POLYCAST- 250
FLEXIBLE, LOW CTE, SHOCK RESISTANT EPOXY COMPOUND
DESCRIPTION
PC 250 is a flexible, non-abrasive filled 100% solids epoxy system. It is a resin which exhibits low coefficient of thermal expansion and exceptional shock resistance. PC 250 is designed in such a way that the mix ratio is 1:1 by volume. It is a room temperature cure, has excellent moisture resistance, and is also machine dispensable.
| PROPERTIES - UNCURED: |
Part A |
Part B |
| Color , visual ......... |
Clear |
Black or White |
| Viscosity, ASTM-D-2393 (c.p.s. @ 25o C).. |
600 |
2500 |
| Specific Gravity ............. |
1:12 |
1:29 |
| Mix Ratio (volume) |
1:1
|
| Mixed Viscosity, ASTM-D-2393 (@ 25o C) |
900-1500
|
| Pot Life @ 25OC (100 grams) ..... |
15-20 minutes
|
| Shelf Life @ 70o F .......... |
12 months
|
PROPERTIES - CURED
| Hardness, ASTM-D-2240(Durometer)....... |
Shore A 70 |
| Tensile Strength, ASTM-D-638 ....... |
3,500 psi |
| Tensile Elongation, ASTM-D-638 ...... |
25% |
| Coefficient of Thermal Expansion ...... |
7 x 10-6 |
| Water Absorption............. |
0.1% |
| Dielectric Strength, ASTM-D-149 (volts/mil) ... |
370 |
| Dielectric Constant, ASTM-D-150 ........ |
4.5 |
| Dissipation Factor, ASTM-D-150........ |
0.08 |
| Volume Resistivity, ASTM-D-257 (ohm-cm)..... |
7 x 1012 |
| Thermal Conductivity, (BTU*in)/(hr*ft2*ºF)... |
3.5 |
| Temperature Class............... |
B |
MIXING INSTRUCTIONS
Pre-mix Part A and Part B separately. Then measure 1:1 by volume (A to B).Mix thoroughly scraping the sides and bottom of the container. Evacuate and then pour into mold or cavity.
CURE SCHEDULE
Room temperature cure @75°F with full properties after 24 hours.
Demold time @ 75°F - 4 hours
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