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Printed polyester can develop set-off when the decorated face contacts another fabric layer before the ink or finish is sufficiently cured, dry or stable. Heat, winding pressure and long storage may make the defect appear only after the roll is opened.

Hot-knife cutting can seal loose polyester filaments at a webbing cut edge, but excessive heat may leave a stiff, glossy or brittle zone. The cut method needs to be qualified for the actual strap, not accepted on appearance alone.

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

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.

Repeated tumble drying exposes polyester fabric to heat and mechanical action that can change dimensions, surface appearance and hand feel even when the fibre itself is durable.

Seam strength depends on the fabric, thread, stitch type and construction working together, so a strong polyester fabric does not automatically guarantee a strong garment seam.

Polyester oligomers can migrate during high-temperature dyeing and accumulate on machines, creating deposits, spots and repeatability problems if cleaning and process control are weak.

Phenolic yellowing is a storage-related discolouration risk that can affect white and pale polyester garments, especially when packaging chemistry, heat and alkaline conditions interact.