UHMWPE examples of tribological properties

Shrinkage, coefficient of thermal expansion, crystallinity and creep are rather high, but alterations through moisture exposure are slight. 

Poisson s ratio depends on numerous parameters concerning the grade used and its processing, the temperature, the possible reinforcements, the direction of testing with regard to the molecular or reinforcement orientation. For a given HDPE sample it is evaluated at 0.46, but this is an example only that cannot be generalized. 

These results relate to a few grades only and cannot be generalized. 

The dynamic fatigue can be fair or good for certain grades if care is taken to limit the strains by restricting the stresses to values in keeping with the low modulus. 

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