RBC-4501 Resin

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Electronics
, Thermally Conductive, UL Listed
3 hours
Pot Life
9,500
Mixed Viscosity (cps)
30.0
Thermal Conductivity
(cal/sec/cm2/°C/cm X 10-4)
-65 to 130
Operating Temperature Range (°C)

RBC-4501 is a low viscosity, UL listed epoxy for 94 V-O flame retardancy. It is designed for applications where thermal conductivity, excellent electrical insulation, high heat distortion and superior thermal shock properties are required. RBC-4501 can be cured at room temperature or elevated temperature to fit a variety of applications. It can be used as a heat sink for large castings or as an encapsulant for heat generating components. AB-56 hardener can be used for applications requiring fast cures.

HANDLING PROPERTIES:

Mixed Viscosity @ 25oC,cps: 9,500
Shelf Life, (closed Container @ 25oC): 12 Months

PHYSICAL PROPERTIES (CURED):

Color: Black
Specific Gravity @ 25oC: 1.44
Hardness, Shore D: 87
Linear Shrinkage, in./in.: 0.004
Moisture Absorption 24 hr. water boil, %: 1.3
Izod Impact Strength, ft. lbs./in. of notch: 0.25
Tensile Strength @ 25oC, psi: 6,300
Compressive Strength @ 25oC, psi: 15,950

THERMAL PROPERTIES (CURED):

Thermal Conductivity, cal/sec/cm2/oC/cm X 10-4: 30
Thermal Stability, 1000 Hrs. @ 175oC, % Wt. Loss: 0.35
Coefficient of Thermal Expansion, in./in./oC X 10-6: 27
Heat Distortion temperature, oC: 53
Operating Temperature Range, oC: -65 to 130

ELECTRICAL PROPERTIES (CURED):

Volume Resistivity @ 25oC, ohm-cm: 5×1016
Dielectric Strength, volts/mil: 480
Dielectric Constant @ 25oC, 100 KC: 5.7
Dissipation Factor @ 25oC, 100 K: 0.018
 
The above properties are typical of a system cured with Hardener AB-56

RECOMMENDED HARDENERS:

AB-56: A fast, room temperature curing system with good chemical and thermal properties.

A-121: A resilient, low viscosity system with slightly longer pot life, that exhibits excellent resistance to thermal shock.

MIXING INSTRUCTIONS:

Weigh the desired amount of RBC-4501 into a clean container and combine with recommended hardener in the proper ratio as shown below.

Hardener  Parts by Weight per 100 pts. Resin Pot Life 100 grams 25oC
AB-56 20 15-30 minutes
A-121 12 3 hours

RECOMMENDED CURE SCHEDULE

Hardener Cure @ 25oC Cure @ 65oC Cure @ 100oC Cure @ 130o
AB-56 6 hours  10 minutes 
A-121 24 hours  3 hours  2 hours  1 hour