A soft handle or smooth surface can help you choose a fabric, but it cannot prove what the fabric contains. Finishes can change the feel, and blended yarns can be difficult to identify by appearance. A reliable purchasing decision connects the specification to the actual material being supplied.
1. Check the paperwork and sample identity
Ask for a written composition declaration, including percentages, together with the fabric code and supplier or batch reference. Keep a labelled reference swatch. The description on a quotation, the sample submitted for approval and the material used in production should refer to the same agreed specification.
If a test report is provided, check the sample description, date, testing method and laboratory details. A report for a different fabric or an old reference sample does not establish the composition of a new delivery. Ask how the tested sample relates to your order.
2. Use physical observations as screening
Handle, luster, surface appearance and stretch are useful observations. They can help flag an unexpected change between samples, but none of them is a stand-alone composition test. For example, a soft regenerated cellulosic fabric and a finished cotton fabric may feel similar.
Burning behavior is sometimes used by trained personnel as part of preliminary fiber identification. It has important limits: dyes, finishes and blends can affect observations, and it cannot establish accurate blend percentages. We do not recommend open-flame tests as a buyer’s home inspection method or deliberately smelling fumes. Keep an unaltered sample for professional analysis instead.
3. Use a suitable laboratory method when it matters
For a composition requirement that affects purchasing or product claims, arrange appropriate analysis with a qualified textile laboratory. Explain the declared blend and what needs to be verified. AATCC TM20 addresses qualitative fiber identification, while TM20A addresses quantitative fiber analysis; the laboratory should select methods suited to the sample.
Ask for results tied to a traceable sample and agree what happens if the result differs from the purchase specification. Do not treat an informal screening result as a substitute for the agreed analysis.
Composition is only one part of quality
Colorfastness, shrinkage, pilling and stretch recovery answer different questions. A fabric may meet the stated composition and still fail the garment’s performance requirements. Put these requirements into a separate test plan with agreed methods and acceptance criteria.
- Keep the approved swatch and its reference code.
- Record the declared composition and intended use.
- Confirm which material the test report represents.
- Use laboratory verification where a claim or order specification requires it.
Method references: AATCC TM20: Fiber Analysis, Qualitative; AATCC test methods and standards.