Key principles.
PP standard
PP standard living hinge material. Best fatigue resistance.
0.3-0.5 mm
Critical thickness for proper flex.
1-2 mm
Effective hinge length 1-2 mm.
Smooth flow
Smooth material flow into hinge zone critical.
Activates
First flex aligns molecules. Always perform after molding.
1M+ cycles
Properly designed PP hinges 10M+ cycles tested.
FAQ
PP unique fatigue resistance. Other plastics fail much earlier in flex.
>10M cycles for properly designed PP hinge. Tested standard.
First flex orients molecules. Required after molding for full performance.
Gating away from hinge. Smooth material flow. Avoid sharp transitions.
Snap-shut packaging, ammunition cases, medical device cases, fishing tackle.
Some PE grades. Minimal compared to PP. PP almost always preferred.
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