Overview
Polyoxymethylene (POM), commonly known as acetal or polyacetal, is a thermoplastic engineering polymer prized for its high mechanical strength, rigidity, and resistance to wear and chemicals. Developed in the 1950s, POM exists in two forms: homopolymer (e.g., Delrin) and copolymer, with the latter offering better thermal and chemical stability. POM is widely used in precision parts requiring tight tolerances, such as gears, fasteners, and conveyor belts. Its low moisture absorption and excellent dimensional stability make it ideal for applications where metal alternatives are impractical or costly.
Physical and Chemical Properties
POM exhibits a crystalline structure, contributing to its high tensile strength (up to 70 MPa) and stiffness. It has a low coefficient of friction, comparable to PTFE, and maintains performance across temperatures from -40°C to 100°C. The material is resistant to hydrocarbons, alcohols, and weak acids but degrades in strong acids or bases. Notably, POM has limited UV resistance and may require stabilization additives for outdoor use. Its electrical insulation properties and flame-retardant variants expand its utility in electronics and automotive sectors.
Main Applications
POM’s primary use is in mechanical components subject to repetitive stress, such as gears, bearings, and pump parts. In automotive engineering, it appears in fuel system components, door handles, and seatbelt mechanisms due to its durability and lightweight nature. The medical industry employs POM for inhalers and surgical instruments, while consumer goods like zippers, locks, and kitchen utensils benefit from its smooth surface and food-grade variants. Its machinability allows for intricate designs, replacing metals in cost-sensitive applications.
Safety and Storage
POM is generally safe to handle but may release trace formaldehyde during processing (e.g., injection molding). Adequate ventilation and PPE (gloves, masks) are recommended. Storage should avoid prolonged exposure to sunlight or moisture to prevent degradation. Fire hazards are minimal, but combustion emits toxic gases. Disposal should follow local regulations for plastics, with recycling options limited due to its specialized composition. Suppliers often provide Material Safety Data Sheets (MSDS) for specific grades.
B2B Procurement Guide
When procuring POM, specify copolymer (better chemical resistance) or homopolymer (higher mechanical strength). Key considerations include FDA compliance for food-contact applications, UV stabilization for outdoor use, and color requirements. MOQs typically start at 1 ton, with prices varying by grade and supplier. Reliable manufacturers include DuPont (Delrin), Celanese, and Mitsubishi Engineering-Plastics. Sample testing for dimensional accuracy and wear resistance is advised. Lead times range from 2–6 weeks, depending on customization and global supply chain conditions.
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