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General-purpose polystyrene is clear, hard, and brittle. It is an inexpensive resin per unit weight. It is a poor barrier to air and water vapor and has a relatively low melting point. [6] Polystyrene is one of the most widely used plastics, with the scale of its production being several million tonnes per year. [7]
The polymer separated from the glass as a clear plastic sheet, which Röhm gave the trademarked name Plexiglas in 1933. [5] Both Perspex and Plexiglas were commercialized in the late 1930s. In the United States, E.I. du Pont de Nemours & Company (now DuPont Company) subsequently introduced its own product under the trademark Lucite.
MMA was discovered by Bernhard Tollens and his student W. A. Caspary in 1873, [5] who noticed and described its tendency to change into a clear, hard, transparent substance especially in sunlight. [6]
POM is a strong and hard plastic, about as strong as plastics can be, and therefore competes with e.g. epoxy resins and polycarbonates. The price of POM is about the same as that of epoxy. There are two main differences between POM and epoxy resins: epoxy is a two-component resin that can be cast, and adheres to everything it touches,
The result is a hard plastic material. [27] Asbestos was gradually abandoned as filler because many countries banned the production of asbestos. [10]: 9 [28] Bakelite's molding process had a number of advantages. Bakelite resin could be provided either as powder or as preformed partially cured slugs, increasing the speed of the casting.
About 26,550 pounds — or about 28,320 boxes — of TGI Friday’s Chicken Bites in Honey BBQ flavor have been recalled because the bites might be a bite into “clear, hard plastic.”
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