Everyone has heard of PP material, but many people do not know what PPC and PPH materials are. Today, we will take you to understand the differences between PPC and PPH.

When it comes to PPC and PPH, we have to first talk about the PP material. PP is a semi crystalline material. It is harder and has a higher melting point than PE. Due to the brittleness of homopolymer type PP at temperatures above 0 ℃, many commercial PP materials are made by adding 1-4% ethylene Irregular copolymers or higher ethylene content clamp block copolymers. Copolymer type PP materials have lower thermal distortion temperature (100 ℃), low transparency, low glossiness, and low rigidity, but have stronger impact strength. The strength of PP increases with the increase of ethylene content Big. The Vicat softening temperature of PP is 150 ℃. Due to its high crystallinity, this material has excellent surface stiffness and scratch resistance. PP does not have environmental stress cracking issues. Usually, PP is modified by adding glass fiber, metal additives, or thermoplastic rubber. PP The flow rate MFR ranges from 1 to 40. PP materials with low MFR have good impact resistance but low ductility strength. For materials with the same MFR, the strength of the copolymer type is higher than that of the homopolymer type. Due to crystallization, the shrinkage rate of PP is quite high, generally ranging from 1.8 to 2.5%. And the direction of shrinkage rate The uniformity is much better than materials such as PE-HD. Adding 30% glass additive can reduce the shrinkage rate to 0.7%. Both homopolymer and copolymer PP materials have excellent resistance to moisture absorption, acid and alkali corrosion, and solubility. However, it has significant effects on Aromatic hydrocarbon (such as benzene) solvent, chlorine Hydrocarbon (carbon tetrachloride) solvents have no resistance. PP does not have the same antioxidant properties as PE at high temperatures.

4. pph is more resistant to high temperatures

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