ABS has excellent mechanical properties, excellent impact strength, and can be used at extremely low temperatures; ABS has excellent wear resistance, good dimensional stability, and oil resistance, and can be used for bearings under medium loads and speeds. Creep resistance is greater than PSF and PC, but smaller than PA and POM. The flexural strength and compressive strength of ABS are inferior among Plastics. The mechanical properties are greatly affected by temperature. The heat distortion temperature of ABS is 93~118℃, and the product can be increased by about 10℃ after annealing treatment. ABS can still show a certain degree of toughness at -40℃, and can be used in the temperature range of -40~100℃. It is not affected by water, inorganic salts, alkalis and various acids, but it is soluble in ketones, aldehydes and chlorinated hydrocarbons, and will cause stress cracking when corroded by glacial acetic acid and vegetable oil. In addition, ABS has poor weather resistance and is prone to degradation under the action of ultraviolet light; after half a year outdoors, the impact strength drops by half.
PP is a semi-crystalline Plastic material. It is harder than PE and has a higher melting point. Since homopolymer PP is very brittle when the temperature is higher than 0C, many commercial PP materials are random copolymers with 1 to 4% ethylene or clamp copolymers with higher ethylene content. The polymer PP material has a lower thermal distortion temperature (100°C), low transparency, low gloss, and low rigidity, but has stronger impact strength. The strength of PP increases with the increase of ethylene content. The Vicat softening temperature of PP is 150C. Due to the high crystallinity, the surface rigidity and scratch resistance of this material are very good. PP does not have the problem of environmental stress cracking. Usually, the PP is modified by adding glass fiber, metal additives or thermoplastic rubber.
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