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Polyester contains both ordered crystalline regions and flexible amorphous regions. Learn how this molecular structure influences heat stability, dye diffusion, strength, shrinkage and fabric performance.

Polyester filament properties are shaped by molecular orientation created during drawing. Learn how alignment of polymer chains changes yarn strength, elongation, shrinkage and dye behaviour.

A strong polyester yarn is not automatically the most durable. Learn how elongation at break, tenacity and toughness work together to determine yarn and fabric performance.

Polyester yarn strength is better understood through tenacity, which compares breaking force relative to yarn size. Learn how tenacity, elongation and fabric structure work together to influence textile durability.