POM (polyoxymethylene) is an excellent engineering plastic, known abroad as "Steel Stealer." It is a linear polymer without side chains, high in density and crystallinity, offering a comprehensive set of properties. POM is a smooth, glossy, hard, and dense material, available in pale yellow or white, and can be used over a long period at temperatures ranging from -40 to 100°C. It also boasts superior properties in terms of hardness and self-lubricity compared to most engineering plastics, along with good oil and peroxide resistance. However, it is not resistant to acids, strong alkalis, or UV radiation from sunlight. POM has a tensile strength of up to 70MPa, low water absorption, stable dimensions, and a glossy appearance—outperforming nylon in these aspects. As a highly crystalline resin, POM is tough among thermoplastic resins. It has high thermal, bending, and fatigue resistance strengths, as well as excellent mechanical and electrical properties.