POM plastic (polyoxymethylgene)

Polyoxymethylgene (POM), also called acetal, is available both as a homopolymer and a copolymer and is often used in pump impellers, sliding bearings, and precision mechanical components. Like many other semi-crystalline thermpoplastics, POM can be processed in several ways.

POM-C MD FG plastic

POM-H TF plastic

POM-H plastic

POM-C plastic

What is POM and why is it called acetal plastic?

Polyoxymethylene (POM) is a semi-crystalline thermoplastic available in two variants: homopolymer (for example, Delrin) and copolymer (for example, Acetal). Both are closely related and are often used interchangeably in industry, as their properties are similar but differ in certain technical details.

POM is sometimes called acetal plastic because the polymer is made up of acetal groups, which gives the material its alternative name. Among the most common trade names are Delrin for the homopolymer and Acetal for the copolymer. The material is naturally white but is available in many colors and is known for being very easy to machine as well as dimensionally stable.

Strengths and capabilities of POM plastic

Properties

POM is characterized by high stiffness, toughness and fatigue strength. The material is used in applications where dimensional accuracy, strength, and durability are required. It has good spring-like properties, making it suitable for sliding bearings, pump impellers, and precision components. Its low water absorption contributes to dimensional stability and shape retention, which distinguishes POM from materials such as polyamide (nylon).

Processing methods

The material can be processed through injection molding, extrusion, vacuum metallization, electroplating, welding and plastic machining, and is also suitable for automatic turning. The copolymer is resistant to alkaline environments up to pH 14, and products are often used in the temperature range of -50°C to approximately +105°C, depending on stabilization and component requirements. POM’s low friction and wear resistance make it a common choice for moving and loaded machine parts.

POM plastic for the food industry (POM-C FG)

Acetal polyoxymethylene (POM-C FG) is a type of plastic that is safe for use with food because it is non-porous and more resistant to strong bases, water, and heat than standard acetal plastic.

The material has low moisture absorption and good machinability, making it suitable for a wide range of applications. It meets important standards, such as FDA 21 CFR § 177.2470, EU 10/2011, USDA, NSF, Canada AG, and 3A Dairy requirements.

Difference between various POM plastics

  • POM-H plastic

  • POM-H plastic is a homopolymer with higher crystallinity, which provides greater stiffness, hardness, and mechanical strength over short periods. It is used when high load capacity and strength are prioritized but is less resistant to chemicals and high temperatures.

  • POM-C plastic

  • POM-C plastic is a copolymer with a lower melting point but better chemical resistance, particularly against warm water and alkalis. It is slightly less stiff than POM-H but withstands prolonged exposure to stress.

  • POM-H TF plastic

  • POM-H TF plastic is a thermally stabilized version of the homopolymer with enhanced properties for applications involving higher temperatures and thermal stress.

  • POM-C MD FG plastic

  • POM-C MD FG plastic is a food-grade variant approved according to several global standards. It is non-porous and well suited for components in contact with food and beverages.

Common applications for POM plastic

Few materials are as versatile as POM plastic. Its strength, stiffness, and dimensional stability make it common in the automotive, electronics, and medical technology sectors. Some example products include:

  • Gears and pump impellers
  • Guides, rails, and rollers
  • Snap lids and valve blocks
  • Pallets and fixtures

Limitations of POM plastic – when to avoid it

POM should be avoided in environments with strong and prolonged UV exposure, as it can degrade. It is not suitable for hot water applications or where the material is exposed to high temperature cycles beyond its limits. The material can also be sensitive to impact and cracking under concentrated stresses or sharp corners.

Why choose our POM plastic

Carlsson & Möller offers high-quality POM plastic with consistent performance. Our products are designed for demanding industrial environments and are available in several variants to meet different technical and hygienic requirements. We ensure that every delivery complies with applicable standards, providing solid support to help you find the right material solution.

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Common questions about POM plastic

  • What is the difference between POM-H and POM-C?

  • POM-H is stiffer and harder but less resistant to chemicals, while POM-C is more chemically resistant and has a longer service life at higher temperatures.

  • What temperatures can POM plastic withstand?

  • Typically between -50°C and +105°C, depending on the variant and stabilization.

  • Is POM eco-friendly?

  • POM plastic is not inherently eco-friendly, but the material is recyclable and can be melted down for reuse.

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