Polymethyl methacrylate (PMMA) is a smooth, glossy, hard, and dense material, available in pale yellow or white, with thin-walled sections appearing semi-transparent. It has flammable properties that make it easy to ignite, continue burning after being removed from the flame, with a yellow flame at the top and a blue flame at the bottom, melting and dripping, emitting a strong刺激性 formaldehyde odor and a fishy smell.POMBroadly used in manufacturing various sliding and rotating mechanical parts, including gears, levers, pulleys, sprockets, especially suitable for bearings, hot water valves, precision metering valves, conveyor chain links and rollers, flowmeters, automotive interior and exterior handles, crankshafts for window turning mechanisms, oil pump bearing seats and impeller gas control valves, electronic switch components, fasteners, terminal covers, fan parts, heating plates, instrument buttons; bearings for recording and video tapes; various pipeline systems and agricultural sprinkler systems, as well as valves, nozzles, bathtub parts; on/off keypads, buttons, audio/visual tape reels; temperature control timers; power tools, garden maintenance tool parts; also serves as surfboard, sailboat, and various sled parts, watch miniature gears, framework accessories for sports equipment, and various rings, fasteners, lighters, zippers, buckles for backpacks; medical devices including pacemakers; artificial heart valves, vertexes, prosthetics, etc.