Polypropylene (PPL) a polymer prepared catalytically from propylene which differs from HDPE by having an isostatic replacement of a hydrogen atom by a methyl group on alternate carbon atoms in the main chain. Although largely unreactive chemically the presence of the methyl groups makes Polypropylene slightly more susceptible to attack by strong oxidizing agents than HDPE. A major advantage is Polypropylene's higher temperature resistance.
Excellent resistance (no attack) to dilute and concentrated Acids, Alcohols, Bases and Mineral Oils
Good resistance (minor attack) to Aldehydes, Esters, Aliphatic Hydrocarbons, Ketones and Vegetable Oils
Limited resistance (moderate attack and suitable for short term use only) to Aromatic and Halogenated Hydrocarbons and Oxidizing Agents.
Maximum Temperature: 275°F (135°C)
Minimum Temperature: 32°F (0°C)
Melting Point: 338°F (170°C)
Tensile Strength: 4,500 psi
UV Resistance: Poor
Specific Gravity: 0.90