Plastic Co., Ltd., Dongguan City-Xuan | Guangdong PP plastic wholesale / wholesale Dongguan PP plastic polypropylene (PP plastic) is another fine nylon resin varieties Following the development, it is a high density, no side chain will be of high crystallinity linear polymer with excellent overall performance. When uncolored white translucent, waxy; lighter than polyethylene. Transparency is also better than the polyethylene, rigid than polyethylene. PP plastic is polypropylene plastic, is non-toxic, no harm to human body. The cup is made of polypropylene non-toxic, the processing temperature (℃) during the production of 180 to 240. So do not put it in boiling water decomposition. So do not worry about the problem of toxic products, see when eating utensils: pots, barrels, furniture, film, bags, caps, car bumpers. PP is a semi-crystalline materials. It is harder than PE and has a higher melting point. Since the type of PP homopolymer is higher than the temperature above 0 ℃ very brittle, so many commercial PP material is added 1 to 4% ethylene random copolymer or a copolymer of a higher ratio of clamp-stage ethylene content. Copolymer PP material has a lower heat distortion temperature (100 ℃), greater transparency, low gloss, low rigidity, but have a stronger impact strength. PP impact strength with increasing ethylene content increases. PP Vicat softening temperature of 150 ℃. Due to the high degree of crystallinity, surface stiffness and scratch resistance properties of this material very well. PP environmental stress cracking problem does not exist. Generally, the use of glass fiber, metal additives or thermoplastic rubber modified PP. MFR PP turnover ranges from 1 to 40. PP material better impact properties but low MFR extended lower intensity. MFR for the same material, a copolymer type impact strength than the homopolymer type is higher. Because of the crystal, PP contraction rate is very high, typically 1.8 to 2.5%. And shrinkage direction uniformity than PE-HD material is much better. 30% of glass additives can make the shrinkage rate to 0.7%. Homopolymer and copolymer PP material has excellent resistance to moisture absorption, resistance to acid corrosion, anti-solubility. However, it aromatic hydrocarbons (such as benzene) solvents, chlorinated hydrocarbons (carbon tetrachloride) solvents is not resistance. PP did not like PE at high temperatures still have antioxidant activity.