Overview
Brown POM (Polyoxymethylene) is a high-performance engineering thermoplastic known for its excellent mechanical properties and durability. It is a copolymer or homopolymer variant of acetal resin, distinguished by its brown coloration, which is often achieved through the addition of pigments or fillers. POM is prized in industrial applications for its high strength, rigidity, and resistance to wear and fatigue. The brown variant is commonly used where aesthetic considerations or UV resistance are important, though its mechanical properties remain comparable to standard POM.
Physical and Chemical Properties
Brown POM exhibits a density of approximately 1.41-1.42 g/cm³ and a melting point range of 165-175°C. Its molecular structure provides exceptional dimensional stability, low moisture absorption, and resistance to creep under continuous load. The material's chemical resistance is notable, withstanding oils, fuels, and many solvents. However, it is susceptible to strong acids and oxidizing agents. The brown pigmentation does not significantly alter the base material's properties but may offer slight improvements in UV stability compared to natural POM.
Main Applications
Brown POM finds extensive use in automotive components such as fuel system parts, door handles, and seat belt mechanisms where its color and durability are advantageous. In industrial settings, it's employed for gears, bearings, and conveyor components. The consumer goods sector utilizes brown POM for appliance parts, zippers, and various household items where the earthy color provides aesthetic appeal. Its excellent machining characteristics make it popular for precision parts across multiple industries.
Safety and Storage
Proper handling of brown POM requires attention to dust control during machining operations, as inhalation of fine particles may cause respiratory irritation. Adequate ventilation is recommended in processing areas. Storage should be in sealed containers away from moisture and extreme temperatures. While POM is generally stable, prolonged exposure to UV light can cause surface degradation, making proper storage particularly important for colored variants like brown POM.
B2B Procurement Guide
When sourcing brown POM, buyers should specify whether they require homopolymer (POM-H) or copolymer (POM-C) grades, as these offer different thermal and chemical resistance profiles. Color consistency is another critical factor, especially for visible components. Lead times for colored POM compounds may be longer than for natural grades due to specialized compounding requirements. Buyers should verify regulatory compliance (such as FDA or RoHS) if the material will contact food or be used in regulated industries. Bulk purchases typically offer better pricing, with standard order quantities ranging from 500kg to full container loads.
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