PP is a semi-crystalline material. It is harder and has a higher melting point than PE. Since the PP temperature of the homopolymer type is very brittle when it is higher than 0 ° C, many commercial PP materials are random copolymers of 1 to 4% ethylene or a clamp copolymer of a higher ratio of ethylene. The copolymer type PP material has a low heat distortion temperature (100 ° C), low transparency, low gloss, low rigidity, but has a stronger impact strength.

The strength of PP increases as the ethylene content increases. The Vicat softening temperature of PP is 150 °C. Due to the high degree of crystallinity, this material has excellent surface stiffness and scratch resistance. There is no environmental stress cracking problem in PP. The PP is usually modified by adding glass fibers, metal additives or thermoplastic rubber.

Kiwango cha mtiririko wa PP kina MFR inayotofautiana kati ya 1 hadi 40. Nyenzo za PP zenye MFR ya chini zina upinzani mzuri wa athari lakini elongation ya chini. Kwa nyenzo zenye MFR sawa, nguvu ya aina ya copolymer ni kubwa zaidi kuliko ile ya aina ya homopolymer. Maskin för återvinning och pelletisering av PP PE-flakeprodukter

Due to crystallization, the shrinkage rate of PP is quite high, generally 1.8 to 2.5%. And the direction uniformity of shrinkage is much better than materials such as PE-HD.

The addition of 30% glass additive can reduce the shrinkage to 0.7%. Both the homopolymer type and the copolymer type PP materials have excellent moisture absorption resistance, acid and alkali corrosion resistance, and solubility resistance. However, it is not resistant to aromatic hydrocarbons (such as benzene) solvents, hydrogen chloride (carbon tetrachloride) solvents, and the like.

PP does not have oxidation resistance at high temperatures like PE, and it is harmful to the human body.

Vikombe vya kutumika vinavyotumika katika maisha ya kila siku kwa ujumla vinatengenezwa kwa plastiki ya pc na pp.

PC är ett amorft ingenjörsmaterial med exceptionell slagstyrka, termisk stabilitet, glans, bakteriehämmande egenskaper, flamskyddande egenskaper och fläckbeständighet. PC:s gap

Styrkan är mycket hög och krympningsgraden är mycket låg, vanligtvis 0,1% till 0,2%. PC har goda mekaniska egenskaper, men flödesegenskaperna är dåliga, så detta

Mchakato wa kutengeneza kwa sindano wa vifaa ni mgumu. Unapochagua ni nyenzo gani bora ya PC ya kutumia, inapaswa kutegemea matarajio ya mwisho ya bidhaa. Ikiwa sehemu ya plastiki inahitaji upinzani wa juu wa athari, basi tumia mtiririko wa chini.

Nyenzo za Kinetic PC; kinyume chake, nyenzo za PC zenye kiwango cha mtiririko wa juu zinaweza kutumika kuboresha mchakato wa ukingo wa sindano.

PP polypropylene: joto la kuyeyuka: 220~275 °C.