|
Properties |
Method (ASTM) |
Value |
|
Specific gravity |
D-792-64-T |
1.19 |
|
Water absorption |
D-570-63 |
0.3% |
|
Burning rate |
D-635-63 |
30 mm/min |
| (flammability) |
|
|
|
Residual monomer |
|
20% Max: (Wt) |
| Optical |
|
|
|
Light transmittance, |
|
|
|
Total |
D-1003-61 |
93% |
|
Refractive Index, Nd |
D-542-50 |
1.49 |
|
Critical angle |
|
|
|
(/\=5893A) |
|
42`15` |
| Mechanical |
|
|
|
Tensile strength |
|
|
|
at rupture |
D-638-64 T |
760kg/cm |
|
Elongation at rupture |
D-638-64 T |
4.5% |
|
Modulous of elasticity |
D-638-64 T |
28.000kg/cm |
|
Compressive strength |
|
|
|
at yield |
D-695-63 T |
1,260kg/cm |
|
Impact strength |
|
|
|
charpy unnothched |
|
0.48kg-m |
|
Izod milled |
|
0.4 ft-lbs per in. Of notch |
| notched |
D-256-56 |
|
|
Rockwell Hardness |
D-785-62 |
M100 |
| Thermal |
|
|
|
Coefficient of thermal |
|
|
|
expansion (-30 to 30°c) |
D-686-44 |
6x10`cm/cm/°c |
| Thermal |
|
5x10° Cal/Sec/Cm/°C/cm |
| conductivity |
C-177 |
|
|
specific heat (-20 to 80°C) |
|
0.35 Cal/gm °C |
|
Heat forming temperature |
|
140-180 °C |
|
Heat distortion temperature |
|
|
|
2°C/Min.At 264 p.s.i |
D-648-56 |
100°C |
|
Maximum recommended |
|
|
|
continuous service temperature |
|
85°C |
| Electrical |
|
|
|
Volume resistivity |
D-257-61 |
>10 15 ohm-cm |
|
Dielectric strength |
D-149-64 |
20 KV/mm |
 
Storage & Handling
Sheets must not be placed in contact with heating coils,
radiators, hot water, steam pipes or any other source of heat, Unpacked sheets
should be kept on edge in angled frames. Horizontal storing of sheets should be done carefully, covering each
sheet with a piece of cloth to avoid scratches, without over
hanging.
SPI sheets are masked by bleached craft
paper on both sides to avoid scratching, during storage & handling. If the
surface is scratched, proper polishing agent must be used while buffing &
hand polishing. It is recommended that 1% of soap solution should be used for
sheet cleaning.
|