Six Fabric Tests Before a Roll Is Cut - and Why Each One Exists

Every test on our inspection frame exists because we once skipped it and paid for the container. This is the list, in the order a roll meets it, with the failure each one prevents.

1. Weight (GSM)

Tool: circular GSM cutter and balance. Pass: within +/- 5% of spec. Catches: mills substituting lighter yarn or fewer picks. "600D" from two mills can differ by 40 gsm; the lighter one wears through at the base corners first.

2. Colour in a D65 cabinet

Tool: light cabinet at D65 (daylight), also checked under TL84 (store) and A (incandescent). Pass: within shade band A/B of the sealed lab dip. Catches: shade drift between dye lots, and metamerism - two fabrics that match under shop lights and clash outdoors. Every roll, not a sample per lot, because dye lots split.

3. Rubbing fastness (crockmeter)

Tool: crockmeter, dry and wet. Pass: grade 4+ dry, 3-4+ wet (ISO 105-X12). Catches: dye that transfers to clothing. Dark linings and PU leather trims are the usual offenders; indigo denim is tested with fixing.

4. Coating adhesion and defects

Tool: inspection frame at 100 m per roll, tape peel on coating. Pass: coating does not lift; defects logged per 100 m under the 4-point system, max 20 points. Catches: PU or PVC that peels after a season, plus weaving faults, oil marks and holes that would otherwise be cut into panels.

5. Hydrostatic head

Tool: hydrostatic head tester. Pass: as specified - 1,000 mm standard PU, 2,000 mm outdoor, > 5,000 mm TPU. Catches: coatings applied too thin. Run on pre-production samples and on every TPU lot.

6. Abrasion, tensile and tear

Tool: Martindale abrasion tester; tensile/tear tester. Pass: Martindale 15,000+ for 600D polyester, 50,000+ for 1000D nylon; tensile and tear to spec. Catches: base fabrics that will not survive the bag's life. Run on pre-production samples and any new mill.

What we add by market

• GCC / hot climates: light-fastness (ISO 105-B02) grade 5+, perspiration fastness, 50 C conditioning.
• EU retail: REACH screening, phthalate test on PVC, cold-flex at -10 C.
• US: CPSIA lead and phthalate, Prop 65.
• Recycled: GRS transaction certificate reconciled to roll numbers.

After the fabric

Fabric tests stop fabric problems. Seam, zipper, handle and load failures are caught on the finished bag - the six-gate, fourteen-test bag QC process at our sister factory covers those, from cutting-room checks to a 100% final inspection before packing.

Every roll we ship carries its test record. Ask for it with your first order; you should never have to take a fabric supplier's word for a number that a machine can print.