Why Polyoxymethylene (POM) Is the Go-To Engineering Plastic for Precision Parts
Introduction
Polyoxymethylene (POM), also known as acetal, polyacetal, or polyformaldehyde, is a high-performance engineering thermoplastic recognized for its outstanding mechanical strength, dimensional stability, and low friction. It's commonly used in precision components that require high stiffness, minimal wear, and long-term durability.
Whether in automotive gears or electrical connectors, POM delivers functional precision and structural reliability.
Key Features & Benefits
Excellent Mechanical Strength
High tensile and impact strength
Suitable for load-bearing and structural components
Low Coefficient of Friction
Self-lubricating properties
Ideal for sliding and rotating parts like gears and bushings
Dimensional Stability
Low water absorption
Maintains shape and size under varying environmental conditions
Superior Chemical Resistance
Resists fuels, solvents, oils, and weak acids
Compatible with automotive and industrial fluids
Easy Machinability
Cuts and drills cleanly
Preferred for CNC machining and injection molding
Common Applications of POM
| Industry | Component Examples |
|---|---|
| Automotive | Gears, fuel system parts, door handles |
| Electronics | Connectors, switches, insulators |
| Consumer Goods | Zippers, buckles, watch straps |
| Industrial | Bearings, cams, conveyor parts |
| Medical Devices | Inhalers, insulin pen parts, dental tools |
Material Comparison: POM vs. Other Engineering Plastics
| Property | POM | PA (Nylon) | ABS | PET |
|---|---|---|---|---|
| Stiffness | High | Medium | Medium | High |
| Water Absorption | Low | High | Low | Medium |
| Machinability | Excellent | Good | Fair | Fair |
| Wear Resistance | Excellent | Good | Poor | Good |
| Temperature Resistance | Up to 120°C | Up to 100°C | Up to 80°C | Up to 115°C |
Processing & Manufacturing Notes
Processing method: Injection molding, extrusion, CNC machining
Drying before processing: Usually not required (low moisture absorption)
Molding temperature: 190–230°C
Shrinkage rate: 2.0%–2.4%
Limitations of POM
Poor UV resistance (requires stabilization or coatings)
Not suitable for strong acids and bases
Flammable without flame-retardant additives
Limited paint adhesion
Frequently Asked Questions
Q: Can POM be used in food-grade applications?
A: Yes, certain POM grades comply with FDA and EU food contact regulations, making them suitable for kitchen tools, food dispensers, and beverage valves.
Q: How does POM perform in cold environments?
A: POM maintains its toughness and dimensional stability even at low temperatures, making it excellent for outdoor or refrigerated applications.
Q: Is POM recyclable?
A: Yes. POM scrap can be reused in some industrial processes, although it is not commonly recycled in standard post-consumer systems.
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