Written by AZoMMay 4 2001
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Polymer Type |
| Thermoplastic |
Advantages |
| Foamed ABS gives increased rigidity compared to a part made from the same weight of solid material. Injection speeds are increased and locking pressures are lower, hence relatively inexpensive moulds can be used. Tend to have a reduced tendency to sinking. |
Disadvantages |
| Ram injection not recommended. Cooling time is longer than for other ABS varieties. Air locks can cause cell collapse therefore, adequate venting must be provided. Have lower modulus, notched izod impact and tensile strengths than other classes of ABS. |
Typical Properties |
| | | Density (g/cm3) | 0.85 | | Surface Hardness | RR60 | | Tensile Strength (MPa) | 25 | | Flexural Modulus (GPa) | 1.5 | | Notched Izod (kJ/m) | 0.07 | | Linear Expansion (/°C x 10-5) | 10 | | Elongation at Break (%) | 4 | | Strain at Yield (%) | 1.2 | | Max. Operating Temp. (°C) | 70 | | Water Absorption (%) | 0.6 | | Oxygen Index (%) | 19 | | Flammability UL94 | HB | | Volume Resistivity (log ohm.cm) | 16 | | Dielectric Strength (MV/m) | 10 | | Dissipation Factor 1kHz | 0.008 | | Dielectric Constant 1kHz | 2.6 | | HDT @ 0.45 MPa (°C) | 84 | | HDT @ 1.80 MPa (°C) | 82 | | Material. Drying hrs @ (°C) | 2 @ 80 | | Melting Temp. Range (°C) | 230 - 270 | | Mould Shrinkage (%) | 0.8 | | Mould Temp. Range (°C) | 40 - 60 | |
Applications |
| Furniture, Loudspeaker Boxes, Picture Frames and Knobs. Telephone junction boxes, sprinkler housings, television surrounds, electric fan components, business machine housings, computer readout terminals, copying machine housings and automotive bucket seats. |
| Source : Abstracted from Plascams For more information on Plascams please visit RAPRA Technology Ltd. |