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Yarn-to-yarn friction is the resistance between polyester yarns where they contact each other, influencing stability, slippage, drape and hand feel.

Thermal conductivity helps explain why two polyester fabrics with similar GSM can feel different in warmth or coolness because structure, thickness and air content change heat flow.

Pressure glazing is the shiny, flattened appearance that can develop when polyester fabric is exposed to excessive heat and pressure during pressing or calendaring.

Fabric friction coefficient describes how easily polyester slides against another surface, affecting cutting stability, sewing feed and garment behaviour.

Edge-to-centre shade variation can make one polyester roll look different across its width, creating panel mismatch after cutting and sewing.

Seam elongation measures how much a sewn seam can extend before restriction or failure, especially important in stretch polyester garments.

Thickness can vary along or across a polyester fabric roll due to knitting, finishing, pressure and tension differences. Buyers should sample multiple points.

Yarn crimp contraction explains how textured polyester yarn develops bulk, stretch and recovery after relaxation or heat, changing fabric feel and performance.

Flex fatigue describes damage that develops when polyester fabric, coatings or laminated structures are bent repeatedly during use.