Product Carbon Footprint for Pakistani Textile Mills

A footprint is counted per unit of product, and an inventory per site and year

ISO 14067 sets the requirements for quantifying and reporting the carbon footprint of a product. The result covers the greenhouse gases released across a defined life cycle, expressed as carbon dioxide equivalent per functional unit, such as one kilogram of fabric or one finished garment.

An organisation inventory answers a different question. It reports the emissions of a site or a company for a year, in tonnes of carbon dioxide equivalent, usually split into Scope 1, Scope 2 and Scope 3 under ISO 14064-1 or the GHG Protocol Corporate Standard. That total lets a mill track its own performance. It gives a buyer no figure per garment, and it can't be divided down without a model.

Because a footprint is built from activity data and emission factors, it carries uncertainty. It also depends on choices made inside the model, so the assumptions have to travel with the number.

ISO 14067 applies the life cycle method of ISO 14040 and ISO 14044 to a product

The method underneath is life cycle assessment. ISO 14040 sets the principles and framework for a study, and ISO 14044 sets the requirements and guidelines. ISO 14067 applies that method to a product carbon footprint and adds rules on system boundary, data and reporting.

The other common reference is the GHG Protocol Product Standard, formally the Product Life Cycle Accounting and Reporting Standard. Its published scope covers raw materials, manufacturing, transport, storage, use and disposal. The same page notes that comparing one product with another needs category rules. No general standard can fix every assumption.

In February 2026 GHG Protocol and ISO announced a joint working group to update and harmonise the product level standard. Until that work is finished, a reported figure is only as comparable as the method stated beside it.

A mill holds data for the middle of the life cycle and depends on others for the ends

For a garment or fabric, the stages run from fibre to disposal: fibre production, spinning, knitting or weaving, dyeing and finishing, cut-make-trim, transport, use, and end of life. A Pakistani export mill usually holds detailed data for the middle of that chain.

For a cotton garment, fibre is the stage with the largest uncertainties, and nitrogen fertiliser and irrigation energy dominate it. Published estimates for Pakistani conventional cotton fibre sit near 4 to 7 kilograms of carbon dioxide equivalent per kilogram.

Primary data carries more weight than database averages

A footprint mixes two kinds of input. Primary data is measured at the site, or taken from purchase records, for the process being modelled. Secondary data is a background value borrowed from a published life cycle inventory database.

Primary data carries more weight because it traces to a meter or an invoice. Secondary values are defensible for stages the mill does not control, provided the source and year are named. A footprint built mostly on database averages describes an average plant.

Wet processing is usually the stage a mill can fix fastest. A dye house without recycling uses roughly 100 to 200 litres of water per kilogram of fabric, and a mill with modern reuse holds that near 30 to 60 litres. Metering the process turns a secondary value into a primary one.

A first footprint needs the fuel split and the production volume

Collect activity data for a fixed period, usually twelve months, and keep the evidence behind each figure. Utility meters, fuel notes, chemical ledgers, water readings and freight documents form the base layer.

Energy has to be split by fuel. Coal, gas, diesel and grid electricity carry very different emission factors, and the split is sharper in Pakistan, where mills run captive generation during grid interruptions. Production volume is the other figure a footprint can't do without, because it converts a total into an intensity per kilogram or per garment. Water, chemical and transport records then strengthen the result for the buyer's wider reporting.

When one mill makes many products, the allocation basis changes the number

A dye house runs many orders through the same machines. Steam, water, wastewater and compressed air serve the whole plant, so one product's footprint depends on how the shared emissions are divided.

ISO 14044 sets an order of preference for allocation. Common practice is to allocate by a physical measure such as mass; others use a ratio agreed in advance. Two mills with identical operations can report different footprints for the same fabric if one allocates by mass and the other by machine time.

The cleaner route is to avoid allocation. A sub-meter on the line or dyeing vessel that serves the order removes most of the shared cost. Where that is impractical, state the allocation basis in the report and apply it consistently.

A buyer's reviewer will try to rebuild the number from the mill's records

An auditor or an importer's sustainability team will ask for the meter data, emission factors, allocation basis and system boundary. A footprint that can't be reconstructed from those records is only a claim.

The known failure patterns are reports that cover energy but omit water, and comparisons against an unnamed industry average. Selective coverage and unstated assumptions are the weak points.

When a supplier's figure feeds a buyer's own disclosure, its quality travels with it, and a verified inventory carries more weight than a proxy estimate. The difference between the two lies in the documents, and a mill has to start keeping them long before the order.

What Tti Labs supplies for footprint readiness

• ISO/IEC 17025 accreditation through the Pakistan National Accreditation Council, published as LAB-022. The scope covers textiles and apparel, leather and footwear, and chemical testing.

• A textiles and apparel laboratory that tests fibre composition, chemical content and physical performance.

• The Sustainability Center covers the supply chain side. Its published services include greenhouse gas inventory management across Scope 1, Scope 2 and Scope 3, plus emission quantification and carbon accounting.

• Multi-tier supplier mapping, due diligence and supplier environmental audits, also in the Sustainability Center's scope.

The Sustainability Center's services supply activity data a footprint is built from. Tti Labs reports results for the samples submitted and the methods performed. It does not certify a product carbon footprint, which remains the claim of the operator that publishes it.

Talk to Tti Labs about footprint data readiness. UAN 111 786 001. ISO/IEC 17025 accredited, PNAC LAB-022.