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Polycarbonate Plastic
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Polycarbonate plastic is a thermoplastic that has excellent
high-impact strength over a wide temperature range. Polycarbonate
can come in the form of general-purpose molding, extruded grade, or
several special grades such as flame retardant or blow molding
grades.
- Polycarbonate plastic is
characterized by excellent toughness, transparency, heat and
flame resistance, and dimensional stability.
- Exposure to very hot or cold
temperatures has very little effect on polycarbonate.
- Polycarbonate is unaffected by
greases, oils and acids.
- Polycarbonate's arc resistance is
lower than most other plastics.
- Some polycarbonate applications
include face plates, telephone finger wheels, meter covers,
computer disk packs, storage modules, power tool housing, grills
for fans and air conditioners, indoor/outdoor lighting
diffusers, exit signs, safety helmets, safety and prescription
eyeware, blood oxygenators, boat hatch covers, and door/window
hardware.
Specifications:
| |
TYPES OF POLYCARBONATE |
| Property |
General Purpose |
High Flex Modulus |
20% Glass Reinforced |
| PHYSICAL
PROPERTIES |
| Specific gravity |
1.2 |
1.25 |
1.35 |
| Specific volume (in^3/lb) |
23 |
22.2 |
20.5 |
| Water absorption, 24 h, (%) |
0.15 |
0.12 |
0.16 |
| MECHANICAL
PROPERTIES |
| Tensile strength (psi) |
9,000-10,500 |
8,000-9,600 |
16,000 |
| Elongation (%) |
110-125 |
10-20 |
4-6 |
| Tensile modulus (10^5 psi) |
3.4 |
4.5 |
8.6 |
| Flexural strength (psi) |
11,000-15,000 |
15,000 |
19,000 |
| Flexural modulus (10^5 psi) |
3.0-3.4 |
5.0 |
8.0 |
| Impact strength, Izod
(ft-lb/in of notch) |
12-16 |
2 |
2 |
| Fatigue endurance limit, 10^7
cycles (psi) |
1,000 |
2,000 |
5,000 |
| Hardness, Rockwell M |
62-70 |
85 |
91 |
| THERMAL
PROPERTIES |
| Thermal conductivity
(Btu-in/hr-ft^2-F) |
1.35 |
1.41 |
1.47 |
| Coefficient of thermal
expansion |
6.6-7.0 |
3.2 |
2.7 |
| Deflection temperature (F) |
|
|
At 264 psi |
260-270 |
288 |
295 |
|
At 66 psi |
280 |
295 |
300 |
| Flammability rating |
HB, V-0 |
V-2, V-0 |
V-2, V-0 |
|
ELECTRICAL PROPERTIES |
| Dielectric strength (V/mil) |
380-400 |
450 |
490 |
| Dielectric constant |
|
|
At 1 kHz |
3.02 |
- |
- |
| Dissipation factor |
|
|
At 1 kHz |
0.0021 |
- |
- |
| Volume resistivity (ohm-cm)
At 73 F 50% RH |
>10^16 |
>10^16 |
>10^16 |
| Arc resistance (s) |
10-120 |
5-120 |
5-120 |
| OPTICAL
PROPERTIES |
| Refractive index |
1.586 |
- |
- |
| Transmittance (%) |
85-89 |
- |
- |
| FRICTIONAL
PROPERTIES |
| Coefficient of friction |
|
|
Self |
0.52 |
- |
- |
|
Against steel |
0.39 |
- |
- |
*Information provided by IAPD
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