Oxford fabric Specification: What Each Number Actually Changes

Buyers lose money on oxford fabric in a predictable way: they specify one figure tightly and leave the rest to the supplier. This is a walk through every figure that changes the outcome, in the order it matters.

Why the headline number is the least useful one

Every quotation leads with denier. It is easy to compare and it is the number the factory can hit most cheaply. But it tells you almost nothing on its own: denier sets the frame, and the parameters below set whether the product survives its first year in service. A buyer who compares only the headline figure is buying a sample, not a supply agreement.

For Oxford, the practical rule is to fix the headline figure at the level your product needs and then spend your negotiating attention on coating weight and hydrostatic head. Those two are where cheap goods differ from adequate goods, and they are usually absent from the quotation sheet.

The numbers that decide performance

Read the table as a set of trade-offs rather than a checklist. Moving any single line usually costs money somewhere else, and the cheapest way to hit one figure is often to let another slip.

Denier

Typical range: 210D / 420D / 600D / 840D / 1680D. Yarn size. It sets tear strength and hand far more than coating does.

Coating type

Typical range: PU / PVC / PE / none. PU is soft and breathable-ish; PVC is cheaper and stiffer; PE is for disposable goods.

Coating weight

Typical range: 15-60 gsm per pass. Two light passes beat one heavy pass for flex durability.

Hydrostatic head

Typical range: 800-5000 mm. Water resistance. 800 mm is shower-proof, 3000 mm handles sustained rain.

Base weight

Typical range: 90-260 gsm before coating. Price driver and freight driver. Buyers often compare coated weight and get misled.

How to write a Oxford specification that protects you

A specification is only useful if a substitution becomes visible. That means writing the construction and the performance together, and naming the test that proves each one. For Oxford, the clause has to pin coating weight and hydrostatic head, because those two separate a compliant lot from an adequate one:

600D polyester oxford, 2-pass PU coating with primer, 1500 mm hydrostatic head, 155 cm usable, 62 gsm total coating, tear >= 25 N, Pantone 19-4052 TCX, hydrolysis-resistant

Note what is missing from that line: adjectives. No ‘high quality’, no ‘premium’, no ‘export grade’. Every clause is either a number with a tolerance or a named test. If a supplier cannot quote against a line written this way, that is information about the supplier.

Where the specification usually breaks down

The first failure is coating peeling. The PU film lifts at folds and along stitch lines within a season. The cause is usually under-cured coating, too heavy a single pass, or no primer on the base fabric. The test that exposes it before you order: ISO 2411 peel strength plus a 5000-cycle flex test at the fold.

The second is hydrolysis in storage. New rolls smell acidic and the coating turns tacky after a few months in a hot warehouse. It comes from moisture plus heat attacks the pu; common with cheap polyester-based pu in tropical ports. Test with 70 C / 95 % RH for 7 days, then re-test adhesion and hand. and write the result into the purchase order, not just the enquiry.

Both failures share a pattern: they appear months after delivery, they are hard to attribute, and the cost lands on the buyer rather than the mill. That is exactly why the test belongs in the specification and the report belongs in the shipment file.

What to put in a Oxford enquiry

1. End use and the conditions, which together decide where coating weight has to sit inside 15-60 gsm per pass.
2. The one figure that must hold, with hydrostatic head named as the proof.
3. Quantity per colour and per delivery, against a typical MOQ of 500-1000 m per colour.
4. Destination market, because compliance changes the construction, not just the paperwork.
5. A physical standard viewed under a stated light source, not a screen proof.

With those five points we can quote against a real requirement instead of a generic range. Full ranges sit on the Oxford page, and the manufacturing side of the same question is on our quality control page.

Questions buyers ask before ordering

Is 600D always stronger than 420D?

Only if the yarn is genuinely 600D and the weave is tight. Cheap 600D with loose picks tears below a good 420D. Ask for the tear test, not the denier figure.

Can you print on oxford?

Yes, sublimation on white base or pigment print on coated goods. Pigment print on dark shades needs a white base layer or the colour goes muddy.

What hydrostatic head do I need for outdoor covers?

1500 mm handles rain, 3000 mm handles pooling water and pressure washing. Below 800 mm is shower-proof only.

Failure modes worth a clause in the purchase order

Claims rarely come from a batch that was obviously wrong. They come from a usable width figure that sat inside the quoted band and outside what the product needed.

The other two, with acceptance numbers attached, are in the full failure analysis for Oxford. A supplier who cannot name the mode he sees most often is describing a catalogue, not a process.

Seven lines that turn a quotation into a specification

Most post-delivery arguments are not about quality. They are about a document that never said which figure would be measured, on which instrument, at whose cost.

1. Colour fastness to light: the figure you will accept inside the >= grade 4 blue scale band, the tolerance on it, and the method used to measure it.
2. Denier (210D / 420D / 600D / 840D / 1680D): name the number, not the word. If the answer only repeats the band, ask which point inside it is being offered for this order.
3. Coating type: PU / PVC / PE / none is the market band. Fix the figure you will test at goods-in, and the instrument you will test it with.
4. Coating weight (15-60 gsm per pass): fix the value per shipment, and state who pays for the re-test if a lot lands outside it.
5. Price validity: the period during which the quoted figure holds, and what happens to it when the raw-material index moves.
6. Remedy: rework, replacement or credit, and the point at which each applies.
7. Sample retention: one production sample per lot stays with the mill for twelve months. Claims are settled against it, not against memory.

Related reading

• Coating type in Oxford fabric
• Oxford for Promotional bags
• Coating weight in Oxford fabric