On the applications of homopolymerized and copolymerized polyoxymethylene

May I ask which expert can tell me about the specific application areas of copolymerized and homopolymerized formaldehyde? ! ! ! :handshake :handshake :handshake

High-molecular-weight polyoxymethylene is a thermoplastic resin and an important engineering plastic. They usually include both homopolymers and copolymers. Homopolymerous formaldehyde, with a density of about 1.4 and a melting point of around 170–185℃ ； It possesses excellent rigidity, with a tensile strength of 68.9 MPa; its tensile strength per unit mass is higher than that of zinc and brass, and is close to that of steel ； It has good wear resistance, a low friction coefficient and low water absorption, but poor thermal stability and is not resistant to acids. Copolymerized formaldehyde improves thermal stability, allowing for long-term use at temperatures ranging from -40 to 104°C, although its mechanical strength decreases slightly. It can be processed using the common molding methods for thermoplastics. It is mainly used to manufacture mechanical parts such as seals, gears, bearings, and valves. High-performance modified varieties can be produced through methods such as blending and reinforcement. Homopolymerous formaldehyde is produced by the polymerization of pure formaldehyde under the catalysis of a BF3 ether complex, while copolymerous formaldehyde is obtained through the ring-opening polymerization of trimethylolpropane and dioxolane. 　　Polyoxymethylene is a thermoplastic engineering plastic with high crystallinity and high melting point; it possesses excellent rigidity, resilience, creep resistance, and wear resistance. It can replace metal materials such as copper, zinc, and aluminum, and is widely used in industries such as the automotive industry, machinery industry, electrical equipment, and daily hardware manufacturing