POM俗名聚甲醛，是一种用途非常广泛的材料，外观呈半透明或者不透明的颗粒状，与象牙有点相似。
聚甲醛在较大的温度范围内具有较高的弹性模数、硬度、刚性和机械性能，可在104℃以下长期使用，脆化温度-40℃，吸水性极小。有“塑料中的金属”之称。
可代替大部分有色金属、汽车、机床、仪表内件、轴承、紧固件、齿轮、弹簧片、管道、运输带配件、电水煲、泵壳、沥水器、水龙头等
| Physical Properties | Metric | English | Comments |
|---|---|---|---|
| Specific Gravity | 1.75 g/cc | 1.75 g/cc | ASTM D 792 |
| Density | 1.75 g/cc | 0.0632 lb/in³ | ASTM D 792 |
| Moisture Absorption at Equilibrium | 0.26 % | 0.26 % | 23°C / 50% RH; ISO 62 |
| 0.16 % @Time 86400 sec |
0.16 % @Time 24.0 hour |
50% RH; ASTM D 570 | |
| Linear Mold Shrinkage, Flow | 0.0070 - 0.010 cm/cm @Time 86400 sec |
0.0070 - 0.010 in/in @Time 24.0 hour |
ASTM D 955 |
| Linear Mold Shrinkage, Transverse | 0.010 - 0.030 cm/cm @Time 86400 sec |
0.010 - 0.030 in/in @Time 24.0 hour |
ASTM D 955 |
| Mechanical Properties | Metric | English | Comments |
| Tensile Strength at Break | 84.0 MPa | 12200 psi | 5 mm/min; ISO 527 |
| 88.0 MPa | 12800 psi | Type I, 5 mm/min; ASTM D 638 | |
| Tensile Strength, Yield | 84.0 MPa | 12200 psi | 5 mm/min; ISO 527 |
| 88.0 MPa | 12800 psi | Type I, 5 mm/min; ASTM D 638 | |
| Elongation at Break | 1.3 % | 1.3 % | Type I, 5 mm/min; ASTM D 638 |
| 1.3 % | 1.3 % | 5 mm/min; ISO 527 | |
| Elongation at Yield | 1.3 % | 1.3 % | Type I, 5 mm/min; ASTM D 638 |
| 1.3 % | 1.3 % | 5 mm/min; ISO 527 | |
| Tensile Modulus | 10.61 GPa | 1539 ksi | 1 mm/min; ISO 527 |
| 10.82 GPa | 1569 ksi | 50 mm/min; ASTM D 638 | |
| Flexural Strength | 107 MPa | 15500 psi | 1.3 mm/min, 50 mm span; ASTM D 790 |
| 130 MPa | 18900 psi | ISO 178 | |
| Flexural Modulus | 9.28 GPa | 1350 ksi | 1.3 mm/min, 50 mm span; ASTM D 790 |
| 9.93 GPa | 1440 ksi | 2 mm/min; ISO 178 | |
| Izod Impact, Notched | 0.500 J/cm @Temperature 23.0 °C |
0.937 ft-lb/in @Temperature 73.4 °F |
ASTM D 256 |
| Izod Impact, Unnotched | 3.26 J/cm @Temperature 23.0 °C |
6.11 ft-lb/in @Temperature 73.4 °F |
ASTM D 4812 |
| Izod Impact, Notched (ISO) | 5.00 kJ/m² @Temperature 23.0 °C |
2.38 ft-lb/in² @Temperature 73.4 °F |
80*10*4; ISO 180/1A |
| Izod Impact, Unnotched (ISO) | 25.0 kJ/m² @Temperature 23.0 °C |
11.9 ft-lb/in² @Temperature 73.4 °F |
80*10*4; ISO 180/1U |
| Impact Test | 2.00 J | 1.48 ft-lb | Multiaxial Impact; ISO 6603 |
 |
10.0 J @Temperature 23.0 °C |
7.38 ft-lb @Temperature 73.4 °F |
Instrumented Impact Total Energy; ASTM D 3763 |
| Coefficient of Friction, Dynamic | 0.40 | 0.40 | ASTM D 3702 Modified |
| Coefficient of Friction, Static | 0.46 | 0.46 | ASTM D 3702 Modified |
| K (wear) Factor | 473 x 10-8 mm³/N-M | 235 x 10-10 in³-min/ft-lb-hr | Washer; ASTM D 3702 Modified |
| Thermal Properties | Metric | English | Comments |
| CTE, linear, Parallel to Flow | 95.0 µm/m-°C @Temperature -30.0 - 30.0 °C |
52.8 µin/in-°F @Temperature -22.0 - 86.0 °F |
ASTM D 696 |
| CTE, linear, Transverse to Flow | 65.0 µm/m-°C @Temperature -30.0 - 30.0 °C |
36.1 µin/in-°F @Temperature -22.0 - 86.0 °F |
ASTM D 696 |
| Deflection Temperature at 0.46 MPa (66 psi) | 163 °C | 325 °F | Flatw 80*10*4 sp=64mm; ISO 75/Bf |
| 183 °C @Thickness 3.20 mm |
361 °F @Thickness 0.126 in |
unannealed; ASTM D 648 | |
| Deflection Temperature at 1.8 MPa (264 psi) | 161 °C | 322 °F | Flatw 80*10*4 sp=64mm; ISO 75/Af |
| 161 °C @Thickness 3.20 mm |
322 °F @Thickness 0.126 in |
unannealed; ASTM D 648 | |
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