“600D oxford” tells you almost nothing. Denier describes the yarn, not the finished fabric — two 600D oxfords can differ by 3× in waterproofing and 5× in abrasion resistance. Here is how to specify the rest.
What D actually means
Denier is yarn weight per 9,000 m. Higher D means thicker yarn: 300D is light bag fabric, 600D is standard luggage, 1680D is heavy-duty tool bags. But the same 600D yarn can be woven at different densities, so pick-up count matters as much as D.
| Construction | Typical use | Weight | Abrasion |
|---|---|---|---|
| 300D | Light bags, covers | 180-220 gsm | 15,000 cycles |
| 600D | Luggage, backpacks | 250-320 gsm | 25,000-30,000 cycles |
| 900D | Heavy bags, covers | 330-400 gsm | 35,000 cycles |
| 1680D | Tool bags, motorcycle | 420-500 gsm | 50,000+ cycles |
Coating: where the money goes
| Coating | Waterproof rating | Feel | Durability |
|---|---|---|---|
| PA (acrylic) | ~1,000 mm | Soft | Low — fails after folding |
| PU | 3,000-5,000 mm | Soft, slightly tacky | Good; can hydrolyse in humid storage |
| PVC | 5,000-10,000 mm | Stiff, heavier | Excellent, but not eco-friendly |
| TPU film | 10,000 mm+ | Soft, quiet | Excellent, recyclable |
A 600D with 1,000 mm PA coating costs roughly half of the same fabric with a 10,000 mm TPU film. If your customer’s product claim is “waterproof”, the cheap option will generate returns.
Tests worth insisting on
- Hydrostatic head — the mm rating above; ask for the test method (AATCC 127 / ISO 811).
- Martindale abrasion — under 25,000 cycles is fine for a tote, not for a school backpack.
- Hydrolysis — PU coating stored in humid climates delaminates. Ask for 70°C / 95% RH for 7 days as an accelerated test.
- Tear strength — tongue tear, warp and weft; below 25 N the fabric fails at seams.
MOQ reality
1,000 m per colour is standard for coated oxford because coating runs are set up per colour. Below that, expect either a surcharge or a stock shade. See the oxford fabric range for the constructions we hold tooling for.
How the quotation is built
Oxford pricing moves with four items: yarn denier, weaving density, coating type and coating weight (grams per square metre of coating, not of fabric). A “PU coated” quote that does not state coating weight can be half the film of the sample you approved. Ask for coating weight in gsm and write it into the purchase order.
Downgrades to watch for
- Coating weight halved — same look, waterproofing drops by a third or more.
- Recycled yarn mixed in without declaration — fine if agreed, a claim risk if not.
- Lower pick count — fabric looks similar but tears at seams and sags under load.
- PA instead of PU — saves cost, fails after repeated folding at the bag base.
Every one of these is detectable with three tests on a sample: hydrostatic head, Martindale abrasion, and a fold-flex test at the seam. Insist on the numbers before you approve the bulk run.
Related guides
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