| Description | Specification |
|---|---|
| Compressive Yield Strength | 16000 psi |
| CTE, linear 20°C | 40.5 µin/in-°F |
| Deflection Temperature at 1.8 MPa (264 psi) | 188 °F |
| Density | 0.0426 lb/in³ |
| Dielectric Constant | 3.2 |
| Dielectric Strength | 732 kV/in |
| Electrical Resistivity | 1.00E+14 ohm-cm |
| Elongation at Break | 6 % |
| Flexural Yield Strength | 16000 psi |
| Hardness, Rockwell R | — |
| Izod Impact, Notched | 0.3 ft-lb/in |
| Izod Impact, Unnotched | 5.06 ft-lb |
| Max Service Temperature, Air | 186 °F |
| Melt Flow | 6.2 g/10 min |
| Modulus of Elasticity | 450 ksi |
| Specific Heat Capacity | 0.359 BTU/lb-°F |
| Tensile Strength, Ultimate | 9960 psi |
| Tensile Strength, Yield | 10700 psi |
| Thermal Conductivity | 1.39 BTU-in/hr-ft²-°F |
| Water Absorption | 0.85 % |
Acrylic, General Purpose, Molded (PMMA)
High-performance engineering thermoplastic for precision plastic components
Acetal homopolymer (POM), commonly known by trade names such as Delrin, is a high-performance engineering thermoplastic used in applications requiring strength, low friction, and dimensional stability.
At Eck Plastic Arts, acetal is frequently selected for precision parts such as gears, bushings, and structural components where long-term performance and tight tolerances are critical.
Benefits of Acetal Homopolymer (POM)
Acetal homopolymer is widely used due to its balanced mechanical and physical properties, making it suitable for both structural and moving components.
Key benefits include:
- High stiffness and strength
- Low coefficient of friction
- Excellent dimensional stability
- Low moisture absorption
- Good wear resistance
- Reliable performance in moderate temperature environments
These characteristics make acetal especially effective in applications involving repeated motion and mechanical contact.
For projects where material performance must align with process requirements, selecting the right resin early is critical.
Common Applications of Acetal Parts
Acetal is commonly used across industries where precision and durability are required.
Typical applications include:
- Gears and gear assemblies
- Bushings and bearings
- Conveyor system components
- Automotive components, including fuel system parts
- Seatbelt and safety components
- Medical device components
Its low friction and stability make it particularly well-suited for precision moving parts and long-life components.
Depending on part geometry, wall thickness, and production requirements, these components may also be supported by Eck’s broader manufacturing capabilities.
Acetal vs. Other Engineering Plastics
Material selection depends on the specific performance requirements of the application.
Acetal vs Nylon
Acetal vs Polycarbonate
Acetal vs Nylon
- Nylon offers higher toughness
- Acetal provides better dimensional stability
- Acetal performs better in humid or wet environments
Acetal vs Polycarbonate
- Polycarbonate has higher impact resistance
- Acetal offers better wear resistance and lower friction
- Acetal is better suited for precision mechanical parts
Acetal provides a balanced combination of strength, stability, and wear performance, making it a reliable choice for many engineering applications.
For customers evaluating multiple material options, Eck Plastic Arts can help identify the most economical and technically suitable fit for the application.
Design Guidelines for Acetal Parts
Proper part design is critical to achieving optimal performance and manufacturability.
Recommended design considerations:
- Wall thickness: 0.030″ – 0.125″
- Use ribs (40–50% of wall thickness) for added strength
- Avoid sharp corners to reduce stress concentration
- Apply draft angles of 0.5° – 1° per side
- Use metal threaded inserts instead of thread-forming screws
Following these guidelines helps ensure consistent quality, durability, and production efficiency.
If your part requires support beyond material selection, Eck Plastic Arts also provides design-informed manufacturing support across multiple processes.
Material Properties of Acetal Homopolymer
For additional engineering reference across other thermoplastics, users can explore Eck’s broader materials library.
Materials Specifications List
Material Selection Support
Choosing the right material depends on performance requirements, environmental conditions, and cost considerations.
Eck Plastic Arts works closely with customers to evaluate:
- Mechanical load requirements
- Environmental exposure (heat, moisture, chemicals)
- Friction and wear conditions
- Production volume and cost targets
This helps ensure the selected resin matches both the application and the manufacturing method.
