Acetal copolymer is a family of engineering thermoplastics based on formaldehyde polymerization technologies. Acetals have an exceptional balance of tensile properties, shear strength, stiffness and toughness. They are natural bearing materials because they exhibit a very low friction coefficient against metals, acetal and other plastics. Some of the trade names associted with Acetals are Acetron®, Delrin®, Celcon®, Ensital® SD, Ertacetal®, Pomalux®, Semitron® ESD, SUSTARIN®, TECAFORM® and Ultraform®. Delrin® is the most common brand name for the homopolymer acetal and is a highly versatile engineering plastic with metal like properties.
CCT Precision Machining is an industry leader in Delrin® and Acetals machining. We are able to maintain tolerances, create features and produce parts that even the material manufacturers deem impossible. By using high speed spindles capable of turning at 30,000 RPM, tightly controlled work envelopes and cutting edge work holding systems, CCT Precision can machine thermoplastic components from the most simple part to the most intricate part on any of the 25+ machines in our facility.
- 27” x 15” x 13” Work Envelope
- Tolerances to +/- .00025” (0.006 mm)
- Hole Diameters to 0.003” (0.076 mm)
If precision machining of Delrin® parts is what you are looking for, Request a Quote today.
| Acetron GP Acetal | Delrin Acetal | Delrin 570 Blend | 25% Glass-Filled Acetal Copolymer | Delrin AF-Filled Acetal | Acetron NS-Filled Acetal | Delrin 500 CL | |||
| Mechanical | ASTM Test Method | Polyoxy-methylene Copolymer | Polyoxy-methylene Homopolymer | 20% Glass-Filled POM Homopolymer | 25% Glass-Filled POM Homopolymer | PTFE-Filled POM Homopolymer | Lubricated POM Copolymer | Lubricated POM Homopolymer | Units |
|---|---|---|---|---|---|---|---|---|---|
| Strength to Weight Ratio | - | - | - | - | - | - | - | - | ksi |
| Specific Gravity @73 F | D792 | 1.41 | 1.41 | 1.56 | 1.59 | 1.50 | 1.44 | 1.42 | - |
| Tensile Strength @73 F, (ult)/(yld) | D638 | 9,500 (ult) | 11,000 (ult) | 8,500 (ult) | 16,000 (yld) | 8,000 (ult) | 7,500 (ult) | 9,500 (yld) | psi |
| Tensile Modulus of Elasticity @73 F | D638 | 400,000 | 450,000 | 900,000 | 1,200,000 | 435,000 | 400,000 | 450,000 | psi |
| Tensile Elongation at Break @73 F | D638 | 30 | 30 | 12 | 2-3% | 15 | 10 | 40 | % |
| Flexural Strength @73 F | D790 | 12,000 | 13,000 | 10,700 | - | 12,000 | 15,000 | 13,000 | psi |
| Flexural Modulus of Elasticity @73 F | D790 | 400,000 | 450,000 | 730,000 | 1,050,000 | 445,000 | 400,000 | 400,000 | psi |
| Shear Strength @73 F | D732 | 8,000 | 9,000 | - | - | 76,000 | 6,000 | - | psi |
| Comprehensive Strength, (% Deformation) @73 F | D695 | 15,000 (10) | 16,000 (10) | - | - | 16,000 (10) | 15,000 (10) | 4,500 (10) | psi |
| Comprehensive Modulus of Elasticity @73 F | D695 | 400,000 | 450,000 | - | - | 350,000 | 315,000 | - | psi |
| Hardness, Rockwell, Scale as noted @73 F | D785 | M88 (R120) | M89 (R122) | M90 (R118) | M80 | M85 (R115) | M85 (R116) | M90 (R120) | - |
| Hardness, Durometer, Shore D @73 F | D2240 | D85 | D86 | - | - | D83 | D83 | - | - |
| Izod Impact, (Notched) @73 F | D256 Type A | 1.0 | 1.0 | 0.8 | 1.1 | 0.7 | 0.7 | 1.4 | ft-lb/in of notch |
| Coefficient of Friction, (Dry vs Steel) Dynamic | - | 0.25 | 0.25 | 0.34 | - | 0.19 | 0.20 | - | - |
| Limiting PV, (with 4 to 1 factor of safety applied) | - | 2,700 | 2,700 | - | - | 7,500 | 7,500 | - | psi-ft/min |
| Thermal | ASTM Test Method | Polyoxy-methylene Copolymer | Polyoxy-methylene Homopolymer | 20% Glass-Filled POM Homopolymer | 25% Glass-Filled POM Homopolymer | PTFE-Filled POM Homopolymer | Lubricated POM Copolymer | Lubricated POM Homopolymer | Units |
|---|---|---|---|---|---|---|---|---|---|
| Coefficient of Linear Thermal Expansion @73 F | E-831 (TMA) | 5.4E-04 | 4.7E-05 | 4.5E-05 | 2.2E-05 | 5.0E-05 | 4.7E-05 | 6.8E-05 | in/in/F |
| Heat Deflection Temperature @264 psi | D648 | 220 | 250 | 316 | 322 | 244 | 250 | 257 | F |
| Tg-Glass transition termperature, (Amorphous) | D3418 | - | - | - | - | - | - | - | F |
| Melting Point, (VS=Vicat Softening Temp.) | D3418 | 335 | 347 | 347 | - | 347 | 347 | 347 | F |
| Continuous Service Temperature in Air, (Max.) | - | 180 | 180 | 185 | - | 180 | 180 | - | F |
| Thermal Conductivity | - | 1.60 | 2.5 | - | - | - | - | - | BTU-in / hr-ft2-F |
| Electric | ASTM Test Method | Polyoxy-methylene Copolymer | Polyoxy-methylene Homopolymer | 20% Glass-Filled POM Homopolymer | 25% Glass-Filled POM Homopolymer | PTFE-Filled POM Homopolymer | Lubricated POM Copolymer | Lubricated POM Homopolymer | Units |
|---|---|---|---|---|---|---|---|---|---|
| Dielectric Strength, Short Term | D149 | 420 | 450 | 490 | - | 400 | 350 | 400 | Volts/mil |
| Volume Resistivity | D257 | 1.0E+17 | 1.0E+15 | 5.0E+14 | - | 3.0E+16 | 1.0E+15 | 1.0E+15 | ohm-cm |
| Dielectric Constant @10E6 Hz | D150 | 3.8 | 3.7 | - | - | 3.1 | - | 3.5 | - |
| Dissipation Factor @10E6 Hz | D150 | 0.005 | 0.005 | 0.006 | - | 0.010 | - | 0.006 | - |
| Flammability @3.1 mm unless noted | UL94 | HB | HB | HB | - | HB | HB | HB (0.78mm) | - |
| H2O | ASTM Test Method | Polyoxy-methylene Copolymer | Polyoxy-methylene Homopolymer | 20% Glass-Filled POM Homopolymer | 25% Glass-Filled POM Homopolymer | PTFE-Filled POM Homopolymer | Lubricated POM Copolymer | Lubricated POM Homopolymer | Units |
|---|---|---|---|---|---|---|---|---|---|
| Water Absorption, Immersion, 24 hours | D570(7) | 0.20 | 0.20 | 0.25 | 0.29 | 0.20 | 0.20 | 0.27 | % by weight |
| Water Absorption, Saturation | D570(7) | 0.90 | 0.90 | 1.00 | - | 1.0 | 0.90 | 0.90 | % by weight |