类别：聚合物；热塑性；聚甲醛（POM）；缩醛均聚物，无筋
POM均聚物结晶度高、搞蠕变性、热膨胀率更低、耐磨性、机械强度、刚性、热变形温度等比共聚甲醛好。
物性表：| Physical Properties | Metric | English | Comments | ||
|---|---|---|---|---|---|
| Specific Gravity | 1.41 g/cc | 1.41 g/cc | ASTM D792 | ||
| Water Absorption | 0.20 % | 0.20 % | Immersion, 24hr; ASTM D570(2) | ||
| Water Absorption at Saturation | 0.90 % | 0.90 % | Immersion; ASTM D570(2) | ||
| Mechanical Properties | Metric | English | Comments | ||
| Hardness, Rockwell M | 89 | 89 | ASTM D785 | ||
| Hardness, Rockwell R | 122 | 122 | ASTM D785 | ||
| Hardness, Shore D | 86 | 86 | ASTM D2240 | ||
| Tensile Strength | 75.8 MPa | 11000 psi | ASTM D638 | ||
| Elongation at Break | 30 % | 30 % | ASTM D638 | ||
| Tensile Modulus | 3.10 GPa | 450 ksi | ASTM D638 | ||
| Flexural Strength | 89.6 MPa | 13000 psi | ASTM D790 | ||
| Flexural Modulus | 3.10 GPa | 450 ksi | ASTM D790 | ||
| Compressive Strength | 110 MPa | 16000 psi | 10% Def.; ASTM D695 | ||
| Compressive Modulus | 3.10 GPa | 450 ksi | ASTM D695 | ||
| Shear Strength | 62.1 MPa | 9000 psi | ASTM D732 | ||
| Izod Impact, Notched | 0.534 J/cm | 1.00 ft-lb/in | ASTM D256 Type A | ||
| Coefficient of Friction, Dynamic | 0.25 | 0.25 | Dry vs. Steel; QTM55007 | ||
| K (wear) Factor | 403 x 10-8 mm³/N-M | 200 x 10-10 in³-min/ft-lb-hr | QTM 55010 | ||
| Limiting Pressure Velocity | 0.0946 MPa-m/sec | 2700 psi-ft/min | 4:1 safety factor; QTM 55007 | ||
| Electrical Properties | Metric | English | Comments | ||
| Surface Resistivity per Square | >= 1.00e+13 ohm | >= 1.00e+13 ohm | EOS/ESD S11.11 | ||
| Dielectric Constant | 3.7 @Frequency 1e+6 Hz |
3.7 @Frequency 1e+6 Hz |
ASTM D150 | ||
| Dielectric Strength | 17.7 kV/mm | 450 kV/in | Short Term; ASTM D149 | ||
| Dissipation Factor | 0.0050 @Frequency 1e+6 Hz |
0.0050 @Frequency 1e+6 Hz |
ASTM D150 | ||
| Thermal Properties | Metric | English | Comments | ||
| CTE, linear | 84.6 µm/m-°C @Temperature -40.0 - 149 °C |
47.0 µin/in-°F @Temperature -40.0 - 300 °F |
ASTM E831 | ||
| Thermal Conductivity | 0.360 W/m-K | 2.50 BTU-in/hr-ft²-°F | ASTM F433 | ||
| Melting Point | 175 °C | 347 °F | Crystalline, Peak; ASTM D3418 | ||
| Maximum Service Temperature, Air | 82.2 °C | 180 °F | Long Term | ||
| Deflection Temperature at 1.8 MPa (264 psi) | 121 °C | 250 °F | ASTM D648 | ||
| Flammability, UL94 | HB | HB | 1/8 inch (Estimated Rating) | ||
| Compliance Properties | Metric | English | Comments | ||
| 3A-Dairy | No | No | |||
| Canada AG | Yes | Yes | |||
| FDA | Yes | Yes | Natural Only | ||
| NSF | Yes | Yes | STD 51 & 61 | ||
| USDA | Yes | Yes | |||
| 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 | No | No | |||
| 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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