物理性能:聚甲基丙烯酸甲酯 (Polymethylmethacrylate,简称PMMA,英文Acrylic),又称做压克力或有机玻璃,在香港多称做阿加力胶,它的铸板聚合物的数均分子量一般为2.2×104,相对密度为1.19~1.20,折射率为1.482~1.521,吸湿度在0.5%以下,玻璃化温度为105℃。具有高透明度,低价格,易于机械加工等优点,是平常经常使用的玻璃替代材料。
PMMA的颗粒样图:
PMMA的物性表:
Physical Properties | Metric | English | Comments |
---|---|---|---|
Density | 1.16 g/cc | 0.0419 lb/in³ | ISO 1183 |
Water Absorption | 0.30 % | 0.30 % | ISO 62 |
Linear Mold Shrinkage | 0.0040 - 0.0080 cm/cm | 0.0040 - 0.0080 in/in | |
Melt Flow | 5.9 g/10 min | 5.9 g/10 min | ISO 1133 |
Mechanical Properties | Metric | English | Comments |
Hardness, Rockwell M | 45 | 45 | ISO 2039-2 |
Tensile Strength | 52.0 MPa | 7540 psi | ISO 527 |
Elongation at Break | 20 % | 20 % | ISO 527 |
Flexural Modulus | 2.20 GPa | 319 ksi | ISO 178 |
Izod Impact, Notched (ISO) | 3.20 kJ/m² | 1.52 ft-lb/in² | ISO 180/1A |
Charpy Impact, Notched | 0.320 J/cm² | 1.52 ft-lb/in² | ISO 179/1eA |
3.60 J/cm² | 17.1 ft-lb/in² | ISO 179/1eU | |
Thermal Properties | Metric | English | Comments |
CTE, linear | 103 µm/m-°C | 57.2 µin/in-°F | ASTM E831 |
Vicat Softening Point | 89.0 °C | 192 °F | ISO 306B |
96.0 °C | 205 °F | ISO 306A | |
Heat Distortion Temperature | 83.0 °C | 181 °F | ISO 75A |
Flammability, UL94 | HB | HB | |
Glow Wire Test | 650 °C | 1200 °F | IEC 695-2-1 |
Optical Properties | Metric | English | Comments |
Refractive Index | 1.49 | 1.49 | ISO 489 |
Haze | 2.5 % | 2.5 % | ASTM D1003 |
Transmission, Visible | 90 % | 90 % | ASTM D1003 |
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