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
物性表：
图：| Physical Properties | Metric | English | Comments |
|---|---|---|---|
| Density | 1.52 g/cc | 0.0549 lb/in³ | ASTM D 792 |
| 1.52 g/cc | 0.0549 lb/in³ | ISO 1183 | |
| Moisture Absorption at Equilibrium | 0.20 % @Time 86400 sec |
0.20 % @Time 24.0 hour |
50% RH; ASTM D 570 |
| Linear Mold Shrinkage, Flow | 0.011 - 0.013 cm/cm @Time 86400 sec |
0.011 - 0.013 in/in @Time 24.0 hour |
ASTM D 955 |
| 0.012 cm/cm @Time 86400 sec |
0.012 in/in @Time 24.0 hour |
ISO 294 | |
| Linear Mold Shrinkage, Transverse | 0.019 - 0.021 cm/cm @Time 86400 sec |
0.019 - 0.021 in/in @Time 24.0 hour |
ASTM D 955 |
| 0.020 cm/cm @Time 86400 sec |
0.020 in/in @Time 24.0 hour |
ISO 294 | |
| Mechanical Properties | Metric | English | Comments |
| Tensile Strength at Break | 79.0 MPa | 11500 psi | ISO 527 |
| 80.0 MPa | 11600 psi | ASTM D 638 | |
| Tensile Strength, Yield | 80.0 MPa | 11600 psi | ASTM D 638 |
| 80.0 MPa | 11600 psi | ISO 527 | |
| Elongation at Break | 1.9 % | 1.9 % | ISO 527 |
| 2.1 % | 2.1 % | ASTM D 638 | |
| Elongation at Yield | 1.9 % | 1.9 % | ISO 527 |
| 2.1 % | 2.1 % | ASTM D 638 | |
| Tensile Modulus | 7.14 GPa | 1040 ksi | 1 mm/min; ISO 527 |
| 7.58 GPa | 1100 ksi | 50 mm/min; ASTM D 638 | |
| Flexural Strength | 115 MPa | 16700 psi | ISO 178 |
| 117 MPa | 17000 psi | ASTM D 790 | |
| Flexural Modulus | 6.00 GPa | 870 ksi | ISO 178 |
| 6.20 GPa | 899 ksi | ASTM D 790 | |
| Izod Impact, Notched | 0.530 J/cm @Temperature 23.0 °C |
0.993 ft-lb/in @Temperature 73.4 °F |
ASTM D 256 |
| Izod Impact, Unnotched | 4.48 J/cm @Temperature 23.0 °C |
8.39 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) | 27.0 kJ/m² @Temperature 23.0 °C |
12.8 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 |
| 9.00 J @Temperature 23.0 °C |
6.64 ft-lb @Temperature 73.4 °F |
Instrumented Impact Energy @ peak; ASTM D 3763 | |
| Thermal Properties | Metric | English | Comments |
| CTE, linear, Parallel to Flow | 10.8 µm/m-°C @Temperature -40.0 - 40.0 °C |
6.00 µin/in-°F @Temperature -40.0 - 104 °F |
ASTM E 831 |
| 113 µm/m-°C @Temperature -40.0 - 40.0 °C |
62.8 µin/in-°F @Temperature -40.0 - 104 °F |
ISO 11359-2 | |
| CTE, linear, Transverse to Flow | 3.60 µm/m-°C @Temperature -40.0 - 40.0 °C |
2.00 µin/in-°F @Temperature -40.0 - 104 °F |
ASTM E 831 |
| 44.3 µm/m-°C @Temperature -40.0 - 40.0 °C |
24.6 µin/in-°F @Temperature -40.0 - 104 °F |
ISO 11359-2 | |
| Deflection Temperature at 0.46 MPa (66 psi) | 165 °C | 329 °F | Flatw 80*10*4 sp=64mm; ISO 75/Bf |
| 162 °C @Thickness 3.20 mm |
324 °F @Thickness 0.126 in |
unannealed; ASTM D 648 | |
| Deflection Temperature at 1.8 MPa (264 psi) | 157 °C | 315 °F | Flatw 80*10*4 sp=64mm; ISO 75/Af |
| 160 °C @Thickness 3.20 mm |
320 °F @Thickness 0.126 in |
unannealed; ASTM D 648 |
|
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