ISO
ISO 139 Textiles — Standard atmospheres for conditioning and testing
The atmosphere every other textile test is supposed to be run in. Textiles absorb and release moisture, so mass, strength and dimensions all move with the room.
- Number
- ISO 139
- Committee
- ISO/TC 38
- Status
- active
Equivalents
| Body | Number | Equivalence | Deviation |
|---|---|---|---|
| ASTM | ASTM D1776 | 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. The nominal conditions are close but not identical, and the tolerances differ. |
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
Referenced by nearly every physical textile test method as a precondition, and by the lab accreditation that certifies the results.
Why it matters
Two labs testing the same fabric in different atmospheres will disagree, and the disagreement looks like a quality dispute when it is a conditioning one. Most unexplained lab-to-lab variance on weight and strength traces back to here.
What to watch for
The ISO and ASTM atmospheres are not the same, so a result conditioned to one is not automatically acceptable against a specification written to the other.
Calculators that implement this
- Courses & Wales per Inch Calculator
- Fibre & Fabric Conditioning Time to Moisture Equilibrium
- ISO 139 Conditioning Time to Moisture Equilibrium
- Laboratory Sample Chain-of-Custody, Load & Turnaround
- Moisture Regain & Content Calculator
- Warp & Weft Crimp Percentage Calculator
- Warping Machine Production & Beam Capacity Calculator
- Yarn Realization Percentage Tool
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