RBC-4500 is a fire retardant version of RBC-4400 Resin. It is a medium viscosity, filled, thermally conductive resin which exhibits excellent adhesive properties making it useful for bonding thermally conductive, and heat generating components. It offers excellent chemical resistance and maintains superior bonding over a wide range of operating conditions. It can be cured at room temperature or at elevated temperatures depending upon the properties required.
Mixed Viscosity @ 25oC,cps: 13,000
Shelf Life, (closed Container @ 25oC): 12 Months
Specific Gravity @ 25oC:1.50
Hardness, Shore D: 90
Linear Shrinkage, in./in.: 0.003
Moisture Absorption 24 hr. water boil, % : 0.22
Izod Impact Strength, ft. lbs./in. of notch: 0.31
Tensile Strength @ 25oC, psi: 7,600
Compressive Strength @ 25oC, psi: 25,300
Thermal Conductivity, cal/sec/cm2/oC/cm X 10-4: 25.0
Thermal Stability, 1000 Hrs. @ 175oC, % Wt. Loss: 0.35
Coefficient of Thermal Expansion, in./in./oC X 10-6: 28
Heat Distortion temperature, oC: 155
Operating Temperature Range, oC: -65 to 155
Volume Resistivity @ 25oC, ohm-cm: x1016
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 AB-312
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.
AB-312 : Good resistance to heat, chemicals, thermal and mechanical shock, and good electrical properties at high humidity.
Weigh the desired amount of RBC-4500 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|
|AB-56||6 Hours||10 Minutes||---||---|
|A-121||24 Hours||3 Hours||2 Hours||1 Hour|
|AB-312||---||3 Hours||2 Hours||1 Hour|