Epoxy Casting Compound
Room Temperature Cure
DESCRIPTION:
Polycast 290 FC is a 100% solids epoxy system. It is a fast cure, filled, low cost, general purpose encapsulant. PC 290 FC is designed for room temperature cure, and has excellent moisture resistance. It is machine dispensible.
| PROPERTIES - UNCURED |
(Part A) |
Part B |
| Color , visual ......... |
Orange |
Clear |
| Viscosity, ASTM-D-2393 (c.p.s. @ 25o C).. |
7-10,000 |
5-7,000 |
| Specific Gravity ............. |
3.63 |
0.96 |
| Mixed Specific Gravity......... |
|
2.77
|
|
| Mix Ratio (weight).......... |
|
100:2.9
|
|
| Mixed Viscosity, ASTM-D-2393 (@ 25o C) |
|
5-8000
|
|
| Pot Life @ 25OC (100 grams) ..... |
|
25 Minutes
|
|
PROPERTIES - CURED
| Hardness, ASTM-D-2240 (Durometer)........ |
Shore D 82 |
| Tensile Strength, ASTM-D-638 ....... |
8,500 psi |
| Tensile Elongation, ASTM-D-638 ...... |
2 % |
| Flexural Strength, ASTM-D-790......... |
9,500 psi |
| Coefficient of Thermal Expansion ...... |
20 x 10-5 |
| Heat Distortion Point............. |
80°C |
| Water Absorption............. |
0.08% |
| Dielectric Strength, ASTM-D-149 (volts/mil) ... |
419 |
| Dielectric Constant, ASTM-D-150 ........ |
3.5 |
| Dissipation Factor, ASTM-D-150........ |
0.035 |
| Volume Resistivity, ASTM-D-257 (ohm-cm)..... |
1 x 1014 |
| Thermal Conductivity, BTU's........ |
2 |
MIXING INSTRUCTIONS
Pre-mix Part A and Part B separately. Then measure 100:2.9 by weight (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.
To accelerate cure, allow 2 hours @ room temperature, then 2 hours @ 125°F.
