Marlex
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Marlex is a trademarked name for "crystalline polypropylene" and "high-density polyethylene" (HDPE). These plastics were invented by J. Paul Hogan and Robert Banks two research chemists at the Phillips Petroleum company.
Marlex was used by Wham-O for their Hula Hoops in the 1950s. This is what helped to created a market for this plastic.