the reference flow incomplete.

4. Measurement and Unit Rules

rule_id	Applies to	Required property	Required unit	Rule
reference_net_mass	reference product and normalization denominator	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Use net dry mass of saleable unpackaged product after final inspection. Exclude pallets, transport packaging, temporary carriers, and rejected product.
electricity_conversion	purchased electricity	Net calorific value 93a60a56-a3c8-11da-a746-0800200c9a66	MJ	Preserve metered electricity and convert kWh to MJ using exactly 3.6 MJ per kWh; do not mix fuel energy into this row.
solution_active_mass	sodium hydroxide and PTFE dispersions	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Report active dry substance mass. Calculate it from as-received solution or dispersion mass and batch-specific concentration; retain both raw values.
wastewater_mass	cleaning wastewater	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Prefer direct mass. A volume-to-mass conversion requires measured or supplier-supported density and must retain volume, density, temperature, and conversion evidence.

5. System Boundary

rule_id	Applies to	Rule	source_ids
sb_foreground_operations	foreground manufacturing	Include all on-site forming, heat treatment, sharpening, cleaning, optional coating and curing, optional housing moulding and assembly, inspection, rework, and directly controlled waste handling needed to produce the declared reference product.	epo-ep2454056b1-2014; uspto-us11571827b2-2023
sb_upstream_inputs	purchased inputs	Record each purchased material, chemical, water, and electricity flow crossing the site boundary and link it to an upstream dataset with matching product state, geography, technology, and recycled-content qualifiers.
sb_water_and_waste	aqueous cleaning and surface treatment	Include process-water intake, sodium-hydroxide active mass when alkaline cleaning is used, cleaning wastewater, internal recycle, and treatment destination; retain a site water mass balance.	eu-jrc-sts-bref-2020
sb_exclusions	downstream stages	Exclude retail packaging, distribution, use, replacement frequency, shaving consumables, and end-of-life unless the study explicitly expands the boundary and reports those stages separately.

Boundary Abstraction

Field	Value
declared_starting_condition	Purchased blade-grade steel strip and any declared housing or coating inputs received at the razor-product manufacturing site
starting_condition_role	Upstream product inputs to the foreground conversion and assembly process
product_classification_scope	Razors, razor cartridges, finished razor blades, and razor blade blanks in strips within CPC 3.0 42914
recursive_input_rule	A razor blade, blade blank, or cartridge from the same product category that enters this process is recorded as a separate product input with its own upstream dataset; it is not folded into the reference output or silently cut off.
upstream_dataset_requirement	Every purchased input must use a compatible upstream dataset or supplier primary record that declares product state, material grade or formulation, geography, technology, recycled content where relevant, and delivery boundary.
disclosure	Declare product form, blade alloy, coating system, housing material, included assembly components, manufacturing route, site geography, production period, excluded operations, internal recycling, and whether mass and energy records cover all included operations.

6. Process Inventory Structure

Process Map

process_id	process_name	inclusion	inclusion_condition	role	quantitative_reference
razor_product_manufacturing	Razor and razor-blade manufacture	required		Foreground conversion, finishing, optional housing moulding, assembly, inspection, and factory-gate release	1 kg net saleable unpackaged reference product

Process: Razor and razor-blade manufacture (razor_product_manufacturing)

Inputs

Product flows

Blade-grade stainless-steel strip (blade_steel_strip)

Purchased cold-rolled martensitic stainless-steel strip enters forming, heat treatment, and sharpening. The alloy grade, strip thickness, temper, supplier, and recycled content must be retained; no exact Tiangong flow UUID is currently confirmed.

• Selected flow: Martensitic stainless-steel razor-blade strip
• Flow property / unit: Mass / kg
• Amount rule: measured received mass consumed by the included production campaign, net of unchanged returned stock
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg net saleable reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_blade_steel_strip
• Sources: epo-ep2454056b1-2014

Manufacturing electricity (manufacturing_electricity)

Purchased electricity supplies forming, electric heat treatment, grinding, cleaning, coating, moulding, assembly, ventilation, and directly attributable auxiliaries. Shared meters are allocated only through the approved calculation rule.

• Selected flow: Electricity 890a70b7-b677-4e2a-8a1b-7d017e0a10ae
• Flow property / unit: Net calorific value / MJ
• Amount rule: metered purchased electricity attributable to the included campaign, converted from kWh where necessary
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg net saleable reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_manufacturing_electricity
• Sources:

Process water (process_water)

Process water crosses the boundary for aqueous cleaning, rinsing, cooling, and PTFE dispersion make-up when used. Record make-up water separately from internally recycled water.

• Selected flow: Process Water 94a04f7e-2d5c-41f0-b182-d54a3b373a02
• Flow property / unit: Mass / kg
• Amount rule: measured make-up process water supplied to the included campaign
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg net saleable reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_process_water
• Sources: eu-jrc-sts-bref-2020

Sodium hydroxide active substance (sodium_hydroxide)

Sodium hydroxide is recorded only when an alkaline cleaning bath is used. Report active NaOH mass, not the combined mass of the supplied solution.

• Selected flow: Sodium hydroxide e0abcced-0611-4c24-9290-5a2c5a0c4169
• Flow property / unit: Mass / kg
• Amount rule: as-received cleaning-solution mass multiplied by batch-specific sodium-hydroxide mass fraction
• Value mode: Calculated value (calculated_value)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg net saleable reference product; not applicable when no sodium-hydroxide cleaner is used
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_sodium_hydroxide
• Sources: eu-jrc-sts-bref-2020

PTFE resin for edge coating (ptfe_resin)

PTFE resin crosses the boundary only for a declared fluoropolymer low-friction blade-edge coating. Report dry PTFE solids and disclose the dispersion medium and coating application route.

• Selected flow: PTFE resin f1adfc87-da88-4bcb-ace7-d6b809049f56
• Flow property / unit: Mass / kg
• Amount rule: as-applied dispersion mass multiplied by batch-specific PTFE solids fraction
• Value mode: Calculated value (calculated_value)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg net saleable reference product; not applicable for products without PTFE coating
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_ptfe_resin
• Sources: epo-ep2454056b1-2014

Polypropylene for razor housing (polypropylene)

Polypropylene enters injection moulding only when it is the declared razor or cartridge housing material. Do not use this row for ABS, HIPS, nylon, elastomer, or another polymer. No exact Tiangong flow UUID is currently confirmed because the exact-name candidate carries an incompatible public classification.

• Selected flow: Polypropylene resin in primary form
• Flow property / unit: Mass / kg
• Amount rule: measured polypropylene resin charged to housing moulding, net of verified internal regrind returned within the same campaign
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg net saleable reference product; not applicable for blade-only products or non-polypropylene housings
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_polypropylene
• Sources: uspto-us11571827b2-2023

Waste flows

Elementary flows

Outputs

Product flows

Net saleable reference product (reference_product_output)

Only conforming unpackaged product released at the factory gate is reference output. Rejects, retained samples, rework awaiting release, and packaging are excluded from this mass.

• Selected flow: Razors and razor blades (including razor blade blanks in strips) 6c5d6033-a2c9-40f0-bc7d-077549573ace
• Flow property / unit: Mass / kg
• Amount rule: measured net saleable output normalized to exactly 1 kg reference product
• Value mode: Calculated value (calculated_value)
• Specificity: Product-specific (product_specific)
• Normalization basis: exactly 1 kg net saleable reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_reference_product_output
• Sources: un-cpc-3-0-structure-2025

Waste flows

Post-industrial steel scrap (postindustrial_steel_scrap)

Segregated steel offcuts, punched skeletons, trimming losses, and rejected steel parts leaving the process are recorded here. Grinding dust is excluded and has its own row.

• Selected flow: Post-industrial steel scrap c143745d-be4f-4d8f-b403-2dcbfe685349
• Flow property / unit: Mass / kg
• Amount rule: measured steel scrap leaving the campaign after deducting verified internal remelt or direct reuse
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg net saleable reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_postindustrial_steel_scrap
• Sources:

Cleaning wastewater (cleaning_wastewater)

Spent aqueous cleaning and rinsing water leaving the foreground process for treatment or discharge is recorded with treatment status and composition. Internally recycled water is not counted as an output until it leaves the boundary.

• Selected flow: Wastewater from cleaning f0402393-e82c-47e8-9cd8-a486c97f3e89
• Flow property / unit: Mass / kg
• Amount rule: measured wastewater mass leaving the included campaign, or volume converted using documented density
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg net saleable reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_cleaning_wastewater
• Sources: eu-jrc-sts-bref-2020

Captured grinding dust (grinding_dust)

Dry dust collected from blade-edge grinding, honing, and associated filtration is recorded separately from metal offcuts and wet sludge. Disclose metal and abrasive composition and treatment route.

• Selected flow: Dust from Grinding and Sieving e0f3b3af-7794-4c25-ae58-5e4302b226d2
• Flow property / unit: Mass / kg
• Amount rule: measured dry captured dust leaving the included campaign
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg net saleable reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_grinding_dust
• Sources: epo-ep2454056b1-2014

Polypropylene moulding waste (polypropylene_waste)

Segregated polypropylene runners, sprues, trim, purge, and rejected mouldings leaving the boundary are recorded only for the polypropylene housing route. Internally returned regrind is disclosed but not counted as an output.

• Selected flow: Polypropylene Wastes 88215d1b-e6b6-4ec7-af7f-83375e80637b
• Flow property / unit: Mass / kg
• Amount rule: measured polypropylene waste leaving the campaign after deducting verified internal regrind
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg net saleable reference product; not applicable for blade-only products or non-polypropylene housings
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_polypropylene_waste
• Sources: uspto-us11571827b2-2023

Elementary flows

7. Allocation and Co-product Handling

rule_id	Applies to	Rule	source_ids
allocation_subdivide	separately metered products, lines, and campaigns	Prefer subdivision and direct measurement by product form and campaign before allocating shared inputs or wastes.
allocation_shared_operations	inseparable shared electricity, water, cleaning, ventilation, and waste handling	Allocate using a documented physical driver that reflects causality, such as machine time, metered sub-load, treated surface area, bath loading, or measured mass throughput; do not default to revenue.
allocation_internal_recycling	steel scrap and polypropylene regrind returned within the same foreground system	Treat verified internal reuse as an internal loop and avoid double-counting it as both an output waste and a new input. Report losses and any material leaving the boundary.
allocation_external_recovery	scrap or waste leaving for recycling or recovery	Report the waste flow and destination at the factory gate without avoided-burden credit inside this gate-to-gate dataset; any downstream credit belongs to an explicitly declared expanded model.

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_blade_steel_strip	razor_product_manufacturing	Blade-grade stainless-steel strip	receiving, issue, and return record	lot id; supplier; alloy grade; strip thickness; received mass; issued mass; returned mass; recycled content	calibrated scale and inventory reconciliation	kg	per lot and campaign	declared representative production period covering complete campaigns	all included lines at the declared site	sum issued mass minus unchanged returned mass and normalize to released output	scale calibration; supplier certificate; lot traceability; inventory reconciliation
cp_manufacturing_electricity	razor_product_manufacturing	Manufacturing electricity	meter record	meter id; start and end readings; kWh; covered equipment; allocation driver; downtime	revenue-grade site or submeter	kWh and MJ	per billing interval and campaign where available	declared representative production period covering complete campaigns	all included equipment and auxiliaries	subtract excluded loads, allocate shared load by approved physical driver, convert kWh × 3.6, normalize to released output	meter calibration; one-line diagram; reconciliation to utility invoice
cp_process_water	razor_product_manufacturing	Process water	meter and water-balance record	source; meter id; make-up volume or mass; recycle volume; discharge volume; density if converted	calibrated water meter or tank mass balance	kg	per meter interval or campaign	declared representative production period covering complete campaigns	all included water-using operations	count boundary make-up once, reconcile intake, recycle, losses and outputs, normalize to released output	meter calibration; water mass balance; treatment log
cp_sodium_hydroxide	razor_product_manufacturing	Sodium hydroxide active substance	chemical batch and concentration record	batch id; solution mass; NaOH mass fraction; bath make-up; inventory change; disposal	calibrated scale plus certificate or verified titration	kg active NaOH	per batch	declared representative production period covering complete campaigns	included alkaline cleaning baths	sum solution mass × batch concentration, adjust for inventory change, normalize to released output	scale calibration; certificate of analysis or titration; bath log
cp_ptfe_resin	razor_product_manufacturing	PTFE resin for edge coating	coating batch record	batch id; dispersion mass; PTFE solids fraction; recovered coating; inventory change; coated product mass	calibrated scale plus formulation or certificate	kg dry PTFE	per coating batch	declared representative production period covering complete campaigns	included PTFE coating line	sum dispersion mass × verified solids fraction, subtract recovered unchanged material, normalize to released output	scale calibration; formulation; certificate of analysis; batch log
cp_polypropylene	razor_product_manufacturing	Polypropylene for razor housing	resin issue and regrind record	lot id; resin grade; virgin mass; external recycled resin mass; internal regrind charged; returned stock; housing output	calibrated hopper or platform scale	kg	per moulding batch	declared representative production period covering complete campaigns	included polypropylene moulding lines	sum externally supplied resin consumed; disclose but do not double-count internal regrind; normalize to released output	scale calibration; supplier certificate; batch genealogy
cp_reference_product_output	razor_product_manufacturing	Net saleable reference product	final release and mass record	product code; product form; blade count; alloy; coating; housing material; gross mass; packaging tare; rejected mass; released mass	calibrated scale linked to lot-release record	kg	per released lot	declared representative production period covering complete campaigns	all included final inspection and release points	sum released net unpackaged mass and normalize all exchanges to 1 kg	scale calibration; release authorization; tare verification; mass reconciliation
cp_postindustrial_steel_scrap	razor_product_manufacturing	Post-industrial steel scrap	scrap container and dispatch record	container id; alloy where known; gross mass; tare; internal reuse; destination; date	calibrated floor or dispatch scale	kg	per container or dispatch	same period as product output	all included forming, trimming, and rejection points	sum net scrap leaving the boundary, exclude internal reuse, normalize to released output	scale calibration; dispatch ticket; material segregation record
cp_cleaning_wastewater	razor_product_manufacturing	Cleaning wastewater	effluent meter and treatment record	source operation; volume or mass; density; pH; metals; oil; treatment status; destination	calibrated meter or tank mass balance with representative sampling	kg	continuous or per discharge batch	same period as product output	all included cleaning and rinsing operations	sum effluent leaving the boundary, exclude internal recycle, convert volume only with documented density, normalize to released output	meter calibration; sample chain of custody; laboratory result; water balance
cp_grinding_dust	razor_product_manufacturing	Captured grinding dust	dust collector clean-out record	collector id; gross mass; tare; moisture; metal content; abrasive content; destination	calibrated scale at each clean-out	kg dry mass	per clean-out	same period as product output	all included dry grinding and filtration systems	sum dry net dust leaving the boundary and normalize to released output	scale calibration; collector log; waste characterization; dispatch ticket
cp_polypropylene_waste	razor_product_manufacturing	Polypropylene moulding waste	scrap and regrind record	batch id; runners; sprues; purge; rejects; internal regrind; mass leaving; destination	calibrated scale and batch reconciliation	kg	per moulding batch	same period as product output	included polypropylene moulding lines	sum polypropylene waste leaving the boundary after internal regrind, normalize to released output	scale calibration; batch record; waste dispatch ticket

Calculation Rules

rule_id	Applies to	Formula or rule	Inputs	Output	source_ids
normalize_to_reference_mass	all inventory rows	normalized amount = period exchange amount / period net released unpackaged product mass × 1 kg	exchange records; cp_reference_product_output	exchange amount per 1 kg reference product
convert_electricity_kwh	manufacturing electricity	electricity MJ = metered kWh × 3.6 MJ/kWh	cp_manufacturing_electricity	MJ electricity
calculate_active_mass	sodium hydroxide and PTFE resin	active mass = as-received solution or dispersion mass × verified batch mass fraction	cp_sodium_hydroxide; cp_ptfe_resin	kg active NaOH or dry PTFE
reconcile_material_mass	steel and polypropylene	received external input = saleable product share + material in wastes leaving boundary + net inventory change + documented process loss; internal recycle appears once as an internal loop	input, output, scrap, waste, and inventory records	material-specific reconciliation and unexplained balance
reconcile_site_water	process water and cleaning wastewater	intake = wastewater leaving + water in products or wastes + evaporation and other measured losses + net system inventory change; internal recycle is disclosed but not counted twice	cp_process_water; cp_cleaning_wastewater	water mass balance and unexplained balance	eu-jrc-sts-bref-2020

Data Quality Requirements

requirement_id	Applies to	Requirement	Evidence
dq_identity_traceability	reference product and blade steel	Maintain product code, product form, blade count, alloy grade, strip lot, coating state, housing material, and released-lot linkage.	supplier certificates, batch genealogy, and release records
dq_temporal_coverage	all foreground exchanges	Cover complete campaigns within a declared representative production period and disclose seasonality, shutdowns, abnormal events, and any uncovered interval.	dated meter, inventory, batch, and dispatch records
dq_mass_completeness	steel, polymer, product, and wastes	Reconcile each material family and investigate every unexplained balance before publication; disclose the review criterion and its justification.	signed reconciliation with source records and corrective-action evidence
dq_water_management	water and wastewater	Maintain a flow diagram and site water mass balance; identify intake, internal recycle, treatment, discharge, and losses.	water audit, meter calibration, sampling records, and treatment logs
dq_conditional_routes	coating and housing rows	Mark a conditional row not applicable only when product specification and line records demonstrate that the declared coating or housing material is absent.	bill of materials, route sheet, and batch record
dq_range_status	all important flows	No external empirical amount range is normative in this candidate PCR. Preserve foreground values and flag them for review until two independent, boundary-compatible original sources or reviewed foreground datasets support a range.	manifest unresolved range-evidence record and source-review record

9. Validation Rules

rule_id	Applies to	Rule	source_ids
val_reference_identity	reference flow	Confirm the reference output UUID, Mass/kg property support, net unpackaged mass basis, and every required product qualifier.
val_atomic_inventory	inventory	Confirm every row is one atomic exchange with one direction, flow type, property, unit, amount rule, basis, evidence kind, and collection protocol; reject umbrella utilities, combined materials, and combined wastes.
val_process_coverage	foreground boundary	Confirm the dataset covers all declared on-site forming, heat treatment, sharpening, cleaning, coating, moulding, assembly, inspection, rework, and directly controlled waste handling, or explicitly marks non-applicable operations with evidence.	epo-ep2454056b1-2014; uspto-us11571827b2-2023
val_mass_balance	steel and polypropylene	Confirm material-specific reconciliations, internal recycling treatment, and destination for every material output; investigate unexplained balances over the data-quality threshold.
val_water_balance	water and wastewater	Confirm water intake, internal recycle, cleaning wastewater, treatment, discharge, and losses reconcile for the same site and period.	eu-jrc-sts-bref-2020
val_allocation	shared operations	Confirm subdivision was attempted first and every remaining allocation uses a disclosed physical driver with numerator, denominator, period, and affected products.
val_range_evidence	important flows	Confirm no unverified single-source value, repeated single value, or mechanically combined scenario minimum/maximum is presented as an empirical range.

10. Published Dataset Profile

Field	Value
dataset_role	unit_process
downstream_use	secondary_dataset; background_dataset; foreground building block for lifecyclemodel projections
allowed_use	Gate-to-gate datasets for razors, cartridges, finished razor blades, or strip blanks matching the declared product form, material, coating, housing, geography, technology, period, and factory gate
excluded_use	Electric shavers, surgical blades, industrial knives, packaged retail products, use-stage comparisons, replacement-frequency claims, and cradle-to-grave results without additional verified stages
required_metadata	PCR id; reference product UUID; product form; blade count; alloy and grade; coating; housing material; recycled content; geography; technology; production period; net mass basis; boundary; allocation; source dataset identities
required_quality_disclosure	record coverage; meter and scale calibration; supplier certificates; active-substance calculations; mass and water balances; allocation drivers; data gaps; unresolved UUID and range-evidence status; uncertainty and representativeness
update_trigger	Change in product form, reference-flow identity, alloy family, coating system, housing material, manufacturing route, site geography, allocation method, data period, background dataset, or evidence sufficient to resolve UUID or range gaps

11. Data Sources

Source id	Type	Reference	Used for
un-cpc-3-0-structure-2025	Official guidance (official_guidance)	United Nations Statistics Division, CPC Version 3.0 Structure, 30 June 2025, official CSV: https://unstats.un.org/unsd/classifications/Econ/Download/In%20Text/CPC_Ver_3.0_Structure_30Jun2025.csv (retrieved 2026-09-05)	Product classification identity and official English title for CPC 42914
epo-ep2454056b1-2014	Literature (literature)	European Patent Office, EP 2 454 056 B1, Razor Blade Technology, 19 March 2014: https://data.epo.org/publication-server/rest/v1.2/publication-dates/20140319/patents/EP2454056NWB1/document.pdf (retrieved 2026-09-05)	Stainless-steel strip, hardening, sharpening, cleaning, edge coating, PTFE application and curing, and cartridge assembly process decomposition
eu-jrc-sts-bref-2020	Official guidance (official_guidance)	European Commission Joint Research Centre, Best Available Techniques Reference Document on Surface Treatment Using Organic Solvents including Preservation of Wood and Wood Products with Chemicals, 2020: https://bureau-industrial-transformation.jrc.ec.europa.eu/sites/default/files/2021-06/jrc122816_sts_2020_final.pdf (retrieved 2026-09-05)	Aqueous cleaning, sodium-hydroxide cleaning input, water and wastewater accounting, water audits, and recycling controls
uspto-us11571827b2-2023	Literature (literature)	United States Patent US 11,571,827 B2, Shaving Razor Cartridge and Method of Manufacture, 7 February 2023: https://patents.google.com/patent/US11571827B2/en (retrieved 2026-09-05)	Injection-moulded razor-cartridge housing, polypropylene as a housing polymer option, and blade-to-housing assembly