Separate base cloth from finished fabric
Base-fabric weight describes the uncoated fiberglass cloth. Finished weight includes the coated construction. Do not treat them as interchangeable values or quote a base weight as a complete finished-fabric specification.
- Note weave, yarn, base weight and thickness where known.
- Record whether coating is applied to one or both faces.
- Confirm finished weight and thickness on the approved sample or specification.
Balance coating level with fabrication
More coating can change coverage and surface character, but it can also increase weight and stiffness. Check bending, sewing, folding, abrasion and any sealing need in the actual product geometry.
- Compare sample panels under the intended fabrication process.
- Use a specified test method for any performance comparison.
- Agree tolerances and inspection methods before production.
The buyer's comparison checklist
Ask suppliers to identify the same set of parameters so quotations can be compared fairly.
- Base fabric grade and weave
- Base weight and finished weight
- Coating chemistry and number of coated sides
- Thickness and agreed tolerance
- Width, roll length and color
- Test method, sample scope and report
Frequently asked questions
Can I compare two fabrics using gsm alone?
No. Ask for the base-fabric weight and weave, the coating type and sides, finished weight, thickness, tolerances and relevant tests.
Should I request a sample?
A sample can help verify surface feel, flexibility, color and suitability for cutting or sewing. Approve the sample and its specification before production.