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PC-266

PC-266

General Purpose Epoxy Casting Compound

Polycast 266 is an easy to use epoxy casting/potting compound exhibiting excellent adhesion to metals, ceramics and most plastics.  When properly cured with Polycure 67, Polycast 266 will conform to the requirements of MIL-I-16923, Types B, C & D, and will not support fungus growth.

    Part A                                                  Part B

          

     


  

 

 

PROPERTIES UNCURED (Visual) A&B:

Color Black/White/Grey    
Dk. Brown
 
Viscosity, cps. 80,000     
400
ASTMD2393
Specific Gravity 1.59    
1.0
 
Mix Ratio (By Weight) 100:14  
Mixed Viscosity, cps. 25,000-60,000 ASTMD2393
Pot Life @ 72o F, hours 5  
Shelf Life @ 72o F, months 12        
12
 


PROPERTIES - CURED:

Hardness Durometer (Shore D) 89 ASTMD 2240
Tensile Strength, psi 10,500 ASTMD 638
Tensile Elongation, % 2-4 ASTMD 638
Compressive Strength, psi 24,000 ASTMD 695
Flexural Strength, psi 24,000 ASTMD 790
Coefficient of Thermal Expansion 40 x 10-6  
Shrinkage on Cure 0.002  
Service Temperature (°C) -55 - 155  
Dielectric Strength, volts/mil 440 ASTMD 149
Dielectric Constant, 60 Hz 4.8 ASTMD 150
Dissipation Factor, 60 Hz 0.01 ASTMD 150
Volume Resistivity, ohm-cm 5.0 x 1016  
Thermal Conductivity, BTU's 4.7  

Use Instructions:

  1. Premix P.C. 266 in the original container prior to use to insure any settled filler may be reincorporated.
  2. Weigh out the required amount of P.C.266.
  3. Measure out the appropriate amount of material: 100 Parts (part A) : 14 parts (part B) by weight.
  4. Mix thoroughly, scraping both sides and bottom of container.
  5. Evacuate mixture at 29 in. Hg for 5- 10 minutes.
  6. Pour into mold or cavity.

Cure Schedule:

 

Room Temp. - 24 hrs.

 

2 hours at 100o C

 

1 hour at 125o