Acrylic - In the plastics industry most acrylics are polymers of methyl methacrylate (PMMA). Acrylics may be in the form of molding powders or casting syrups, and are noted for their exceptional clarity and optical properties. Acrylics are widely used in lighting fixtures because they are slow-burning or even self-extinguishing, and they do not produce harmful smoke or gases in the presence of flame. The most important properties for acrylic (PMMA) are its optical clarity, low UV sensitivity, and overall weather resistance. Acrylic is often used as a glass substitute.
In 1880 G. W. A. Kahlbaum reported the polymerization of methyl acrylate and at approximately the same time R. Fittig found that methacrylic acid and some of its derivatives readily polymerized. In 1932 J. W. C. Crawford discovered a new route to the monomer using cheap and readily available chemicals. Sheet polymethyl methacrylate (PMMA) became prominent during World War II for aircraft glazing.
耐候性 (183), 高透明性 (131), 高耐熱性 (103), 耐薬品性、良好 (95), 高耐衝撃性 (91), 高透過率 (83), 耐衝撃性 (76), 耐衝撃性改良 (76), 加工特性良好 (58), 高硬度 (54), 145 以上...
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- Poor solvent resistance
- Subject to stress cracking
- Low continuous service temperature
- Flexible grades unavailable
- Poor impact resistance
Typical Properties and Processing Information
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