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> Plexiglass vs. Plexiglas®: Acrylic Sheeting Facts

> These two terms are pronounced the same, spelled almost identically, and can be compared to the relationship of tissue and Kleenex. These are known as proprietary eponyms, meaning a trade name has become the generic name for a product or service. Sometimes these are referred to as generic trademarks. What makes it particularly difficult to know the difference between plexiglass and Plexiglas® is the small variation in spelling. The difference in one letter stumps many people. Plexiglass with two s’s is the generic term synonymous with acrylic sheet. Plexiglas® with one s is the brand name. Other trade names that have become comparable to Plexiglas® include Acrylite®, Lucite®, and Perspex®.

[0] https://www.acplasticsinc.com/informationcenter/r/plexiglass...