Polyethylene is a member of the polyolefin family that also includes polypropylene. This group of materials is the most widely used accounting for over half of worldwide thermoplastic consumption Compared to LDPE, HDPE has greater rigidity, hardness, heat distortion temperature (HDT) and chemical resistance but a lower impact strength. It has better low temperature properties than polypropylene homopolymer but is not as flexible or as hard. As with polypropylene, the material is resistant to boiling water.
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