类别：聚合物；热塑性；聚甲醛（POM）；缩醛均聚物，无筋
材料说明：ertacetal H象限的均聚缩醛度。它提供了一个更高的机械强度，刚度，硬度和抗蠕变性能，以及较低的热膨胀率，往往也是一个更好的耐磨性比乙缩醛共聚物。
特性：机械强度高，硬度高，硬度高，良好的韧性，良好的抗蠕变性能，高冲击强度，即使在低温，非常好的尺寸稳定性（低吸水性），良好的滑动性能和耐磨性，良好的切削加工性，良好的电绝缘性和介电性能。
物性表：| Physical Properties | Metric | English | Comments |
|---|---|---|---|
| Density | 1.43 g/cc | 0.0517 lb/in³ | ISO 1183-1 |
| Moisture Absorption at Equilibrium | 0.20 % | 0.20 % | 50% RH |
| Water Absorption at Saturation | 0.80 % | 0.80 % | |
| Outgassing - Total Mass Loss | 0.47 % | 0.47 % | |
| Mechanical Properties | Metric | English | Comments |
| Hardness, Rockwell M | 88 | 88 | ISO 2039-2 |
| Hardness, Shore D | 81 | 81 | |
| Ball Indentation Hardness | 160 MPa | 23200 psi | ISO 2039-1 |
| Tensile Strength | 78.0 MPa | 11300 psi | at Yield; ISO 527-1/-2 |
| Elongation at Break | 50 % | 50 % | ISO 527-1/-2 |
| Elongation at Yield | 40 % | 40 % | ISO 527-1/-2 |
| Tensile Modulus | 3.30 GPa | 479 ksi | ISO 527-1/-2 |
| Flexural Strength | 106 MPa | 15400 psi | |
| Flexural Modulus | 3.45 GPa | 500 ksi | |
| Compressive Strength | 29.0 MPa @Strain 1 % |
4210 psi @Strain 1 % |
ISO 604 |
| 49.0 MPa @Strain 2 % |
7110 psi @Strain 2 % |
ISO 604 | |
| 85.0 MPa @Strain 5 % |
12300 psi @Strain 5 % |
ISO 604 | |
| Charpy Impact Unnotched | NB | NB | ISO 179-1/1eU |
| Charpy Impact, Notched | 1.00 J/cm² | 4.76 ft-lb/in² | ISO 179-1/1eA |
| Coefficient of Friction, Dynamic | 0.30 - 0.45 | 0.30 - 0.45 | |
| Limiting Pressure Velocity | 0.100 MPa-m/sec | 2860 psi-ft/min | at 1 m/s unlubricated |
| 0.160 MPa-m/sec | 4570 psi-ft/min | at 0.1 m/s unlubricated | |
| Electrical Properties | Metric | English | Comments |
| Volume Resistivity | >= 1.0e+14 ohm-cm | >= 1.0e+14 ohm-cm | IEC 60093 |
| Surface Resistivity per Square | >= 1.0e+13 ohm | >= 1.0e+13 ohm | IEC 60093 |
| Dielectric Constant | 3.8 @Frequency >=100000 Hz |
3.8 @Frequency >=100000 Hz |
IEC 60250 |
| Dielectric Strength | 20.0 kV/mm | 508 kV/in | |
| Dissipation Factor | 0.0030 @Frequency 100000 Hz |
0.0030 @Frequency 100000 Hz |
IEC 60250 |
| Comparative Tracking Index | 600 V | 600 V | IEC 60112 |
| Thermal Properties | Metric | English | Comments |
| CTE, linear | 110 µm/m-°C @Temperature 23.0 - 100 °C |
61.1 µin/in-°F @Temperature 73.4 - 212 °F |
|
| Thermal Conductivity | 0.310 W/m-K | 2.15 BTU-in/hr-ft²-°F | |
| Melting Point | 180 °C | 356 °F | DSC, 10°C/min.; ISO 11357-1/-3 |
| Maximum Service Temperature, Air | 90.0 °C | 194 °F | Continuous; 20,000 h |
| 105 °C | 221 °F | Continuous; 5,000 h | |
| Deflection Temperature at 1.8 MPa (264 psi) | 110 °C | 230 °F | ISO 75-1/-2 |
| Flammability, UL94 | HB | HB | |
| Oxygen Index | 15 % | 15 % | ISO 4589-1/-2 |
| Compliance Properties | Metric | English | Comments |
| 3A-Dairy | No | No | |
| European Food 1935/2004 | No | No | |
| FDA | 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 | Limited | Limited | |
| Chlorinated Solvents | Limited | Limited | |
| 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 | |
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