Driven by the need for weight reduction and cost savings, the shift toward plastic materials is accelerating. Among these, “POM (polyacetal)” is widely used for sliding parts and precision components. In this article, we explain the properties, applications, grade differences, and selection points of POM resin.

What Is POM?

POM is a thermoplastic resin mainly composed of polyoxymethylene. It is also known as “polyacetal” or “acetal resin.” As one of the five major general-purpose engineering plastics, it offers excellent mechanical properties, wear resistance, and dimensional stability. With high rigidity, light weight, and excellent machinability, POM is used across a wide range of industries, including automotive parts, electrical and electronic equipment, and precision machinery.

Key Features of POM

POM has many characteristics suitable for precision components:

・Excellent sliding performance due to low friction and self-lubricating properties
・High rigidity
・Superior wear resistance and fatigue resistance
・Low water absorption (approx. 0.22%), ensuring high dimensional stability
・Heat resistance: approx. 90–100°C
・Excellent machinability

These properties make it ideal for parts that require repeated motion, long-term use, and high precision. We compared the properties of MC nylon and POM, two common general-purpose engineering plastics.

Selection guidelines:

Prioritize sliding performance and dimensional stability → POM
Prioritize impact resistance and heat resistance → MC Nylon

Typical Applications

POM is widely used in the following applications:
・Mechanical components such as gears, cams, and bearings
・Electrical and electronic parts
・Semiconductor equipment components
・Food processing machinery and conveying systems

There are also grades compliant with food safety standards (USA: FDA / EU: 10/2011 / Japan: Food Sanitation Act), making POM suitable for use in food-related equipment.

Grade Differences (POM-H and POM-C)

POM resin is mainly classified into two types:

■ POM-H (Homopolymer)
Composed of a single monomer with high crystallinity
Excellent strength, rigidity, and wear resistance
Suitable for precision mechanical components

■ POM-C (Copolymer)
Composed of multiple monomers
Excellent flexibility and chemical resistance
Good impact resistance and dimensional stability

Based on our experience, copolymer (POM-C) offers advantages in availability and cost, making it the more commonly used option.

Depending on the application, the following functional grades are also available:
・Sliding grades (reduced friction)
・Conductive grades (anti-static properties)

Design Considerations
Although POM is an excellent material, the following points should be considered:

・Flame resistance: UL94-HB (relatively flammable)
・Weather and UV resistance: not high; not suitable for long-term outdoor or direct sunlight exposure

Therefore, for outdoor applications or when flame resistance is required, alternative materials should also be considered.

Technoplast (Thailand)’s Capabilities

We supply a wide range of engineering plastics, including POM. For POM, we mainly stock copolymer grades (POM-C) in Thailand and ensure a stable supply of materials from manufacturers in Europe, the United States, Japan, and Korea. We also provide one-stop services including machining. We can propose the most suitable material based on your application, required precision, and budget.

If you are looking for general-purpose plastic components such as POM in Thailand, please feel free to contact us via the form below.