Polyoxymethylene (POM)
Overview
Injection molding grade general purpose polyoxymethylene (POM) is a semi-crystalline engineering thermoplastic renowned for its mechanical strength and precision moldability. Developed commercially in the 1950s, this acetal homopolymer offers superior dimensional stability compared to many other plastics. As a premium material for high-volume production, it combines low moisture absorption with excellent fatigue resistance, making it ideal for moving parts. The injection molding grade is specifically formulated with optimized flow characteristics for complex mold designs in industrial applications.
Physical and Chemical Properties
POM exhibits a unique combination of hardness (Rockwell M94) and toughness (impact strength ~110 J/m), with a crystalline structure contributing to its thermal resistance. Its coefficient of friction (0.1-0.3) rivals some lubricated metals, enabling self-lubricating applications. The material maintains mechanical properties across a wide temperature range (-40°C to 100°C continuous use). Chemical resistance includes alcohols, ketones, and hydrocarbons, though it's susceptible to strong acids and oxidizing agents. UV stabilizers are often added for outdoor applications.
Main Applications
Over 60% of POM consumption goes to automotive components like fuel system parts, window regulators, and seatbelt mechanisms due to its fuel resistance and durability. In consumer electronics, it's used for precision gears in cameras and printer mechanisms. Industrial applications include conveyor system components, pump parts, and valve bodies. Medical applications include inhaler mechanisms and surgical instrument components, though specialized medical grades are required for implantable devices.
Safety and Storage
POM pellets should be stored in original packaging with desiccant to prevent moisture absorption (max 0.2% moisture content for processing). Bulk storage requires temperature-controlled environments to prevent thermal degradation. Processing requires adequate ventilation as thermal decomposition above 230°C releases formaldehyde gas. Dust collection systems are mandatory during handling to prevent explosive dust-air mixtures (minimum explosive concentration: 30 g/m³).
B2B Procurement Guide
Key specifications to verify include melt flow index (typically 2-30 g/10min at 190°C/2.16kg), formaldehyde emission levels (<5ppm for indoor applications), and stabilizer packages (antioxidant content 0.1-0.5%). For high-precision parts, request batch consistency data on shrinkage rates (1.8-2.5% for unfilled grades). Consider suppliers with ISO 9001 certification and ask for processing parameter guidelines specific to your mold designs. Container-load (20MT+) purchases typically offer 8-12% cost advantages.
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