RBC-4503 is a low viscosity, UL listed epoxy for 94 V-O flame retardency. It is designed for applications where thermal conductivity, excellent electrical insulation, high heat distortion and superior thermal shock properties are required. RBC-4503 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.
Mixed Viscosity @ 25oC,cps: 3,300
Mixed Viscosity @ 60oC,cps: 700
Shelf Life, (closed Container @ 25oC): 12 Months
Color: Black
Specific Gravity @ 25oC: 1.48
Hardness, Shore D: 87
Linear Shrinkage, in./in.: 0.003
Moisture Absorption 24 hr. water boil, %: 3.8
Izod Impact Strength, ft. lbs./in. of notch: 0.28
Tensile Strength @ 25oC, psi: 8,100
Compressive Strength @ 25oC, psi: 19,100
Thermal Conductivity, cal/sec/cm2/oC/cm X 10-4: 27.3
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
Volume Resistivity @ 25oC, ohm-c: 5×1016
Dielectric Strength, volts/mil: 480
Dielectric Constant @ 25oC, 100 KC: 5.7
Dissipation Factor @ 25oC, 100 KC: 0.018
The above properties are typical of a system cured with Hardener A-122
AB-56: A fast, room temperature curing system with good chemical and thermal properties.
A-122: 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-4503 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-122 | 13 | 3 hours |
Recommended Cure Schedule:
| Hardener | Cure @ 25oC | Cure @ 65oC | Cure @ 100oC | Cure @ 130oC |
| AB-56 | 6 hours | 10 minutes | — | — |
| A-122 | 24 hours | 3 hours | 2 hours | 1 hour |
