Polyoxymethylene (POM)[2]

Updated: 2026-09-15

Overview

Wear-resistant, high-temperature, and chemical-resistant POM (Polyoxymethylene) is a high-performance engineering thermoplastic known for its exceptional mechanical properties and stability under demanding conditions. It is widely used in industries requiring durable, low-friction, and dimensionally stable materials. POM is available in two primary grades: homopolymer (POM-H) and copolymer (POM-C), each tailored for specific performance needs. POM's molecular structure grants it high crystallinity, contributing to its rigidity and resistance to creep. Its ability to withstand continuous use at temperatures up to 100°C (short-term up to 140°C) makes it ideal for automotive and industrial applications. Enhanced versions with additives further improve wear resistance and chemical stability.

Physical and Chemical Properties

POM exhibits a unique combination of physical and chemical properties that make it suitable for harsh environments. Its high tensile strength (up to 70 MPa) and stiffness are complemented by low moisture absorption, ensuring dimensional stability in humid conditions. The material's low coefficient of friction (0.1–0.3) reduces wear in moving parts. Chemically, POM resists hydrocarbons, alcohols, and weak acids but degrades in strong acids, bases, and oxidizing agents. Its thermal stability allows it to maintain properties across a broad temperature range (-40°C to +100°C). UV resistance is limited, requiring stabilizers for outdoor use.

Main Applications

POM's wear and chemical resistance make it a preferred material for precision components in automotive, electronics, and consumer goods. Common applications include gears, bearings, pump housings, and electrical insulators. In automotive systems, it is used for fuel system components, seatbelt mechanisms, and door handles due to its durability and lightweight nature. Industrial uses encompass conveyor belts, valve bodies, and fittings where low friction and long service life are critical. Medical devices, such as inhalers and surgical tools, also utilize POM for its biocompatibility and sterilizability. Custom formulations with glass fibers or PTFE enhance specific properties for niche applications.

Safety and Storage

Handling POM requires precautions to avoid exposure to dust or fumes, which may irritate respiratory systems. Processing at high temperatures (e.g., injection molding) should occur in well-ventilated areas to prevent formaldehyde release. Proper PPE, including gloves and masks, is recommended during machining. Storage conditions should prioritize dryness and coolness to prevent degradation. POM pellets or sheets must be kept in sealed containers away from direct sunlight. Long-term exposure to moisture can affect processing quality, though the material itself is hygroscopically stable.

B2B Procurement Guide

When sourcing POM, prioritize suppliers with ISO certifications and material traceability. Key procurement factors include grade selection (POM-H for stiffness, POM-C for impact resistance), color options, and compliance with industry standards like FDA or EU 10/2011 for food-contact applications. Bulk pricing typically decreases for orders above 1 ton, with lead times varying by supplier location. Request technical datasheets for melt flow index (MFI) and mechanical property guarantees. For specialized requirements (e.g., anti-static or UV-stabilized grades), collaborate with manufacturers to customize formulations.