PC-135

General Purpose Machinable Compound

Details

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 @ 72^o F		30 min.	2.5 hours
Shelf Life @ 72^o F, months	12	12	12

Properties Cured	Part A	Part B (PC 90)	Part B (PC110B)
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

Premix material in the original container prior to use to insure any settled filler may be reincorporated.
Weigh out the required amount of PC 135.
Measure out the appropriate amount of material (Part A and Part B)
Mix thoroughly, scraping both sides and bottom of container.
Evacuate mixture at 29 in. Hg for 5- 10 minutes.
Pour into mold or cavity.