类别：聚合物；热塑性；聚甲醛（POM）
材料说明：®缩醛共聚物等级M25是一种高分子量，韧性高，耐冲击级主要用于挤出和注塑成型的应用选择。
建议与长度至少20:1的直径比标准挤出机。螺钉应高至少3:1和4:1的压缩比是保证熔化和均匀的熔体均匀度。
物性表：| Physical Properties | Metric | English | Comments | ||
|---|---|---|---|---|---|
| Specific Gravity | 1.41 g/cc | 1.41 g/cc | ASTM D792 | ||
| Density | 1.41 g/cc | 0.0509 lb/in³ | ISO 1183 | ||
| Density of Compound | 1.20 g/cc | 0.0434 lb/in³ | melt; Internal | ||
| Water Absorption | 0.75 % | 0.75 % | ISO 62 | ||
| Moisture Absorption | 0.200 % | 0.200 % | 23°C/50%RH; ISO 62 | ||
| Linear Mold Shrinkage, Flow | 0.022 cm/cm | 0.022 in/in | ASTM D955 | ||
| 0.022 cm/cm | 0.022 in/in | ISO 294-4 | |||
| Linear Mold Shrinkage, Transverse | 0.018 cm/cm | 0.018 in/in | ASTM D955 | ||
| 0.018 cm/cm | 0.018 in/in | ISO 294-4 | |||
| Melt Flow | 2.5 g/10 min | 2.5 g/10 min | ASTM D1238 | ||
| 2.2 g/10 min @Load 2.16 kg, Temperature 190 °C |
2.2 g/10 min @Load 4.76 lb, Temperature 374 °F |
(MVR) cm³/10min; ISO 1133 | |||
| Mechanical Properties | Metric | English | Comments | ||
| Tensile Strength, Yield | 60.7 MPa | 8800 psi | ASTM D638 | ||
| 63.0 MPa | 9140 psi | 50mm/min; ISO 527-2/1A | |||
| 34.5 MPa @Temperature 71.1 °C |
5000 psi @Temperature 160 °F |
ASTM D638 | |||
| 94.5 MPa @Temperature -40.0 °C |
13700 psi @Temperature -40.0 °F |
ASTM D638 | |||
| Elongation at Yield | 12 % | 12 % | 50mm/min; ISO 527-2/1A | ||
| Tensile Modulus | 2.46 GPa | 357 ksi | 1mm/min; ISO 527-2/1A | ||
| Flexural Modulus | 2.43 GPa | 352 ksi | ISO 178 | ||
| 0.689 GPa @Temperature 104 °C |
100 ksi @Temperature 220 °F |
ASTM D790 | |||
| 1.24 GPa @Temperature 71.1 °C |
180 ksi @Temperature 160 °F |
ASTM D790 | |||
| 2.59 GPa @Temperature 22.8 °C |
375 ksi @Temperature 73.0 °F |
ASTM D790 | |||
| Izod Impact, Notched | 0.801 J/cm | 1.50 ft-lb/in | ASTM D256 | ||
| 0.641 J/cm @Temperature -40.0 °C |
1.20 ft-lb/in @Temperature -40.0 °F |
ASTM D256 | |||
| Izod Impact, Notched (ISO) | 8.30 kJ/m² | 3.95 ft-lb/in² | ISO 180/1A | ||
| Charpy Impact Unnotched | 25.0 J/cm² | 119 ft-lb/in² | partial; ISO 179/1eU | ||
| 19.0 J/cm² @Temperature -30.0 °C |
90.4 ft-lb/in² @Temperature -22.0 °F |
ISO 179/1eU | |||
| Charpy Impact, Notched | 0.910 J/cm² | 4.33 ft-lb/in² | ISO 179/1eA | ||
| Tensile Creep Modulus, 1 hour | 2100 MPa | 305000 psi | ISO 899-1 | ||
| Tensile Creep Modulus, 1000 hours | 1100 MPa | 160000 psi | ISO 899-1 | ||
| Electrical Properties | Metric | English | Comments | ||
| Volume Resistivity | 1.00e+14 ohm-cm | 1.00e+14 ohm-cm | ASTM D257 | ||
| Thermal Properties | Metric | English | Comments | ||
| CTE, linear | 120 µm/m-°C | 66.7 µin/in-°F | ISO 11359-2 | ||
| CTE, linear, Transverse to Flow | 120 µm/m-°C | 66.7 µin/in-°F | ISO 11359-2 | ||
| Specific Heat Capacity | 2.21 J/g-°C | 0.528 BTU/lb-°F | Internal | ||
| Thermal Conductivity | 0.155 W/m-K | 1.08 BTU-in/hr-ft²-°F | Internal | ||
| Melting Point | 165 °C | 329 °F | ASTM D3418 | ||
| 166 °C | 331 °F | 10°C/min; ISO 11357-1,-2,-3 | |||
| Deflection Temperature at 1.8 MPa (264 psi) | 94.0 °C | 201 °F | ISO 75-1, -2 | ||
| 110 °C | 230 °F | ASTM D648 | |||
| Processing Properties | Metric | English | Comments | ||
| Processing Temperature | 80.0 - 120 °C | 176 - 248 °F | Cavity temperature | ||
| 165 °C | 329 °F | Ejection temperature; Internal | |||
| Zone 1 | 170 - 180 °C | 338 - 356 °F | |||
| Zone 2 | 180 - 190 °C | 356 - 374 °F | |||
| Zone 3 | 180 - 190 °C | 356 - 374 °F | |||
| Zone 4 | 190 - 200 °C | 374 - 392 °F | |||
| Die Temperature | 190 - 200 °C | 374 - 392 °F | |||
| Melt Temperature | 160 - 220 °C | 320 - 428 °F | |||
| Mold Temperature | 82.2 - 93.3 °C | 180 - 200 °F | generally preferred range, may vary with thickness | ||
| Drying Temperature | 80.0 - 100 °C | 176 - 212 °F | |||
| Dry Time | 3.00 hour | 3.00 hour | |||
| Injection Pressure | 60.0 - 120 MPa | 8700 - 17400 psi | |||
| Hold Pressure | 60.0 - 120 MPa | 8700 - 17400 psi | |||
| Back Pressure | 0.500 MPa | 72.5 psi | |||
| Hot-Working Temperature | 180 - 200 °C | 356 - 392 °F | |||
| De |
|||||
| Injection molding | Yes | ||||
| Injection speed | slow | ||||
| Pellets | Yes | ||||
| Pre-drying | Drying is not normally required with proper storage | ||||
| Processing conditions | ISO 9988-2 | ||||
| Profile extrusion | Yes | ||||
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