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Polyoxymethylene (POM)
2.5-3.5 usd/kg
Polyoxymethylene (POM), also known as acetal, is a high-performance engineering thermoplastic used for its combination of mechanical properties combined with low surface friction and excellent dimensional stability. Available in both homopolymer (POM-H) and copolymer (POM-C) forms, POM is widely used in precision parts that require high stiffness, low wear, and consistent performance over a wide range of temperatures. Its natural lubricity and high fatigue resistance make it ideal for gears, bearings, bushings, and other moving components, while its low moisture absorption ensures reliable performance in humid environments.
POM’s versatility is further enhanced by the availability of reinforced grades, such as glass fibre (GF) and carbon fibre (CF) composites, which enhance stiffness, strength, and heat resistance. This allows POM materials to be tailored for demanding structural applications in automotive, electronics, consumer goods, and industrial machinery. While POM-H offers slightly higher mechanical properties, POM-C stands out for its superior resistance to hydrolysis and chemicals, making it the preferred choice for applications involving water or aggressive substances.
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Sustainability concerns
Non-renewable ingredients
Raw material generates polluting by-products
Low circularity potential
Microplastics
POM-H is the homopolymer form of polyoxymethylene (POM), characterised by higher crystallinity, strength, stiffness, and hardness compared to its copolymer counterpart. The most recognised brand is Delrin (100, 500 and 900 series, for example).
POM-H offers excellent wear resistance, high mechanical strength, and a low coefficient of friction, making it ideal for precision parts that require dimensional stability and durability, such as gears, cams, bushings, slide rails, and bearing seats. However, POM-H is less resistant to hydrolysis and strong bases, so it is not recommended for long-term use in humid or chemically aggressive environments. Its higher cost and slightly more challenging machinability are offset by its superior mechanical properties, making it the preferred choice for high-performance engineering applications where rigidity and wear resistance are critical.
