RBC #4300 is a lower viscosity version of RBC #4100. It offers the same thermal conductive properties, excellent electrical insulation, high heat dissipation and low shrinkage as #4100. Being lower in viscosity it offers better wetting properties and intricate components. RBC #4300 can be cured at room temperature or elevated temperatures to fit a variety of applications. It can be used as heat sink for large castings or as an encapsulant for heat generating components.
Mixed Viscosity @ 25oC,cps: 1,700
Shelf Life, (closed Container @ 25oC): 12 Months
Specific Gravity @ 25oC: 1.80
Hardness, Shore D: 90
Linear Shrinkage, in./in.: 0.003
Moisture Absorption 10 Days @ 25oC, %: 0.55
Izod Impact Strength, ft. lbs./in. of notch: 0.30
Tensile Strength @ 25oC, psi: 7,100
Compressive Strength @ 25oC, psi: 25,000
Thermal Conductivity, cal/sec/cm2/oC/cm X 10-4: 29.7
Thermal Stability, 1000 Hrs. @ 175oC, % Wt. Loss: 0.40
Coefficient of Thermal Expansion, in./in./oC X 10-6: 27
Heat Distortion Temperature, oC: 60
Operating Temperature Range, oC: -55 to 130
Volume Resistivity @ 25oC, ohm-cm: 4×1016
Dielectric Strength, volts/mil: 480
Dielectric Constant @ 25oC, 100 KC: 5.8
Dissipation Factor @ 25oC, 100 KC: 0.018
The above properties are typical of a system cured with Hardener AB-56.
AB-56: A rigid, room temperature curing system with limited pot life and fast cure.
A-121: 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.
Weigh the desired amount of #4300 Resin into a clean container and combine with recommended hardener in the proper ratio as shown below.
|Hardener||Parts by Weight
per 100 pts. Resin
100 grams @ 25oC
|Hardener||Cure @ 25oC||Cure @ 65oC||Cure @ 100oC||Cure @ 130oC|
|A-56||24 hours||1 hour||—||—|
|A-121||24 hours||2 hours||—||—|
|AB-312||—||6 hours||5 hours||3 hours|