Opacity is a major buying factor for leggings, uniforms, sportswear and lightweight garments. A fabric can look opaque on the roll but become more transparent when stretched or exposed to strong backlighting.
What Is Opacity?
Opacity describes how well a fabric blocks visible light. The opposite property is light transmission.
What Controls Polyester Opacity?
- GSM and thickness
- Yarn denier and filament count
- Knit or weave density
- Colour depth
- Stretch level
- Surface texture and finish
Why Stretch Changes the Result
When a knit stretches, loops open and the distance between yarns increases. This can allow more light through even if the unstretched fabric appears fully covered.
Buyer Testing
Check fabric over a standard contrasting background, under controlled lighting and at the expected garment stretch. Instrumental light-transmission testing gives a more objective comparison.
Common Mistake
Do not approve opacity only by holding fabric up in normal room light. Different lighting and stretch can reveal problems that are invisible during a quick visual check.
Final Takeaway
Opacity is a construction-and-use property, not just a GSM number. Buyers should test the fabric in the same stretch and lighting conditions the garment will face.
Need Help Choosing Polyester Fabric?
Share your garment type, GSM, DIA / width, colour, quantity and end use with Walrus – Yes India Can. We can help shortlist suitable polyester fabrics for bulk production.
Call / WhatsApp: +91 90472 77722 / +91 90420 77722
Website: yesindiacan.in
