... is Polymethyl Methacrylate,also known as acrylic or organic glass.PMMA by the methyl methacrylate polymerization,is an early ... material, the transmittance achieves 93%, is higher than the glass penetrability(5) Low melting point: PMMA melting point approximately ... excellent,light and soft (2) Shock resistance: is the glass product 200 times, almost no risk of fracture.(3) Flame resistance ...