Polymethyl methacrylate (POM) is a high-performance engineering plastic, known as "steel stealer" or "super steel" abroad. POM is a tough and elastic material that maintains excellent creep resistance, geometric stability, and impact resistance even at low temperatures. It comes in both homopolymer and copolymer forms. Homopolymers offer good elongation strength and fatigue resistance but are not easy to process. Copolymers, on the other hand, possess excellent thermal and chemical stability and are more process-friendly. Both homopolymers and copolymers are crystalline and moisture-resistant. The high crystallinity of POM results in a relatively high shrinkage rate, up to 2% to 3.5%. Different reinforced materials have varying shrinkage rates.POM boasts metal-like hardness, strength, and rigidity, excellent self-lubricating properties over a wide temperature and humidity range, good fatigue resistance, and high elasticity. Additionally, it has good chemical resistance.