Acrylic products are widely used, such as instrument parts, car lights, optical lenses, transparent pipes and so on. Due to the difficulty and high cost of acrylic production, there are many low-quality and low-cost substitutes on the market. These substitutes, also called "acrylic", are actually ordinary organic boards or composite boards (also called sandwich boards). Ordinary plexiglass plate is cast with ordinary plexiglass cracking material and pigment, which has low surface hardness and is easy to fade, and the polishing effect is poor after polishing with fine sand. The composite board has only a thin layer of acrylic with ABS plastic in the middle, which is easy to be layered due to thermal expansion and cold contraction in use. True and false acrylic can be identified from the subtle color difference and polishing effect of the plate section. Acrylic has a wide range of uses, which can be used for test benches and wiring boards. Window, soundproof doors and windows, lampshades, telephone booths, light boxes, signboards, signs, booths, doors and windows of trains, cars and other vehicles. Medical applications: baby incubators, various surgical medical instruments, civil products: bathroom facilities, handicrafts, cosmetics, brackets, aquariums, etc. , instrument panel and protective cover, fluorescent lamp, chandelier, street lamp shade, etc. , application field: hotels. Application fields: ceiling, integrated ceiling, partition, screen, sliding door, transparent wall, hotel furniture, office furniture, bar, lighting, chandelier, logo, sign, floor, landscape, etc.