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Ultra-high-molecular-weight polyethylene (UHMWPE, UHMW) is a subset of the thermoplastic polyethylene.Also known as high-modulus polyethylene (HMPE), it has extremely long chains, with a molecular mass usually between 3.5 and 7.5 million amu. [1]
IPX UHMW is self-lubricating; and is highly resistant to abrasion. [5] Its coefficient of friction is significantly lower than that of traditional UHMW, and greatly lower than nylon and acetal. While polytetrafluoroethylene (PTFE, Teflon) is normally regarded as having a lower coefficient of friction versus UHMW, IPX UHMW has a comparable ...
The most common material used is high-density polyethylene (HDPE), but recently [when?] ultra-high-molecular-weight polyethylene (UHMW-PE) is being used by some manufacturers. This new formula has the lowest coefficient levels of friction, at only 10% to 15% greater than real ice.
As can be estimated from weight loss and the density , the wear coefficient can also be expressed as: [2] K = 3 H W P L ρ {\displaystyle K={\frac {3HW}{PL\rho }}} As the standard method uses the total volume loss and the total sliding distance, there is a need to define the net steady-state wear coefficient:
It also has a lower coefficient of friction against ultra-high molecular weight polyethylene , the typical counterface material used in total joint replacements. These two factors likely contribute to the significantly lower UHMWPE wear rates observed in simulator testing.
Rulon is the trade name for a family of PTFE plastics produced by Saint-Gobain Performance Plastics. Rulon plastics are known for their low coefficient of friction, excellent abrasion resistance, wide range of operating temperatures, and chemical inertness. Common applications for Rulon include seals, piston rings, bearings, and electrical ...