Polypropylene is a polymer of propylene by addition polymerization.It is white waxy material, transparent and light in appearance.Flammable, melting point 189℃, softening at 155℃ or so, using temperature range of -30 ~ 140℃.Under 80℃, it can resist the corrosion of acid, alkali, salt liquid and various organic solvents, and can decompose under the action of high temperature and oxidation.

Polypropylene is a colorless, odorless, non-toxic, translucent solid substance.Polypropylene is a thermoplastic synthetic resin with excellent properties, chemical resistance, heat resistance, electrical insulation, high strength mechanical properties and good high wear resistance.The most prominent property of polypropylene is its multifaceted nature, which can be suitable for many processing methods and applications.Its value and versatility mainly comes from excellent chemical resistance, the lowest density and highest melting point among thermoplastics, and moderate cost.

The viscosity of plastic particles and injection molding, blister, extrusion process requirements, injection molding requirements of the viscosity in 2.7. Blister requires a viscosity of 2.2. Extrusion requires a viscosity of 3.2. Viscosity is high, fluidity is low, with injection molding affirmation is not good, had better be extruded.