RBC-3500 Technical Data Sheet

Type :

Electronics

RBC-3500 is a medium viscosity, filled epoxy casting resin offering low shrinkage and good machineability. It can be cured at room temperature or elevated temperatures depending upon the epoxy hardener selected and the properties required. The epoxy resin itself can be warmed slightly before the addition of epoxy hardener to facilitate mixing. With proper hardener selection, #3500 epoxy resin can be used for very large as well as very small, intricate castings where good flowability and excellent air release are required.

HANDLING PROPERTIES:
Mixed Viscosity @ 25^oC, cps Shelf Life, (closed Container @ 25^oC)	4,400 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	Black 1.60 90 0.002 0.19 0.40 6,900 28,700
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	8.4 0.50 29 150 -65 to 155
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	5x10¹⁶ 475 3.90 0.018

(Note: The above properties are typical of a system cured with hardener #AB-312.)

RECOMMENDED HARDENERS:
A-110: A rigid, room temperature curing system with limited pot life and fast cure.
A-120: A resilient, low viscosity system with slightly longer pot life, that exhibits excellent resistance to thermal shock.
AB-312: Good resistance to heat, chemicals, thermal and mechanical shock, and good electrical properties at high humidity.

MIXING INSTRUCTIONS:
Weigh the desired amount of #3500 Resin into a clean container and combine with recommended hardener in one of the ratios shown below.


Hardener	Parts by wt.	Pot Life
	per 100 pts. resin	100 grms. @ 25^oC
A-110	5.7	1 hr.
A-120	12.2	2 hrs.
AB-312	13.0	4 hrs.


RECOMMENDED CURE SCHEDULE:
Hardener	Cure @ 25^oC	Cure @ 65^oC	Cure @ 100^oC	Cure @ 130^oC
A-110	24 HRS.	2 HRS.	-	-
A-120	24 HRS.	2 HRS.	-	-
AB-312	-	6 HRS.	5 HRS.	3 HRS.

ASSOCIATED PUBLICATIONS:
RBC-3500 Epoxy Resin Material Safety Data Sheet (MSDS)

A-110 Epoxy Hardener Material Safety Data Sheet (MSDS)

A-120 Epoxy Hardener Material Safety Data Sheet (MSDS)

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