Overview
POM powder, or polyoxymethylene, is a thermoplastic polymer prized for its mechanical strength and dimensional stability. Often branded as 'Delrin' (homopolymer) or 'Celcon' (copolymer), it is synthesized via polymerization of formaldehyde. The material’s balanced properties—including low moisture absorption and resistance to hydrocarbons—make it a staple in precision engineering. First commercialized in the 1960s, POM fills the gap between metals and conventional plastics. Its copolymer variant offers better chemical resistance, while homopolymer grades excel in mechanical performance. Industrial buyers typically procure it in powder or pellet form for injection molding or extrusion processes.
Physical and Chemical Properties
POM powder exhibits a crystalline structure, contributing to its high tensile strength (60–70 MPa) and rigidity. Its low coefficient of friction (0.1–0.3) rivals that of PTFE, making it ideal for wear-resistant applications. Thermal stability is moderate, with continuous use temperatures up to 85–105°C depending on the grade. Chemically, POM resists alkalies, solvents, and fuels but degrades under strong acids or UV exposure. Additives like UV stabilizers or glass fibers are often blended to enhance performance. Notably, it emits trace formaldehyde when heated above 230°C, requiring ventilation during processing.
Main Applications
POM’s precision and durability lend it to high-stress mechanical components. In automotive systems, it’s used for fuel pump gears, seatbelt mechanisms, and door handles. Industrial applications include conveyor belts, pump housings, and zippers. The electronics sector leverages its insulating properties for keyboard switches and connector housings. Medical devices, such as inhaler components, utilize FDA-compliant grades. Its machinability also makes it a prototyping favorite for jigs and fixtures.
Safety and Storage
Store POM powder in sealed containers to prevent moisture absorption, which can affect processing. Although non-toxic at room temperature, overheating during machining or molding requires fume extraction due to formaldehyde release. Personal protective equipment (PPE) like gloves and masks is recommended during handling. Fire hazards are minimal, but combustion produces toxic gases—Class B extinguishers are advised. Always comply with SDS guidelines for workplace safety.
B2B Procurement Guide
When sourcing POM powder, clarify copolymer (better chemical resistance) vs. homopolymer (higher strength) needs. Key specifications include melt flow index (MFI) for processability and stabilizer packages for UV/thermal resistance. Bulk orders (1+ metric tons) often secure discounts. Verify supplier certifications like ISO 9001 and request material datasheets. For niche applications, custom-compounded grades with additives (e.g., PTFE for lubrication) are available at premium prices.
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