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Polymethyl methacrylate (PMMA), [6] commonly known as acrylic, is a transparent thermoplastic available for use as ocular prosthesis, replacement intraocular lenses when the original lens has been removed in the treatment of cataracts and has historically been used as hard contact lenses.
PMMA is also known as acrylic, acrylic glass, as well as by the trade names and brands Crylux, Hesalite, Plexiglas, Acrylite, Lucite, and Perspex, among several others . This plastic is often used in sheet form as a lightweight or shatter-resistant alternative to glass. It can also be used as a casting resin, in inks and coatings, and for many ...
They protect the head, face, and neck from wind and low temperatures and can fit easily under helmets. These sports balaclavas can be full balaclavas, which cover the entire head leaving only the eyes uncovered, or half-balaclavas, which leave the forehead free, but cover most of the head.
Football helmets bear the logo of the team and the team colors. By the mid-1980s, the football helmet had become a complex, highly engineered piece of equipment. The inside of the helmets was lined with foam padding and plastic pods, or an inflatable layer designed to absorb the shock of impact and create as tight as fit as possible.
By law, all helmets sold in the U.S. must meet standards set by the Consumer Products Safety Commission (CPSC). [5] There were two helmet recalls in the year 2000. [1] A helmet made by Rand International of Farmingdale, NY was voluntarily recalled and involved 70,000 helmets known as "L.A. Cruisin' Bike Helmets" in child, youth and adult sizes. [1]