Ultra high molecular weight polyethylene sheet has the following characteristics:High wear resistance: The great characteristic of ultra-high molecular weight polyethylene sheets is their high wear re
Ultra high molecular weight polyethylene sheet has the following characteristics:
High wear resistance: The great characteristic of ultra-high molecular weight polyethylene sheets is their high wear resistance. Even metals such as carbon steel, stainless steel, bronze, etc. have lower wear resistance than ultra-high molecular weight polyethylene sheets. The wear resistance of this substance increases with the increase of polyethylene molecular weight.
Extremely high impact resistance: The relative molecular weight of ultra-high molecular weight polyethylene sheet is related to its relative molecular weight. When the molecular weight is less than 2 million, its impact strength increases with the increase of molecular weight; When it reaches a peak, its molecular weight will decrease as the molecular weight increases. This is because the irregularity of molecular chains hinders the crystallization of their crystals, resulting in a large amorphous region in the macromolecules that can effectively adsorb a large amount of collision energy. At -40 ℃, ultra-high molecular weight polyethylene has strong seismic resistance and can maintain good seismic resistance at -269 ℃. This excellent low-temperature characteristic expands its application range to low-temperature engineering.
Very low coefficient of friction: Ultra high density polyethylene has wear resistance, low coefficient of friction, and strong self-lubrication, making it a great choice for bearing sleeves, sliders, and lining materials. Using ultra-high molecular weight polyethylene sheets as friction components not only increases wear life, but also achieves the goal of energy conservation.
Excellent chemical corrosion resistance: Ultra high molecular weight polyethylene has excellent corrosion resistance. Except for concentrated nitric acid and sulfuric acid, it has no corrosive effect on various alkalis and acids. It is suitable for high temperatures (80 ℃), concentrated sulfuric acid (80 ℃), 20% nitric acid, 75% sulfuric acid, and water cleaning. However, in aromatic or halogen mixtures (especially at high temperatures), supramolecular weight polyethylene is prone to expansion, so extra caution should be exercised when using it.
Very low water absorption: Ultra high polymers have a very low water absorption rate, almost no water absorption, and will not expand in water, with a lower water absorption rate than nylon.
Thermal characteristics: According to ASTM (46 kg/cm2) testing, its thermal deformation temperature is 85 ℃, and under low load, its working temperature can reach 90 ℃; Under certain specific conditions, higher temperatures can be used because ultra-high molecular weight polyethylene sheets have good toughness and therefore good heat resistance. Even at a temperature of -269 ℃, they can still maintain high elasticity without cracking.