Wool Moisture Regain: Why Suit Cloth Weight Can Feel Different from the Ticket
The ticket is often a commercial weight, not the cloth’s weight in your studio air. ASTM D1909 tables list commercial moisture regains and allowances for textile fibers. ASTM states those values are purely defined for commercial purposes, not experimentally determined equilibrium regains; actual equilibrium regain can deviate. They are used for commercial weight when fibre is bought or sold, for yarn linear-density calculations, and for quantitative blend analysis. Separately, the Yarn conditioning overview commonly lists wool moisture regain in the 13–18% range. That is why a wool suit cloth can feel heavier or lighter than the mill ticket depending on humidity — without anyone having “changed” the cloth.
What is the difference between commercial regain and what you feel in the hand?
| Concept | What the source says | Buyer takeaway |
|---|---|---|
| ASTM D1909 commercial regain | Defined for commercial purposes; not experimental equilibrium | Ticket weight may use a convention, not your room’s humidity |
| Actual equilibrium regain | Can deviate from the commercial table | Hand-feel weight can differ from the ticket |
| Commercial uses named by ASTM | Fibre buy/sell weight; yarn linear density; blend analysis | Ask which use the mill’s ticket follows |
| Wool regain range (Yarn conditioning overview) | Commonly listed 13–18% | Expect wool to carry substantial moisture vs dry weight |
Do not treat a commercial-regain table as a measured humidity reading for your cutting room. If your boutique needs a conditioned weight, write the conditioning method and the target separately from the commercial ticket.
What should a buyer write when GSM disagreements appear?
- Mill ticket weight and whether it is commercial weight under a named regain convention
- Your own conditioned weight method (if you run one) and the atmosphere used
- Cloth lot / piece number for both figures
- Construction intent (fused / half canvas / full canvas) so interlining weight is not confused with shell GSM
GSM measurement methods (for example ASTM D3776) are a different topic; this post is about moisture regain affecting how weight is defined and felt.
How does this affect sample and bulk?
Seal the sample against the cloth lot and the weight basis you and the mill agreed. Sample takes 7–14 days; production 14–21 days after approval. Re-weighing bulk cloth in a different climate without restating the basis creates false “short weight” disputes.
"MTM from 1 and bulk OEM from 50 after a 7–14 day sample. Agree the cloth weight basis (commercial ticket vs conditioned weight) before the sample is sealed, so bulk lots are judged the same way." — Shi Yuan Suit Factory (statement built from published factory policy)
FAQ
What moisture regain range is commonly listed for wool?
The Yarn conditioning overview commonly lists wool moisture regain in the 13–18% range.
Are ASTM D1909 regain values measured equilibrium values?
No. ASTM states the commercial moisture regains/allowances are purely defined for commercial purposes and are not experimentally determined equilibrium values; actual equilibrium can deviate.
When should weight-basis agreement reach Shi Yuan?
With the cloth brief, before the 7–14 day sample, so bulk OEM from 50 is judged on the same basis as the sealed lot.
Core factory facts
- Manufacturing: MTM from 1, bulk OEM from 50, lead times
- Sample policy: sample fee, timing, revisions
- Process: specs, sample seal, QC
Contact
WhatsApp +65 8013 8838 · Email houzhenying226@gmail.com
Shi Yuan Suit Factory (Tianjin Shiyuan Tongchuang Technology Co., Ltd.) · Est. 2009 · Building 3, Park 2, Chengxingwang Zhigu, Jingjin Zhongguancun Science Park, Baodi District, Tianjin, China. Acumenwear.com is our English export site.
