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rapid development of the production of polyethylene, plastics total production accounts for about 1 / 4. Polypropylene (PP) prepared by the polymerization of propylene and a thermoplastic resin is obtained. There was an isotactic, syndiotactic and atactic material was three configurations, isotactic industrial products as a main component thereof. Polypropylene also includes a small amount of propylene and copolymers, including ethylene. Usually translucent colorless solid, odorless, non-toxic, is the lightest common plastic. Corrosion resistance, tensile strength of 30MPa, strength, rigidity and transparency better than polyethylene. The disadvantage is the low temperature impact resistance, easier to aging. Bags

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