A thermoplastic resin produced by the polymerization of propylene. It comes in three configurations: isotactic, atactic, and syndiotactic, with isotactic being the main component in industrial products. Polypropylene also includes copolymers of propylene with a small amount of ethylene. It is typically a translucent, colorless solid with no odor or toxicity. Due to its regular structure and high crystallinity, it has a melting point of up to 167°C, is heat-resistant, and can be sterilized with steam, which is a notable advantage. With a density of 0.90 g/cm³, it is a lightweight general-purpose plastic. It is resistant to corrosion and has a tensile strength of 30 MPa, offering better strength, rigidity, and transparency than polyethylene. Its drawbacks include poor low-temperature impact resistance and tendency to age, but these can be overcome by modification and the addition of antioxidants.
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