POM-H (acetal homopolymer, polyoxymethylene homopolymer) is a highly crystalline engineering thermoplastic within the acetal family. Produced by polymerizing formaldehyde into long, uniform chains, POM-H achieves higher crystallinity than POM-C (copolymer) grades, which translates directly into superior mechanical performance. Ready Plastics stocks POM-H acetal in sheet, rod, and tube for demanding precision, automation, and structural applications.
POM-H delivers 7,600 psi tensile strength, 12,000 psi flexural strength, and a flexural modulus of 435,000 psi — making it notably stiffer and stronger than copolymer acetal. Its short-term service temperature reaches 300°F (150°C), with a heat deflection temperature of 285°F (141°C). Very low water absorption (0.05% at 24h / 0.1% at 96h) ensures outstanding dimensional stability in humid environments. These properties make POM-H the material of choice for high-cycle precision components, load-bearing parts, and applications where fatigue resistance is critical.
Modified grades. Ready Plastics extends the POM-H line with specialty variants for application-specific performance. POM-H GF20 adds 20% glass fiber reinforcement to significantly increase stiffness and reduce thermal expansion — the choice for structural components under sustained load. POM-H PTFE incorporates PTFE to reduce friction and extend wear life in high-load sliding assemblies. POM-H UV is UV-stabilized for outdoor and exposed environments where prolonged sunlight exposure would otherwise degrade the base polymer.
POM-H vs POM-C. Choose POM-H when your application requires maximum strength, stiffness, or fatigue endurance — for example, precision gears, high-load bushings, tooling components, and automation parts in demanding cycles. For general-purpose machining, chemical resistance, or applications in wet environments, POM-C (Acetal Copolymer) remains the preferred starting point. Both grades machine excellently on standard CNC equipment and hold tight dimensional tolerances in service.
