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Acetals have a unique balance of physical properties not available with metals and most other plastics. Acetals absorb a minimal amount of moisture, and their physical properties remain constant in a variety of environments. Low moisture absorption gives excellent dimensional stability for close-tolerance machined parts. Acetal is ideally suited for close tolerance mechanical parts and electrical insulators which require strength and stiffness. Acetal shapes are produced from copolymer (Celcon®) and homopolymer (Delrin®) resins which provide a high modulus of elasticity coupled with great strength, stiffness, and toughness. They are also characterized by a low coefficient of friction and good bearing charcteristics.
Delrin® AF is a unique thermoplastic consisting of oriented fibers uniformly dispersed in Acetal resin. This combination produces a material with higher surface lubricity than unmodified acetal, while retaining acetal's strength, dimensional stability, and toughness.
| Acetal Properties | ||||||||
|---|---|---|---|---|---|---|---|---|
| Property | ASTM or UL Test | Acetal Copolymer | Delrin® Homopolymer | Delrin® AF PTFE-Filled | ||||
| Water Absorption (24hrs) | (%) | D-570 | 0.2 | 0.2 | 0.2 | |||
| Density | (lb/in³) | D-792 | 0.051 | 0.051 | 0.054 | |||
| (g/cm³) | 1.41 | 1.41 | 1.50 | |||||
| IZOD Notched Impact | (ft-lb/in) | D-256 | 1.0 | 1.0 | 0.7 | |||
| Tensile Strength | (psi) | D-638 | 9,500 | 11,000 | 8,000 | |||
| Tensile Modulus | (psi) | D-638 | 400,000 | 450,000 | 435,000 | |||
| Tensile Elongation at Break | (%) | D-638 | 30 | 30 | 15 | |||
| Hardness | (Rockwell R) | D-785 | M88 / R120 | M89 / R122 | M85 / R115 | |||
| Compressive Strength | (psi) | D-695 | 15,000 | 16,000 | 16,000 | |||
| Compressive Modulus | (psi) | D-695 | 400,000 | 450,000 | 350,000 | |||
| Flexural Strength | (psi) | D-790 | 12,000 | 13,000 | 12,000 | |||
| Flexural Modulus | (psi) | D-790 | 400,000 | 450,000 | 435,000 | |||
| Thermal Conductivity | (BTU-in/ft²-hr-°F) | C-177 | 1.6 | 2.5 | - | |||
| (x 104 cal/cm-sec-°C) | 5.5 | 8.6 | - | |||||
| Heat Deflection Temp at 264 psi | (°F / °C) | D-648 | 220 / 104 | 250 / 121 | 244 / 118 | |||
| Coefficient of Linear Thermal Expansion | (x 10-5 in./in./°F) | D-696 | 5.40 | 4.70 | 5.00 | |||
| Flammability Rating | UL-94 | H-B | H-B | H-B | ||||
| Melting Temperature | (°F / °C) | D-3418 | 335 / 168 | 347 / 175 | 347 / 175 | |||
| Max Operating Temp | (°F / °C) | - | 180 / 82 | 180 / 82 | 180 / 82 | |||
| Dialectric Strength, 1/8" thick | (V/mil) | D-149 | 420 | 450 | 400 | |||
| Dialectric Constant at 1 MHz | D-150 | 3.8 | 3.7 | 3.1 | ||||
| Dissipation Factor at 1 MHz | D-150 | 0.005 | 0.005 | 0.010 | ||||
| Volume Resistivity at 50% RH | (ohm-cm) | D-257 | 1015 | 1015 | 3.0 x 1016 | |||
| Physical | Mechanical | Thermal | Electrical | |||||