象限EPP semitron®ESD 225，挤压，静电耗散缩醛（ASTM产品数据表）
类别：聚合物；热塑性；聚甲醛（POM）；乙缩醛共聚物，无筋
特点：防静电，耐有机溶剂，滑动性良好，不吸水，硬度高。
用途：测试机架，消除静电。
物性表：
图：特点：防静电，耐有机溶剂，滑动性良好，不吸水，硬度高。
用途：测试机架，消除静电。
物性表：
| Physical Properties | Metric | English | Comments | ||
|---|---|---|---|---|---|
| Specific Gravity | 1.33 g/cc | 1.33 g/cc | ASTM D792 | ||
| Water Absorption | 2.0 % | 2.0 % | Immersion, 24hr; ASTM D570(2) | ||
| Water Absorption at Saturation | 8.0 % | 8.0 % | Immersion; ASTM D570(2) | ||
| Mechanical Properties | Metric | English | Comments | ||
| Hardness, Rockwell M | 50 | 50 | ASTM D785 | ||
| Hardness, Rockwell R | 108 | 108 | ASTM D785 | ||
| Hardness, Shore D | 76 | 76 | ASTM D2240 | ||
| Tensile Strength | 37.2 MPa | 5400 psi | ASTM D638 | ||
| Elongation at Break | 15 % | 15 % | ASTM D638 | ||
| Tensile Modulus | 1.38 GPa | 200 ksi | ASTM D638 | ||
| Flexural Strength | 50.3 MPa | 7300 psi | ASTM D790 | ||
| Flexural Modulus | 1.52 GPa | 220 ksi | ASTM D790 | ||
| Compressive Strength | 55.2 MPa | 8000 psi | 10% Def.; ASTM D695 | ||
| Compressive Modulus | 1.21 GPa | 175 ksi | ASTM D695 | ||
| Shear Strength | 41.4 MPa | 6000 psi | ASTM D732 | ||
| Izod Impact, Notched | 0.801 J/cm | 1.50 ft-lb/in | ASTM D256 Type A | ||
| Coefficient of Friction, Dynamic | 0.29 | 0.29 | Dry vs. Steel; QTM55007 | ||
| K (wear) Factor | 60.4 x 10-8 mm³/N-M | 30.0 x 10-10 in³-min/ft-lb-hr | QTM 55010 | ||
| Limiting Pressure Velocity | 0.0701 MPa-m/sec | 2000 psi-ft/min | 4:1 safety factor; QTM 55007 | ||
| Electrical Properties | Metric | English | Comments | ||
| Surface Resistivity per Square | 1.00e+9 - 1.00e+10 ohm | 1.00e+9 - 1.00e+10 ohm | EOS/ESD S11.11 | ||
| Dielectric Constant | 4.31 @Frequency 1e+6 Hz |
4.31 @Frequency 1e+6 Hz |
ASTM D150 | ||
| Dissipation Factor | 0.036 @Frequency 1e+6 Hz |
0.036 @Frequency 1e+6 Hz |
ASTM D150 | ||
| Thermal Properties | Metric | English | Comments | ||
| CTE, linear | 167 µm/m-°C @Temperature -40.0 - 149 °C |
93.0 µin/in-°F @Temperature -40.0 - 300 °F |
ASTM E831 | ||
| Melting Point | 160 °C | 320 °F | Crystalline, Peak; ASTM D3418 | ||
| Maximum Service Temperature, Air | 82.2 °C | 180 °F | Long Term | ||
| Deflection Temperature at 1.8 MPa (264 psi) | 107 °C | 225 °F | ASTM D648 | ||
| Flammability, UL94 | HB | HB | 1/8 inch (Estimated Rating) | ||
| Compliance Properties | Metric | English | Comments | ||
| 3A-Dairy | No | No | |||
| Canada AG | No | No | |||
| FDA | No | No | |||
| NSF | No | No | |||
| USDA | No | No | |||
| USP Class VI | No | No | |||
| Chemical Resistance Properties | Metric | English | Comments | ||
| Acids, Strong (pH 1-3) | Unacceptable | Unacceptable | |||
| Acids, Weak | Limited | Limited | |||
| Alcohols | Acceptable | Acceptable | |||
| Alkalies, Strong (pH 11-14) | Unacceptable | Unacceptable | |||
| Alkalies, Weak | Acceptable | Acceptable | |||
| Chlorinated Solvents | Limited | Limited | |||
| Conductive / Static Dissipative | Yes | Yes | |||
| Continuous Sunlight | Limited | Limited | |||
| Hot Water / Steam | Limited | Limited | |||
| Hydrocarbons - Aliphatic | Acceptable | Acceptable | |||
| Hydrocarbons - Aromatic | Acceptable | Acceptable | |||
| Inorganic Salt Solutions | Acceptable | Acceptable | |||
| Ketones, Esters | Acceptable | Acceptable | |||
| De |
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| Machinability | 1 | 1-10, 1=Easier to Machine | |||
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