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.
Mixed Viscosity @ 25oC,cps: 9,500
Shelf Life, (closed Container @ 25oC): 12 Months
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 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
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
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.
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 |
| Hardener | Cure @ 25oC | Cure @ 65oC | Cure @ 100oC | Cure @ 130oC |
| AB-56 | 6 hours | 10 minutes | — | — |
| A-121 | 24 hours | 3 hours | 2 hours | 1 hour |
