Polypropylene (PP) is a kind of thermoplastic resin produced by the polymerization of propylene. In general,pp is a semi-translucent colorless and odorless solid with non-toxic. Due to its structural regularity and highly crystallized, the melting point can reach to 167 ℃. Thus, the main advantage of PP is heat resistance and corrosion resistance. Moreover, the products produced by PP can use steam to do sterilization. Also, PP is the lightest plastic because of the low density. The advantages above have led to the widespread use of PP in packing box,woven articles,household goods,auto parts, etc.
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