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PP (Polypropylene)
A crystalline polymer with a melting point of 330°F (165°C), and heat deflection temperature ranging from 195°F (91°C) to 240°F (116°C) which is higher than other common plastics. Its key properties are high heat resistance (for piping an upper limit of 212°F (100°C)), a specific gravity of 0.91 if unmodified (the lightest of the most common thermoplastics), stiffness, and chemical resistance with respect to handling caustics, solvents, acids, and other organic chemicals. It is not recommended for use with oxidizing type acids, detergents, low boiling hydrocarbons, alcohols, and some chlorinated organic materials. Polypropylene is a relatively inert material and contributes little in the way of contamination to pharmaceutical water