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Acetal (also known as POM – Polyoxymethylene, or by trade names like Delrin®) is an engineering thermoplastic known for its high strength, dimensional stability, and low friction.
In valve applications, acetal is commonly used for seats, seals, bushings, and low-pressure internal components, especially where tight tolerances, and smooth operation are needed in clean, non-corrosive applications.
Properties
- High Mechanical Strength – Maintains rigidity and structure under load, useful for seats and guides.
- Low Friction & Wear Resistance – Naturally self-lubricating for low-torque, high-cycle applications.
- Excellent Machinability – Easily fabricated into precision parts with tight dimensional control.
- Good Chemical Compatibility – Resistant to fuels, oils, alcohols, and mild acids/bases.
- Dimensional Stability – Performs well in precision sealing or moving parts, especially in automated valves.
| Acetal vs. Other Valve Materials | |||
| Property | Acetal | PTFE | UHMWPE |
| Friction Coefficient | Low | Very Low | Low |
| Chemical Resistance | Moderate | Excellent | Good |
| Temperature Limit | ~110°C | ~260°C | ~80–90°C |
| Dimensional Stability | Excellent | Fair | Moderate |
| Wear Resistance | Good | Moderate | Very Good |
Limitations
- Limited Temperature Resistance – Max operating range of ~90–110°C (194–230°F); not suitable for steam or hot fluids.
- Degrades in Strong Acids or Oxidizers – Not compatible with concentrated nitric acid, chlorine, or oxidizing chemicals.
- UV Sensitivity – Can degrade under prolonged sunlight or UV exposure unless stabilized.
- Lower Pressure Capabilities – Typically restricted to low- and medium-pressure service.
Common Applications
Valve Seats – For low- to moderate-pressure ball and butterfly valves in non-aggressive media.
Bushings & Guides – Reduce wear on moving parts while lowering friction.
Stems & Inserts – In plastic or hybrid valves requiring precise movement and resistance to deformation.
Seals & Discs – In pneumatic or utility valves where chemical resistance and tight sealing are essential.