{"id":11,"count":1,"description":"Polyoxymethylene (POM, polyacetal)\r\n\r\nPolyoxymethylene (polymethylene oxide) is a synthetic polymer, the product of formaldehyde polymerization. Designation: POM. Other designations: POM C (copolymer), POM H (homopolymer), POM-HI (impact-resistant grades containing non-thermoplastic rubber), ACETAL, acetals, etc. General group name: polyacetals.\r\n\r\nWhen choosing a particular polyacetal grade, it is important to understand their similarities and differences.\r\n\r\nPOM copolymer and homopolymer are similar in most of their properties: hardness, toughness, low coefficient of friction, good wear resistance, excellent fatigue endurance. Both types of material are opaque, have low UV resistance, are prone to thermal decomposition, are readily attacked by acids and alkalis, and have poor fire performance.\r\n\r\nHowever, there are also some differences between these types of POM. Homopolymers generally have a higher degree of crystallinity. Consequently, they offer the following short-term mechanical properties: higher stiffness, tensile strength, impact resistance and initial creep resistance. Compared with homopolymers, copolymers have better oxidation resistance and show better resistance to creep and creep rupture over longer time scales.\r\n\r\nThere are also polyacetals with fillers. Glass-fiber-filled copolymers have better mechanical properties than the corresponding homopolymers. This is because a slightly different chemical structure provides better bonding between the polymer and the glass fiber.\r\n\r\n\r\n\r\n\r\n<blockquote>Comparing copolymers and homopolymers: copolymers, having lower crystallinity, generally offer better dimensional stability, a lower coefficient of friction and greater wear resistance. Although homopolymers have lower moisture absorption, the copolymer is less prone to hydrolysis in hot water.<\/blockquote>\r\n\r\n\r\n\r\nCopolymers also have better resistance to alkaline media. Owing to their higher crystallinity, homopolymers have a higher heat deflection temperature, whereas copolymers allow higher continuous-use temperatures thanks to better long-term stability.\r\n\r\nThe properties of POM C copolymers and POM H homopolymers are set out in more detail below.\r\n\r\nPOM C polyacetals\r\n\r\nPOM copolymer has a linear structure with a high degree of crystallinity, which provides a wide range of characteristics, namely: excellent wear resistance, long-term fatigue endurance, impact strength and creep resistance, as well as excellent resistance to moisture, solvents and strong alkalis.\r\n\r\nIts chemical structure provides higher resistance to thermal and oxidative degradation compared with acetal homopolymers.\r\n\r\nProperties:\r\n\r\n \u2014 Very strong at sub-zero temperatures (-40\u00b0C)\r\n \u2014 Very hard and stiff\r\n \u2014 Easy to color\r\n \u2014 Heat deflection temperature up to 100 \u00b0C\r\n \u2014 Very good sliding and wear characteristics\r\n \u2014 Excellent chemical resistance to fuels, solvents, strong alkalis.\r\n \u2014 Excellent resilience\r\n \u2014 Low moisture absorption\r\n \u2014 Resistance to stress cracking\r\n\r\n\r\nExisting POM C grade groups\r\n\r\nbase grades\r\nhigh-flow\r\nextrusion\r\nreinforced with glass fiber and glass beads\r\nwith improved tribological characteristics (low coefficient of friction and high wear resistance)\r\nhigh impact strength\r\nmedical grades\r\nlow odor emission\r\nwith increased resistance to aggressive cleaning agents or chlorinated water\r\nresistant to hot diesel fuel\r\nUV-stabilized\r\nelectrically conductive\r\nwith MetaLX \u2122 metallic effect\r\n\r\n\r\nApplications:\r\n\r\nInjection molding, extrusion, centrifugal molding, physical foaming.\r\n\r\n\r\n\r\nPOM H polyacetals (Delrin)\r\n\r\nHas a higher melting temperature and higher strength, with fast molding cycles thanks to a very high degree of crystallinity, but is sensitive to hydrolysis (exposure to moisture when heated).\r\n\r\n\r\nSpecial properties:\r\n\r\n \u2014 Higher stiffness compared with POM copolymer\r\n \u2014 Excellent resilience characteristics\r\n \u2014 Very good electrical insulation properties\r\n \u2014 Absorbs virtually no moisture\r\n \u2014 Higher resistance to chemicals (pH 4 - 9)\r\n \u2014 May exhibit crystalline shrinkage during molding, which must be taken into account when designing molds\r\n\r\n\r\nPossible uses of POM H\r\n\r\nSliding elements, gears, control cams, snap-fit joints, machine and mechanism components.","link":"https:\/\/materialwizard.com.ua\/en\/pom\/","name":"Polyoxymethylene (POM)","slug":"pom","taxonomy":"category","parent":0,"meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Polyoxymethylene (POM) Polyacetals \u2014 Material Wizard<\/title>\n<meta name=\"description\" content=\"Exaform POM polyacetals (polyoxymethylene): high rigidity, low friction, dimensional stability. 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