With a molecular chain length 10-20 times that of high density polyethylene, the longer molecular chain (higher molecular weight) gives UHMWPE the main advantages in toughness, wear resistance and stress crack resistance, since it is a polyethylene UHMWPE also has lubricity, chemical resistance and excellent electrical properties of general HDPE. Its development success is widely regarded as one of the top ten scientific and technological achievements of the 20th century.
Excellent wear resistance, good low temperature impact resistance, self-lubricating, non-toxic, water and chemical resistance, heat resistance is better than general PE, the disadvantage is low heat resistance (heat distortion temperature), processing and forming Poor, outer surface hardness, rigidity, creep resistance is not as good as general engineering plastics, the expansion coefficient is too large. UHMWPE has poor fluidity and high viscosity in molten state. It is a rubber-like high-viscosity elastomer. It can only be formed by pressing and sintering at an early stage. It can also be processed by extrusion, injection molding and blow molding.
The mechanical properties are higher than the general high density polyethylene. It has outstanding impact resistance, stress crack resistance, high temperature creep resistance, low friction coefficient, self-lubricating property, excellent chemical resistance, fatigue resistance, noise damping, and nuclear radiation resistance.
The use temperature is 100 to 110 °C. Good cold resistance, can be used at -269 °C. The product with a density of 0.935g/cm3 and a molecular weight of 2 million has a tensile strength at break of 40 MPa, an elongation at break of 350%, a flexural modulus of 600 MPa, and a cantilever beam notched impact. The amount of wear (MPC method) is 20 mm.