The characteristics of pp metal coat hooks

PP metal clothes hook is a kind of semi crystalline material. It is more hard than PE and has a higher melting point. Due to the PP homopolymer type temperature is higher than C above is very brittle so many business of PP metal material clothes hook is to join ~ % or higher ratio of ethylene content in random copolymer of ethylene copolymer of pliers. Of the polymer type PP material with low heat distortion temperature ( ℃) , low transparency and gloss, low rigidity, but have stronger impact strength. The strength of the PP increased with the increase of ethylene content increased. The vicat softening temperature of the PP to C. Due to the high crystallinity, the surface of the material stiffness and resistance to scratch characteristics very well. PP environmental stress cracking problems. Usually, by using glass fiber, metal additives or thermoplastic rubber method for modification of PP. Turnover of PP MFR range in ~. Low MFR PP material impact resistant properties is good but low tensile strength. For MFR of the same material, the strength of the copolymer type than homopolymer type. Due to the crystallization, PP shrinkage rate is quite high, are generally. ~. %。 And the direction of the shrinkage rate uniformity is much better than PEHD etc. Glass additives can make the shrinkage rate to join %. %。 Homopolymer and copolymer of PP metal clothes hook material has excellent resistance to moisture, acid and alkali corrosion resistance, resistance to dissolve. However, it is the aromatic hydrocarbon ( Such as benzene) Solvents, chlorinated hydrocarbons ( Carbon tetrachloride) Solvents, such as no resistance. PP don't like PE still has the oxidation resistance at high temperature.