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PC-280

PC-280

High Thermal Conductivity Epoxy Casting Compound


Polycast 280 is a low viscosity, highly filled, epoxy formulation which, in addition to having excellent electrical properties, has high thermal conductivity and low thermal expansion. PC-280 is available in a thixotropic version for dipping applications.

    Part A                                                  Part B

          

     


  

 

 

Properties Uncured (A-C)

   

Color

Black
Amber
Brown

Viscosity, cps.

100,000
400
500

ASTMD2393
Specific Gravity 2.30
1.0
1.0
Mix Ratio (By Weight) 100:5-6
100:7-8
Mixed Viscosity, cps. 75,000
75,000
ASTMD2393
Pot Life @ 72o F, hours 1
4
Shelf Life @ 72o F, months 12
12

 Properties Cured

             

Hardness Durometer (Shore D) 91
92
ASTMD 2240
Tensile Strength, psi 8000
8500
ASTMD 638
Tensile Elongation, % 1
1
ASTMD 638
Compressive Strength, psi 16,500
19,000
ASTMD 695
Flexural Strength, psi 11,500
13,000
ASTMD 790
Coefficient of Thermal Expansion (cm/cm/°C) 40 x 10-6
24 x 10-6
 
Heat Distortion Point 150°C
150°C
Dielectric Strength, volts/mil
450
475
Dielectric Constant, 60 Hz 6.2
6.4
ASTMD 150
Dissipation Factor, 60 Hz 0.02
0.02
ASTMD 150
Volume Resistivity, ohm-cm 1.3 x 1015
 5 x 1015
ASTMD 257
Thermal Conductivity, BTU (in)/(hr)(ft2 )(°F) 10
10

              

MIXING INSTRUCTIONS:

1.       Premix P.C. 280 in the original container prior to use to insure any settled filler may be reincorporated. Warming PC 280 to 100°F facilitates ease of use.

2.       Weigh out the required amount of P.C.280 Part A and the requisite Part B.

3.       Mix thoroughly, scraping both sides and bottom of container.

4.       Evacuate mixture at 29 in. Hg for 5-10 minutes (if desired).

5.       Pour into mold or cavity.

 

CURE SCHEDULE:                                                 

PC-90 - Room Temp. - 24 hrs. or 2 hours at 150°F.

PC-67 - Overnight at 125°F; or 2 hours at 200o F; or 1 hour at 250oF

NOTE: For service temperature above 300°F, post cure 2-3 hours at 325-350°F.