POLYCAST-240
SUPERIOR THERMAL SHOCK RESISTANT EPOXY COMPOUND
DESCRIPTION
PC 240 is a flexible unfilled epoxy resin system that exhibits low coefficient of thermal expansion and excellent shock resistance. PC 240 is suitable for use in automated dispensing equipment
PROPERTIES - UNCURED (Part A) Part B
| Color , visual ......... |
Clear |
Clear |
| Viscosity, ASTM-D-2393 (c.p.s. @ 25o C).. |
300 |
500 |
| Specific Gravity ............. |
1:02 |
1:14 |
| Mix Ratio (by wt.) |
100:15
|
| Mixed Viscosity, ASTM-D-2393 (@ 25o C) |
500
|
| Pot Life @ 25OC (100 grams) ..... |
40 minutes
|
| Shelf Life @ 70o F .......... |
12 months
|
PROPERTIES - CURED
| Hardness, ASTM-D-2240 (Durometer)....... |
Shore A 40 ±5 |
| Tensile Strength, ASTM-D-638 ....... |
3,000 psi |
| Tensile Elongation, ASTM-D-638 ...... |
75-100 % |
| Coefficient of Thermal Expansion ...... |
7 x 10-6 |
| Temperature Class .............. |
B |
| Moisture Absorption............ |
0.07% |
| Dielectric Strength, ASTM-D-149 (volts/mil) ... |
450 |
| 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's........ |
3.5 |
| Thermal Cycling -75ºC to 80ºC ....... |
Passes |
MIXING INSTRUCTIONS
Pre-mix Part A and Part B separately. Then measure 100:15 parts 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 for 24 hours.
Post cure @ 250ºF for 2 hours.
