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PC-135

PC-135

General Purpose Machinable Compound

 

DESCRIPTION:

Polycast 135 is a low viscosity, easily machined, general purpose casting/potting compound. It has good overall properties and will not support fungus growth.

 

PROPERTIES - UNCURED:
Part A
Part B (PC 90) 
Part B (PC 110B)
Color, Visual Black or Neutral Amber Dark Amber
Viscosity, cps. (ASTMD2393) 57,000 400  700
Specific Gravity 1.62 1.0  0.95
Mix Ratio (By Weight)   100:6-7 100:9-10
Mixed Viscosity, cps.   12,000  6,000 
Pot Life @ 72o F   30 min.  2.5 hours
Shelf Life @ 72o F, months 12   12  12
PROPERTIES - CURED:      
Hardness Durometer (Shore D) (ASTMD 2240)   88 89
Tensile Strength, psi (ASTMD 638)    7,000 7,000
Tensile Elongation, % (ASTMD 638)   2-3  2-3
Compressive Strength, psi (ASTMD 695)    14,500 15,000
Flexural Strength, psi (ASTMD 790)   13,000 13,000
Coefficient of Thermal Expansion   40 x 10-6  40 x 10-6
Shrinkage on Cure   0.002  0.002
Heat Distortion point (°C)   80 155
Service Temperature (°C)   -55 - 105 -55 - 155
Dielectric Strength, volts/mil (ASTMD 149)   450 450
Dielectric Constant, 60 Hz  (ASTMD 150)   4.4   4.4
Dissipation Factor, 60 Hz    (ASTMD 150)   0.02  0.02
Volume Resistivity, ohm-cm    1.0 x 1015
5.0 x 1014

USE INSTRUCTIONS:

 

1.        Premix material in the original container prior to use to insure any settled filler may be reincorporated.

2.        Weigh out the required amount of PC 135.

3.        Measure out the appropriate amount of material (Part A and Part B)

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  with PC 110B

                                Post Cure: 2 hours at 155°C