polypropylene- Is it different from HDPE? Yes it is. To begin with, polypropylene is also called, "polypropene". it is a thermoplast polymer which is made from a monomer called propylene. Like HDPE it has a wide variety of applications such as packaging, labeling, textiles, ropes, stationery, automotive components and more. Like HDPE it is rugged and usually resists man chemical solvents and acids.
Several things differentiate polypropylene from HDPE. Density is the first factor. The density of polypropylene is between 0.895 and 0.92 g/cm². High Density Polyethylene is known for it's big strength-to-density ratio. The density of HDPE can range from 0.93 to 0.97 g/cm³. HDPE can be more rigid as a result. polypropylene, because of its lower density is used for molding parts with lower weight and more parts of a certain mass of plastic can be produced.
HDPE has a working temperature of 212 degrees F to 200 degrees F. Polypropylene has a melting point between 266 degrees F to 340 degrees F.
U.V. and Chemical Resistance
Polypropylene has good chemical resistance like HDPE but it has poor UV resistance -unless it is stabilized with additives. HDPE is resistant to many different solvents and has a wide variety of applications. It protects the environment by forming a chemical-resistant barrier to prevent the pollution of soil and groundwater by the liquid constituents of solid waste.
A lot has been written about both HDPE and Polypropylene. Please visit the web to learn more about these very versatile plastics.