Overview
UV-resistant POM is a modified version of polyoxymethylene (POM) engineered to withstand ultraviolet radiation degradation. Standard POM suffers from chain scission and yellowing when exposed to sunlight, but this variant incorporates UV stabilizers like hindered amine light stabilizers (HALS) or carbon black. Primarily used in outdoor applications, it combines POM's inherent advantages—high mechanical strength, excellent wear resistance, and low moisture absorption—with prolonged weatherability. Manufacturers often compound it with pigments to further enhance UV protection while maintaining color consistency.
Physical and Chemical Properties
The material retains standard POM's crystalline structure, offering a tensile strength of 60-70 MPa and a low coefficient of friction (0.1-0.3). UV stabilizers reduce surface embrittlement, maintaining impact resistance even after extended outdoor use. Chemically, it resists hydrocarbons, alcohols, and weak acids but may degrade in strong acids or bases. The UV additives do not significantly alter thermal properties, with a continuous service temperature of -40°C to 90°C. Unlike untreated POM, it shows less than 10% elongation loss after 1,000 hours of QUV accelerated weathering testing.
Main Applications
Automotive industries use UV-resistant POM for exterior door handles, mirror housings, and trim components due to its color retention and dimensional stability. In consumer goods, it appears in garden tool mechanisms, outdoor sporting equipment, and irrigation system parts. Industrial applications include conveyor components in sun-exposed areas and electrical insulator housings. Its self-lubricating properties make it suitable for outdoor gears and bearings, where traditional lubricants might wash away. Medical applications are limited due to stabilizer migration concerns.
Safety and Storage
While POM dust poses minor inhalation risks during machining, UV-resistant grades contain stabilizers that may require additional handling precautions. Suppliers typically provide Material Safety Data Sheets (MSDS) with stabilizer-specific guidelines. Storage recommendations include keeping the material in original packaging at temperatures below 30°C and relative humidity under 50%. Prolonged exposure to high humidity can cause slight dimensional changes before processing. Processors should dry the material at 80-90°C for 2-4 hours before molding to prevent bubbling.
B2B Procurement Guide
When sourcing UV-resistant POM, confirm the stabilizer system's expected lifespan under UV exposure—typically rated in years (e.g., 5-year vs. 10-year resistance). Request weathering test reports per standards like ISO 4892 or ASTM G154. For colored products, verify that pigments are also UV-stable to prevent fading. Bulk pricing tiers usually start at 500kg, with discounts of 8-15% for full-container loads. Lead times range from 4-8 weeks for custom-compounded grades. Consider regional suppliers to minimize logistics costs unless specialty formulations are required.
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