GENERAL DESCRIPTION Acetal is the common name for a family of thermoplastics with the chemical name "PolyOxy-Methylene". Acetal is available in a general purpose copolymer grade which provides high strength and stiffness, enhanced dimensional stability, good machinability, a low coefficient of friction and good wear properties. By adding special conductive materials to the resin, the conductivity of acetal is increased to control static electricity formation or conduction.
These additives may be in the form of non-carbon alloys, carbon powder, or carbon fibers. Some properties of the original acetal copolymer are modified by the addition of fillers, but chemical resistance, strength, and manufacturability remain generally the same.
AntiStatic materials are available in NATURAL and BLACK colors, conductive material is always BLACK in color.
( see also Standard Acetal and Semitron ESd 225 Static-Dissipative Acetal )
Static Dissipative / Anti-Static (SD) :
Resistivity generally between 107 and 1012 ohms per square.
Initial electrostatic charges are suppressed.
Conductive (CN) :
Resistivity generally between 103 and 106 ohms per square.
No initial charge, provides path for charge to bleed off.
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TYPICAL PROPERTIES of POMALUX® STATIC-CONTROL ACETAL | ||||
| ASTM or UL test | Property | Pomalux® SD-A | Pomalux® CN-F | Pomalux® CN-SS |
| - | Classification | Anti-Static | Conductive | Conductive |
| - | Filler Material | Non-Carbon Alloy | Carbon Fiber | Stainless Steel |
| PHYSICAL | ||||
| D792 | Density (lb/in³) (g/cm³) |
0.047 1.30 |
0.052 1.44 |
0.054 1.50 |
| D570 | Water Absorption, 24 hrs (%) | 2.5 | 0.26 | - |
| MECHANICAL | ||||
| D638 | Tensile Strength (psi) | 6,200 | 11,000 | 8,600 |
| D638 | Tensile Modulus (psi) | - | - | - |
| D638 | Tensile Elongation at Yield (%) | 350 | 3 | - |
| D790 | Flexural Strength (psi) | 8,600 | 14,000 | 13,000 |
| D790 | Flexural Modulus (psi) | 260,000 | 1,100,000 | 400,000 |
| D695 | Compressive Strength (psi) | - | - | - |
| D695 | Compressive Modulus (psi) | - | - | - |
| D785 | Hardness, Rockwell R | - | - | - |
| D256 | IZOD Notched Impact (ft-lb/in) | 1.3 | 0.9 | 0.7 |
| THERMAL | ||||
| D696 | Coefficient of Linear Thermal Expansion (x 10-5 in./in./°F) |
6.5 | 2.6 | 4.9 |
| D648 | Heat Deflection Temp (°F / °C) at 66 psi at 264 psi |
- 192 / 89 |
- 320 / 160 |
- 225 / 107 |
| D3418 | Melting Temperature (°F / °C) | - | - | - |
| - | Max Operating Temp (°F / °C) | - | - | - |
| C177 | Thermal Conductivity (BTU-in/ft²-hr-°F) (x 10-4 cal/cm-sec-°C) |
2.1 7.2 |
- - |
- - |
| UL94 | Flammability Rating | - | - | - |
| ELECTRICAL | ||||
| D257 | Surface Resistivity (ohms/sq) | 109-1011 | 102-106 | 102-106 |
| D257 | Volume Resistivity (ohm-cm) at 73°F, 50% RH | 109-1011 | 102-106 | 102-106 |
NOTE: The information contained herein are typical values intended for reference and comparison purposes only. They should NOT be used as a basis for design specifications or quality control. Contact us for manufacturers' complete material property datasheets.POMALUX is a registered trademark of Westlake Plastic Company
All values at 73°F (23°C) unless otherwise noted.
©
Copyright Boedeker Plastics, Inc.
2008