GUTE TEK PLASTIC DIY acrylic light guide plate night light, Poly (methyl methacrylate) (PMMA), also known as acrylic, acrylic glass, perspex, or plexiglass. PMMA is a strong, tough, and lightweight material. It has a density of 1.17–1.20 g/cm3, which is less than half that of glass. It also has good impact strength, higher than both glass and polystyrene. PMMA passes infrared light of up to 2,800nm and blocks IR of longer wavelengths up to 25,000nm. it's a best choice for home decor DIY crafts.