Share:
PC-287

PC-287

Very High Thermally Conductive Castable Epoxy

 

Polycast 287 is an epoxy casting system giving extremely high thermal conductivity.  Different hardeners can be used to cure PC 287 to prevent deterioration and retention of properties.

    Part A                                                  Part B

          

     

 

  
 

 

 

PROPERTIES - UNCURED: Part A Part B (PC 90) Part B (PC 67)  
Color, Visual Black  Amber   Brown  
Viscosity, cps. 250,000 400 500 ASTMD2393
Specific Gravity 2.80  1.0   1.0  
Mix Ratio (By Weight)   100:3-4 100:5-6  
Mixed Viscosity, cps.    150,000  150,000 ASTMD2393 
Pot Life @ 72o F, hours     1 4  
Shelf Life @ 72o F, months   12 12  

 

PROPERTIES - CURED:

       
Hardness Durometer (Shore D)   93 94 ASTMD 2240
Tensile Strength, psi   8000 8500 ASTMD 638
Tensile Elongation, %   1 1 ASTMD 638
Compressive Strength, psi    19,000 25,000 ASTMD 695
Flexural Strength, psi   11,500 13,000 ASTMD 790
Coefficient of Thermal Expansion (cm/cm/°C) 25 x 10-6 25 x 10-6  
Heat Distortion Point   150°C 180°C  
Dielectric Strength, volts/mil   400 400   ASTMD 149
Dielectric Constant, 60 Hz   6.1 6.3 ASTMD 150
Dissipation Factor, 60 Hz     0.02 0.02 ASTMD 150
Volume Resistivity, ohm-cm   1.4 x 1013 1 x 1015 ASTMD 257
Thermal Conductivity, BTU (in)/(hr)(ft2 )(°F) 30 30  

                                                         

MIXING INSTRUCTIONS:

1.       Premix P.C. 287 in the original container prior to use to insure any settled filler may be reincorporated. Warming PC 287 to 100°F facilitates ease of use.

2.       Weigh out the required amount of P.C.287 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.