Two mills can both say “90 GSM” and mean different cloth. Greige GSM is the loom-state weight. Finished GSM is the weight after the process you are buying. Compare them only after both quotes name the stage.
Side by side
| Greige GSM | Finished GSM | |
|---|---|---|
| Cloth | Off the loom, before dye or print | After the agreed finishing route |
| Band we weave and finish | About 55–120 g/m² | About 60–140 g/m² |
| What moves the number | Yarn, pick, weave | Shrinkage, softener, brush, print, coating |
| Contract line | “90 g/m² greige, method …” | “100 g/m² finished, method …” |
| Blackout | Face cloth only, if you are buying greige | State face GSM and total GSM when there is a coating |
These bands are the usual range for our polyester home-textile programs. They are not a promise that every construction exists at every point inside the band.
How to write the line
Use one unit. We contract in g/m² and meters. If your team thinks in oz/yd², convert first, then put g/m² on the purchase order. The GSM tool does that conversion. It does not replace the lab method.
A small cutter sample follows the same idea as ISO 3801: mass divided by area. Say whether you cut greige or finished cloth. ASTM D3776 is another mass-per-area method. If the buyer lab and the mill lab disagree, compare the method and the specimen before you argue the number.
Width moves with weight
Finishing also narrows the cloth. Greige width on our looms runs 160–330 cm. Finished width is often 150–315 cm. A GSM check on a narrow finished strip does not describe the greige roll you were quoted.
Greige polyester is the page for loom-state programs. Finished routes, including peachskin, quote the GSM after brushing.