ISO
ISO 7211-3 Textiles — Woven fabrics — Construction — Methods of analysis — Part 3: Determination of crimp of yarn in fabric
How much longer a yarn is than the fabric it came out of, because it bends over the yarns crossing it. Measured by straightening a removed yarn under a defined tension.
- Number
- ISO 7211-3
- Committee
- ISO/TC 38
- Status
- active
Equivalents
| Body | Number | Equivalence | Deviation |
|---|---|---|---|
| ASTM | ASTM D3883 | NEQ | Parallel standard, not an adoption of the ISO text under ISO/IEC Guide 21. Measures the same property by a comparable method; results should not be assumed interchangeable. Confirm which standard the buyer specifies. |
Verification coverage
Checked against ASTM. Not yet checked: AATCC, BIS, SAC, JIS, EN, DIN — an absent row here does not mean no equivalent exists.
What this standard is for
Where it is used
Fabric costing and construction analysis, and reverse-engineering a competitor fabric from a swatch.
Why it matters
Crimp is the difference between the yarn a mill buys and the fabric it sells. Ignore it and warp consumption is understated on every metre, which is a costing error that only appears at the end of the order.
What to watch for
Crimp differs between warp and weft, and changes with finishing. Measure on the fabric in the state being costed.
Calculators that implement this
- Fabric Contraction & Loom-state Shrinkage Tool
- Fabric GSM & Yarn Consumption Calculator
- Reed Count & Reed Width Calculator
- Warp & Weft Crimp Percentage Calculator
- Warp Yarn Requirement Tool with Waste Factor
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Metadata only — purchase the standard from the issuing body.
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