polypropylene (PP) plastic is carried out after the nylon and excellent resin types, it is a kind of high density, no side chain, linear polymers, high crystallization will have good generalization function.
Not when color with a white translucent, waxy; Lighter than polyethylene. Transparency also relatively good polyethylene, polyethylene hardened.PP plastic concept: the proportion of molding shorten rate: molding temperature, dry conditions: molding function using typical automobile industry scale dry processing of melt temperature, mold temperature, injection pressure, injection speed: runner and gate:
chemical and physical properties.
PP plastic conceptWeight: 0.9 to 0.93 grams per cubic centimeterMolding
shorten rate: 1.0 to 2.5%
Mold temperature: 160-220 ℃
Dry conditions: function of material density is small, the strength stiffness, hardness, heat resistance are better than that of low pressure polyethylene, can use at 100 degrees. Has outstanding electrical function and high frequency insulation is not affected by humidity, but low temperature time-varying crisp, not wear-resisting easy ageing. Suitable for making general machinery parts, corrosion parts and insulation parts.
For the history and specific composition of pp materials, you can refer to this article.
