PMMA is a tough and rigid plastic. In addition, it has almost perfect transmission of visible light, and, because it retains these properties over years of exposure to ultraviolet radiation and weather, it is an ideal substitute for glass. Because PMMA displays the unusual property of keeping a beam of light reflected within its surfaces, it is frequently made into optical fibres for telecommunication or endoscopy. PMMA is often used as a substitute for glass in products such as shatterproof windows, skylights, illuminated signs, because is very transparent (92-94% of transmittance) more than glass ( 80-90%).
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