Summary of POM-C (Copolymer Acetal) Product Characteristics

What is POM-C?

Polyoxymethylene Copolymer (Copolymer Acetal) is one of the major types of POM, produced by copolymerizing two different monomers.

Compared to homopolymer POM (POM-H):

Better thermal stability

Wider processing window

More resistant to chemical corrosion

Less prone to decomposition

Higher cost-effectiveness

Therefore:

POM-C is the most widely used type of POM on the market today.

Core Product Characteristics of POM-C

1. High Mechanical Strength and High Rigidity

POM-C exhibits:

High strength

High hardness

High rigidity

Excellent compressive performance

Its mechanical properties are close to those of some metallic materials, which is why it is known as "Race-Steel" .

Suitable for: Structural components, Mechanical parts, Precision components

2. Excellent Wear Resistance and Self-Lubrication

One of the biggest advantages of POM-C:

Low friction coefficient

Excellent self-lubricating properties

Long wear life

High limiting PV value

Operates for long periods without additional lubrication.

Particularly suitable for: Gears, Slides, Bearings, Guide rails, Conveyor system parts

Moreover: In humid environments, POM-C offers better wear resistance than nylon.

3. Excellent Fatigue Resistance

POM-C provides:

Strong resistance to repeated impact

High fatigue resistance

Resistance to cracking under long-term cyclic use

Suitable for: Elastic snaps/clips, Spring structures, High-frequency moving parts

4. Excellent Dimensional Stability

POM-C features:

Low water absorption

Minimal influence from humidity

Stable shrinkage

Resistance to deformation

Characteristic:

Very good precision dimensional stability.

Especially suitable for: CNC machined parts, Precision automation components, Semiconductor equipment parts

5. Excellent Chemical Corrosion Resistance

POM-C is more resistant to chemical corrosion than homopolymer POM.

Resistant to:

Gasoline

Lubricating oils

Alcohols

Ethers

Weak acids

Weak bases

Also offers:

Good oil resistance

Good solvent resistance

Widely used in: Automotive fuel systems, Valve bodies, Pump bodies, Chemical equipment

6. Better Thermal Stability

Compared to POM-H:

POM-C is less prone to thermal decomposition.

Advantages:

Wider processing temperature range

Easier to injection mold

Less likely to generate formaldehyde gas

Better molding stability

Suitable for: Large-sized products, Complex structural parts, Long-duration continuous processing

7. Excellent Electrical Insulation Properties

POM-C offers:

High insulation resistance

Low dielectric loss

Arc resistance

Moreover:

Virtually unaffected by temperature and humidity.

Suitable for: Electrical insulation components, Electronic connectors, Appliance structural parts

8. Low Water Absorption Rate

POM-C has a water absorption rate of approximately: 0.22% – 0.25%

Therefore:

Resists swelling

Dimensionally stable

Stable mechanical properties

Better suited than nylon for: Humid environments, Water treatment equipment, Liquid-contact components

9. Good Processability

POM-C processing characteristics:

Easy to extrude

Easy to injection mold

Easy to machine

Smooth machined surface

Suitable for producing:

POM sheets

POM rods

POM tubes

CNC precision parts

10. Smooth Surface and High Gloss

The surface of POM-C material is:

Smooth

Dense

Low friction

Good appearance

Suitable for: Precision sliding components, Appearance structural parts, High-gloss mechanical parts

Typical Performance Parameters of POM-C

Property Typical Value

Density 1.41–1.43 g/cm³

Water Absorption 0.22–0.25%

Long-term Service Temperature -40°C ~ 100°C

Tensile Strength ≥60 MPa

Heat Deflection Temperature 100–110°C

Friction Coefficient Very low

Molding Shrinkage Rate Approx. 2%