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Needle penetration force measures the resistance a sewing needle faces when entering polyester fabric, helping identify heat, damage and sewability risks.

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

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

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.