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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, which helped create a market for this plastic. It is now used surgically as a reinforcing mesh in inguinal hernia repair.