ASTM D3776 Fabric Mass: What to Write on a Suit Cloth Mill Brief
Name the method before you argue about grams. ASTM D3776 Standard Test Methods for Mass Per Unit Area (Weight) of Fabric covers fabric mass per unit area for most fabrics and defines four options: A full piece/roll/bolt/cut, B full-width sample, C small swatch, D narrow fabrics. Option A is commonly used for acceptance testing of commercial shipments. A mill brief that only says “280 g/m²” without naming D3776 and the option leaves the lab free to weigh a different specimen type than you expect.
What belongs in the mill brief?
| Brief line | What to write | Why |
|---|---|---|
| Method | ASTM D3776/D3776M (state year/reapproval) | Names mass-per-unit-area determination |
| Option | A / B / C / D | Four specimen paths; C applies to the swatch only |
| Units | g/m² or oz/yd² — one system | SI and customary are separate; do not mix |
| Conditioning | Per ASTM D1776 / standard textile atmosphere if required | Unconditioned rolls may not match conditioned results |
| Lot link | Mill lot / piece number | Ties the sealed sample cloth to the report |
Method: What to write: ASTM D3776/D3776M (state year/reapproval) · Why: Names mass-per-unit-area determination
Option: What to write: A / B / C / D · Why: Four specimen paths; C applies to the swatch only
Units: What to write: g/m² or oz/yd² — one system · Why: SI and customary are separate; do not mix
Conditioning: What to write: Per ASTM D1776 / standard textile atmosphere if required · Why: Unconditioned rolls may not match conditioned results
Lot link: What to write: Mill lot / piece number · Why: Ties the sealed sample cloth to the report
How does this connect to sample and bulk at the factory?
Shi Yuan Suit Factory does not replace the mill’s D3776 report. Attach the report to the cloth indent before the 7–14 day sample is cut. After seal, bulk from 50 (or MTM from 1 on the same cloth rules) should reference the same named method. Production 14–21 days after approval; production ≠ delivery.
"Put ASTM D3776 and the option letter on the mill brief before we cut the 7–14 day sample. Bulk OEM from 50 after seal should cite the same lot’s mass method — not a verbal ounce guess." — Shi Yuan Suit Factory (statement built from published factory policy)
FAQ
What does ASTM D3776 measure?
Fabric mass per unit area (fabric weight) for most fabrics, using one of four options (A–D) described on ASTM’s D3776 standard page.
Why name Option C carefully?
Option C uses a small laboratory swatch; results apply to that sample and not necessarily to the whole lot unless you and the mill agree otherwise.
When should the D3776 report reach Shi Yuan?
With the cloth indent, before sample cut, so the sealed sample and any bulk from 50 share the same named mass method.
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.
