Check textile fibre sourcing evidence from input lot to buyer claim

Three fictional waste-fibre composition assumptions produce different recycled shares of the same dry yarn fibre output. None predicts an output or establishes an approved claim.

A buyer asks whether a yarn lot can be described as 60% recycled cotton. A 60% recycled input blend is the starting point. If recycled and virgin fibres leave the run at different rates, their share in the yarn changes. Before answering, connect the lot to its production quantities, authentic documentary evidence and the wording permitted for the claim.

Reconcile one run on one basis

This fictional spinning run uses the same dry-fibre basis throughout. Assume no additives, moisture differences, opening or closing work in progress, or other material flows. The fibre-origin labels are assumed, not independently verified. The figures illustrate a physical calculation, not a certification method.

Inputs: 9.0 tonnes of recycled cotton fibre and 6.0 tonnes of virgin cotton fibre.

Outputs: 14.2 tonnes of yarn fibre and 0.8 tonnes of fibre waste.

The total reconciles: 9.0 + 6.0 = 14.2 + 0.8 = 15.0 tonnes. The recycled share of input is 9.0 ÷ 15.0 × 100 = 60%. But the waste records do not identify how much recycled fibre was lost.

Test what the unknown waste composition changes

Case 1 All waste is recycled fibre

Recycled fibre remaining in yarn: 9.0 − 0.8 = 8.2 tonnes, alongside 6.0 tonnes of virgin fibre. On this dry-fibre basis, the recycled share of yarn fibre is 8.2 ÷ 14.2 × 100 = approximately 57.75%.

Case 2 All waste is virgin fibre

All 9.0 tonnes of recycled fibre remain in the yarn, alongside 6.0 − 0.8 = 5.2 tonnes of virgin fibre. The recycled share on the same dry-fibre basis is 9.0 ÷ 14.2 × 100 = approximately 63.38%.

Case 3 Waste follows the input mix

A 60:40 waste mix removes 0.48 tonnes of recycled and 0.32 tonnes of virgin fibre. The dry yarn fibre contains 8.52 tonnes recycled and 5.68 tonnes virgin. Its recycled share is 8.52 ÷ 14.2 × 100 = 60%, only if evidence supports that loss composition.

The two extremes expose the missing physical information. They do not show a probable range or predict the actual output. They are not a certified-content range, laboratory result, chain-of-custody eligibility decision or label permission. Choosing the lower endpoint does not authorise a claim either. The proportional case cannot be selected merely because the input recipe was 60:40.

Ask for evidence that closes the gap

Ask the supplier: which production records support the recycled share remaining in this lot's dry yarn fibre after losses? For this simplified run, a physical 60% share requires 8.52 tonnes of recycled fibre in the yarn and 0.48 tonnes in the waste. A total waste weight alone cannot establish that split.

1. Define the request. Save the exact buyer wording, yarn-lot reference, shipment quantity and content basis. Confirm whether the percentage concerns yarn fibre or a later finished product.

2. Connect the quantities. Link received fibre lots to material issues, blending, yarn output and waste records. If the real run contains moisture adjustments, rework or other flows excluded here, rebuild the balance before using it.

3. Record the unresolved question. Identify the missing loss-composition evidence and who can supply it. Keep the proposed percentage pending rather than presenting the recipe as the measured output composition.

Check documents and claim wording separately

Textile Exchange distinguishes scope and transaction certificates: one covers an organisation's ability to produce certified products; the other covers specific products. Check shipment evidence separately from the supplier's scope.

Content Claim Standard 3.1 addresses volume reconciliation and material-specific loss factors in composition calculations. Ask which applicable calculation method and supported loss factors underpin the proposed claim. This physical illustration does not replace the scheme's method.

The handover needs separate answers for physical composition, authentic documentary evidence and permitted scheme wording. No environmental benefit is established.

For a wider supplier response, use the supplier questionnaire guide. Keep this calculation with the lot evidence and the unresolved question.

To discuss organising reporting inputs and evidence gaps, contact Nitium Advisory or call +919322161562. Certification decisions and specialist fibre testing sit outside this preparation aid.

Sources checked 13 October 2026. The example is fictional and provides no certification, traceability guarantee or independent assurance.