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Polypropylene- Is it different from HDPE?

Posted by The Plastic Sheeting Gurus! on Tue, May 17, 2016 @ 02:45

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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.  

Density Differences:

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.

Temperature Differences:

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.


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Tags: HDPE