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 ? improve wear resistance. Molecular weight polyethylene to improve performance of the most striking one is that it has a very high wear resistance, the performance of many engineering applications are very valuable. In the present, all plastic, its wear resistance is the best, even many metallic materials (such as carbon steel, stainless steel, bronze, etc.) are not as grind-it rules. With the increase of molecular weight polyethylene, this material more wear-resistant 
 ? high impact resistance. Impact strength of UHMWPE and its molecular weight of the molecular weight of less than 200 million, the increase with the molecular weight, impact strength increased to reach 200 million of a peak, then peak, the molecular weight and then increased impact strength but will decline. This is because the molecular chain is very light when it hindered the role of crystal, so that in the presence of large molecules in amorphous region which can absorb a larger impact energy. 
 Based on the literature, ultra-high molecular weight polyethylene and other plastics were measured according to ASTM-D256 impact strength value, drawn from the comparison: ultra-high molecular weight polyethylene at room temperature impact resistance can be divided into the known impact-resistant polycarbonate ester comparable, commonly used in engineering plastics. UHMWPE-40oC even at low temperatures, there is still ridiculed for impact resistance, even in the liquid-gas-269oC temperature, still maintaining good impact resistance, excellent low temperature properties of this so high molecular weight polyethylene to low-temperature engineering applications. 
 ? 3, low coefficient of friction. Very high molecular weight polyethylene wear, and low coefficient of friction, good self-lubricating, is an ideal bearing sleeve, slide, lining materials. 
 UHMWPE as a device using the friction components, in addition to improved wear life, it can also receive energy-saving effect. 
 ? 5, low water absorption. UHMWPE is very low water absorption, it is almost non-absorbent, does not swell in water, much less absorbent than nylon. 
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