Polyoxymethylene (POM / Acetal)
A high-precision engineering thermoplastic known for its exceptional stiffness, low friction, and dimensional accuracy, widely used in automotive mechanical components.
Overview
Polyoxymethylene (POM), also known as acetal or Delrin™, is a semi-crystalline engineering thermoplastic with outstanding mechanical stiffness, low coefficient of friction, excellent fatigue resistance, and high dimensional accuracy. It maintains its properties across a wide temperature range and resists fuels, oils, and solvents. In automotive engineering, POM is the material of choice for precision mechanical components requiring tight tolerances: fuel system parts, door lock mechanisms, gear wheels, bushings, clips, and sliding elements. Its self-lubricating nature makes it ideal for metal replacement in moving components, reducing weight and eliminating the need for lubrication.
Automotive Applications
Similar Materials
High Density Polyethylene (HDPE)
Thermoplastic
High Density Polyethylene (HDPE) is a versatile thermoplastic polymer produced from ethylene with a high strength-to-density ratio.
Acrylonitrile Styrene Acrylate (ASA)
Engineering Thermoplastic
A UV- and weathering-resistant engineering thermoplastic used for exterior automotive components exposed to outdoor environments.
Kevlar
Aramid Fiber
Aramid fiber with exceptional strength and heat resistance
Nylon Carbon Fibre (PA12/CF)
Short Fibre Reinforced Thermoplastic
A high-performance thermoplastic composite combining polyamide 12 (PA12) nylon with short or continuous carbon fibre reinforcement, offering an excellent balance of strength, chemical resistance, and processability.
Properties
Category
Type
Engineering Thermoplastic
Available Colors
Available Forms
Key Properties
- High stiffness
- Excellent dimensional stability
- Low coefficient of friction
- Self-lubricating
- Fatigue resistant
- Chemical resistant
Technical Specifications
Density
1.41–1.42 g/cm³
Tensile Strength
60–70 MPa
Temperature Resistance
–40°C to +120°C continuous
Sustainability
Sustainability Rating
POM is technically recyclable but degrades through repeated processing. Its metal-replacement capability reduces overall component weight and extends service life.