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Polystyrene Plastic
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Polystyrene plastic
is a
tough, light weight plastic with good dielectric properties.
Polystyrene is available in a wide range of formulations that alter
it's properties, making it an ideal plastic for many applications.
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Some types of polystyrene plastic include general purpose, high
impact, structural form, and extruded.
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Some applications of polystyrene include knobs, light shields,
disposable beverage glasses, packaging items, radio/TV cabinets,
tape reels, toys, houseware, and baseboards.
Specifications:
| |
Polymers |
Copolymers |
| Properties |
General
Purpose |
Impact
Modified |
Crystal
Clear |
Impact
Modified |
Glass
Reinforced |
| PHYSICAL
PROPERTIES |
| Specific gravity |
1.04-10.9 |
1.03-1.10 |
1.08-1.10 |
1.05-10.8 |
1.13-1.22 |
| Specific volume (in^3/lb) |
26.0-25.6 |
28.1-25.2 |
- |
- |
- |
| Water absorption, 24 h, (%) |
0.03-0.10 |
0.05-0.60 |
0.1 |
0.1 |
0.08 |
| MECHANICAL
PROPERTIES |
| Tensile strength (psi) |
5,000-12,000 |
1,500-7,000 |
7,000-7,600 |
4,800-7,200 |
10,500-12,500 |
| Elongation (%) |
0.5-2.0 |
2-60 |
1.4-1.7 |
2.0-20 |
1.3-2.0 |
| Tensile modulus (10^5 psi) |
4.0-6.0 |
1.4-5.0 |
4.4-4.7 |
2.8-4.2 |
6.3-10.0 |
| Flexural strength (psi) |
8,000-17,000 |
3,000-12,000 |
12,000-12,600 |
8,500-12,200 |
12,200-19,700 |
| Flexural modulus (10^5 psi) |
4.0-4.7 |
1.5-4.6 |
4.6-4.9 |
3.2-4.5 |
5.5-9.8 |
| Impact strength, Izod
(ft-lb/in of notch) |
0.2-0.45 |
0.5-4.0 |
0.3-0.5 |
0.5-4.4 |
1.8-2.6 |
| Hardness, Rockwell M |
65-80 |
10-90 |
108 |
80 |
101 |
| THERMAL
PROPERTIES |
| Thermal conductivity
(Btu-in/hr-ft^2-F) |
2.4-3.3 |
1.0-3.0 |
2.4-3.3 |
1.0-3.0 |
- |
| Coefficient of thermal
expansion |
3.3-4.4 |
1.9 |
3.5-3.7 |
3.5-3.7 |
2.0-2.2 |
| Deflection temperature (F) |
|
|
At 264 psi |
190-220 |
160-200 |
235-249 |
235-249 |
235-260 |
|
At 66 psi |
180-230 |
180-220 |
- |
- |
- |
| Flammability rating |
HB |
HB |
HB |
HB |
HB |
| ELECTRICAL
PROPERTIES |
| Dielectric strength (V/mil) |
500-700 |
300-600 |
500-700 |
300-600 |
- |
| Dielectric constant |
|
|
At 1 kHz |
2.40-2.65 |
2.4-4.5 |
- |
- |
- |
| Dissipation factor |
|
|
At 1 kHz |
0.0001-0.0003 |
0.0004-0.0020 |
- |
- |
- |
| Volume resistivity (ohm-cm)
At 73 F 50% RH |
10^17-10^19 |
10^16 |
- |
- |
- |
| Arc resistance (s) |
60-135 |
20-100 |
95 |
95 |
- |
| OPTICAL
PROPERTIES |
| Refractive index |
1.60 |
- |
1.59 |
- |
- |
| Transmittance (%) |
87-92 |
35-57 |
92 |
- |
- |
*Information provided by IAPD
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