RBC-3428 Technical Data Sheet

Type:

Electronics

RBC-3428 is a filled, low viscosity, semi-flexible epoxy potting resin (epoxy potting compound) and epoxy encapsulating resin, which can be used for any size casting when used with the appropriate epoxy hardener. RBC-3428 epoxy resin, when mixed with AB-312 epoxy hardener yields castings with excellent high temperature properties. Also, because these are 100% solids, VOC compliant systems there is very little shrinkage.

HANDLING PROPERTIES:
Mixed Viscosity @ 25^oC, cps Shelf Life, (closed Container @ 25^oC)	900 12 months
PHYSICAL PROPERTIES (CURED):
Color Specific Gravity @ 25^oC Hardness, Shore D Linear Shrinkage, in./in. Moisture Absorption 10 Days @ 25^oC, % Izod Impact Strength, ft. lbs./in. of notch Tensile Strength @ 25^oC, psi Compressive Strength @ 25^oC, psi	Grey 1.40 75 0.003 0.20 0.40 9,200 14,200
THERMAL PROPERTIES (CURED):
Thermal Conductivity, cal/sec/cm2/^oC/cm X 10^-4 Thermal Stability, 1000 Hrs. @ 175^oC, % Wt. Loss Coefficient of Thermal Expansion, in./in./^oC X 10^-6 Heat Distortion Temperature, ^oC Operating Temperature Range, ^oC	8.0 0.50 39 55 -55 to 130
ELECTRICAL PROPERTIES (CURED):
Volume Resistivity @ 25^oC, ohm-cm Dielectric Strength, volts/mil Dielectric Constant @ 25^oC, 100 KC Dissipation Factor @ 25^oC, 100 KC	8x10¹⁶ 475 4.1 0.021

(Note: The above properties are typical of a system cured with hardener #B-31.)

RECOMMENDED HARDENERS:

AB-85: A fast set room temperature cure hardener used to make small castings. Can use heat for very fast cures.

AB-98: A medium set room temperature cure hardener with a good working time (90 minutes). Can be used to make small to medium size castings. Can also use heat for faster cures.

AB-312: A medium set room temperature or heat cure system that can withstand high temperatures (300^oF). Can also use heat for faster cures.

B-31: A slow set heat cure system with a long working time (3 hours) offering excellent air release for pieces with undercuts.

MIXING INSTRUCTIONS:
Weigh the desired amount of #3425 epoxy resin into a clean container and combine with recommended epoxy hardener in one of the ratios shown below.


Hardener	Parts by wt.	Pot Life
	per 100 pts. resin	100 grms. @ 25^oC
AB-85	25	10-15 min.
AB-98	25	90 min.
AB-312	17	2 hrs.
B-31	25	3 hrs.


RECOMMENDED CURE SCHEDULE:
Hardener	Cure @ 25^oC	Cure @ 65^oC	Cure @ 100^oC
AB-85	12 HRS.	30 MINS.	-
AB-98	24 HRS.	1 HR.	30 MINS.
AB-312	24-36 HRS.	1 1/2 HRS.	1 HR.
*B-31	-	2 HRS.	1 HR.

(*Can be cured at room temperature in large masses.)

ASSOCIATED PUBLICATIONS:

RBC-3428 Epoxy Resin Material Safety Data Sheet (MSDS)
AB-85 Epoxy Hardener Material Safety Data Sheet (MSDS)

AB-98 Epoxy Hardener Material Safety Data Sheet (MSDS)

AB-312 Epoxy Hardener Material Safety Data Sheet (MSDS)

B-31 Epoxy Hardener Material Safety Data Sheet (MSDS)


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