Ultra high molecular weight
polyethylene (UHMWPE), also known as high modulus polyethylene (HMPE) or high performance polyethylene (HPPE), is a
thermoplastic. It has extremely long chains, with
molecular weight numbering in the millions, usually between 2 and 6 million. The longer chain serves to transfer load more effectively to the polymer backbone by strengthening intermolecular interactions. This results in a very tough material, with the highest impact strength of any thermoplastic presently made. It is highly resistant to corrosive chemicals, with exception of oxidising acids. It has extremely low moisture absorption, very low
coefficient of friction, is self lubricating and is highly resistant to
abrasion (15 times more resistant to abrasion than
carbon steel). Its coefficient of friction is significantly lower than that of
nylon and
acetal, and is comparable to
teflon, but UHMWPE has better abrasion resistance than teflon. It is odorless, tasteless, and nontoxic.
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