If Oxford fails in a way that is hard to explain, base weight is the first place to look and the last place buyers check, because it is the figure everyone assumes is under control.
What base weight actually controls in Oxford
Price driver and freight driver. Buyers often compare coated weight and get misled.
The consequence is that this figure sets the floor for everything downstream: the process, the price and the failure mode all follow from it.
For Oxford fabric, the working range is 90-260 gsm before coating. Inside that band the choice is commercial; outside it, the product changes category and so does the price.
What 90-260 gsm before coating does not tell you
| Position | Value | Effect on Oxford | Where it shows up |
|---|---|---|---|
| Floor | 90 | Lowest cost, least margin for process variation | Coating peeling within a season |
| Working middle | 90-260 gsm before coating | Predictable performance at a normal price | Nothing to negotiate, nothing to explain |
| Ceiling | 260 gsm before coating | Best performance, highest cost | Cost the end product may not recover |
Buyers default to the floor because it is the cheapest compliant answer. That is rational until the first claim, and then the saving is measured against a replacement shipment.
The figure that decides the outcome is not base weight itself but the tolerance around it. A supplier who quotes 90-260 gsm before coating without a tolerance has not quoted a specification, and the first lot will define the tolerance for you.
How to measure base weight
The reference method here is Colour fastness to light, run to ISO 105-B02, with an acceptance of >= grade 4. The method is the easy part; sampling and conditioning are where reports diverge.
Condition the sample before measuring. Results in this family move by 10-20 % between a dry laboratory and a humid one, and two labs can disagree on the same material without either being wrong.
Record the measured value rather than pass or fail. A marginal pass on base weight tells you the process is running at the edge, which is the information you need before the next lot rather than after it.
Base weight does not stand alone
Base weight moves with tear strength (>= 25 N warp / >= 25 N weft (600D)) and with usable width (150-160 cm). Tightening one usually costs money in another, and a supplier who accepts every tolerance without comment has either not understood the interaction or is planning to substitute.
This is why a specification written as a list of independent tolerances is weaker than one written as a construction. The list lets a supplier satisfy each line while missing the product.
The clause to write for base weight
The line below is the version we can quote against without inventing anything. Base weight appears with a tolerance and a test, not as a standalone number.
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
A specification without a test method is a preference. It becomes a requirement when the method and the acceptance value are both named, because then a substitution is visible.
When base weight goes wrong
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 catches it: ISO 2411 peel strength plus a 5000-cycle flex test at the fold.
What to specify instead: Two-pass coating with a primer; specify adhesion >= 6 N/50 mm after flex.
The pattern is consistent: the failure appears months after delivery, is hard to attribute, and the cost lands on the buyer. That is the argument for measuring base weight on every lot rather than on the development sample.
Four questions about base weight, before you order
- What tolerance do you hold on base weight, and what did your last three lots measure against it?
- Which method do you use for colour fastness to light, and which laboratory signs the report?
- When base weight falls outside 90-260 gsm before coating, do you rework, downgrade, or ship and hope?
- Which of tear strength or usable width would you move first to hit a lower price?
The answers are more useful than a certificate, because they show whether the process is controlled or merely inspected. Full ranges for Oxford are on the product page, and the measurement regime is described on the 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.
Failure modes, and the test that catches each one
A specification only earns its keep if it names the failure it prevents. These are the two that matter for the Oxford figures on this page.
| Failure | What triggers it | Test to demand on the production lot |
|---|---|---|
| Shade variation between lots | Dye lot change without a light-source check. | Tensile strength — ASTM D5034 grab; acceptance >= 400 N warp for 600D |
| Coating peeling | Under-cured coating, too heavy a single pass, or no primer on the base fabric. | Coating adhesion — ISO 2411; acceptance >= 6 N/50 mm |
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.
From quotation to specification in seven lines
Leave the tolerance and the method out and every dispute is settled by whoever needs the goods more.
- Usable width (150-160 cm): fix the value per shipment, and state who pays for the re-test if a lot lands outside it.
- Colour fastness to light: >= grade 4 blue scale is not an answer on its own. Ask for the last three lots’ actual readings and the spread behind them.
- Denier: agree the test method with the number. Two labs, two methods, two answers, one argument.
- Coating type (PU / PVC / PE / none): state where in the band this order sits. The middle of the band is not what a tolerance is for.
- Who inspects: third-party, in-house or none, decided in advance, with the AQL level written down.
- Reference sample: the signed sample is the definition of the colour, not the photograph in the catalogue.
- Price validity: the period during which the quoted figure holds, and what happens to it when the raw-material index moves.
Need base weight specified and tested against your end use?
Send the end use, the quantity and the destination market, and we will come back with a specification that meets it, a price at your volume and the test reports that back it up. Samples are free for qualified programmes; we charge the courier only.
Related reading
- How to Test Oxford Before You Commit to a Container
- Oxford fabric Specification
- What Oxford Really Costs
Sample cut with your values on it · Neutral packing and private label · Consolidation, documents and lead times
