Knowledge

Home > Knowledge > Content
Has excellent resistance to moisture absorption, acid and alkali corrosion resistance
Apr 28, 2018

PP board strength instructions. PP strength increases with increasing ethylene content. The Vicat softening temperature of PP is 150°C. Due to the high degree of crystallinity, this material has very good surface stiffness and scratch resistance. PP does not have the problem of environmental stress cracking. In general, PP is modified by adding glass fibers, metal additives, or thermoplastic rubber. PP flow rate MFR range is 1~40. PP materials with low MFR have better impact resistance but lower strength. For the same MFR material, the copolymer type has higher strength than the homopolymer type. Due to crystallization, PP shrinkage is quite high, typically 1.8 to 2.5%. And the uniformity of the shrinkage direction is much better than that of materials such as PE-HD. Adding 30% of the glass additive can reduce the shrinkage to 0.7%. Homopolymer and copolymer PP materials have excellent resistance to moisture absorption, acid and alkali corrosion, and resistance to dissolution. However, it is not resistant to aromatic hydrocarbons such as benzene solvents, chlorinated hydrocarbon (carbon tetrachloride) solvents, and the like. PP is not as resistant to oxidation as PE at high temperatures.

PP sheet is a semi-crystalline material that has a harder, higher melting point than PE sheet. Homopolymer PP panels are very fragile when the temperature is higher than 0°C. In order to solve this problem, many manufacturers add 1% to 4% random copolymer ethylene to the PP material during the production process. PP materials have a low thermal distortion temperature, low transparency, low gloss, and low rigidity, but have a stronger impact strength. The strength of PP increases with the ethylene content. Due to the high degree of crystallinity, this material has very good surface stiffness and scratch resistance. PP sheet does not have the problem of environmental stress cracking. PP sheet can be modified by adding glass fiber, metal additives or thermoplastic rubber. Under the influence of crystallization, the shrinkage of PP sheet is quite high, generally 1.8 to 2.5%, and the direction of the shrinkage uniformity is much better than PE and other materials. PP materials have excellent resistance to moisture absorption, acid and alkali corrosion, and resistance to dissolution. However, PP sheet is not resistant to aromatic hydrocarbon solvents, chlorinated hydrocarbon solvents, and the like.








Copyright © Wenzhou Xintai New Materials Stock Co.,Ltd All Rights Reserved.Tel: 0086 577 26898244