RBC-3425 is a filled, low viscosity casting epoxy resin which can be used for duplicating any size casting when used with the appropriate epoxy hardener. RBC-3425 when mixed with AB-312 hardener yields castings with excellent high temperature properties. Because these are 100% solids systems there is very little shrinkage.
Mixed Viscosity @ 25oC, cps: 950
Shelf Life, (closed Container @ 25oC): 12 months
Specific Gravity @ 25oC: 1.40
Hardness, Shore D: 87
Linear Shrinkage, in./in.: 0.003
Moisture Absorption 10 Days @ 25oC, %: 0.20
Izod Impact Strength, ft. lbs./in. of notch: 0.31
Tensile Strength @ 25oC, psi: 7,100
Compressive Strength @ 25oC, psi: 15,800
Thermal Conductivity, cal/sec/cm2/oC/cm X 10-4: 8.0
Thermal Stability, 1000 Hrs. @ 175oC, % Wt. Loss: 0.50
Coefficient of Thermal Expansion, in./in./oC X 10-6: 39
Heat Distortion Temperature, oC: 55
Operating Temperature Range, oC: -55 to 155
Volume Resistivity @ 25oC, ohm-cm: 8×1016
Dielectric Strength, volts/mil: 475
Dielectric Constant @ 25oC, 100 KC: 4.1
Dissipation Factor @ 25oC, 100 KC: 0.021
(Note: The above properties are typical of a system cured with hardener #B-31.)
AB-85: A fast set room temperature cure hardener used to make small castings. Can use heat for very fast cures.
AB-98: A medium set room temperature cure hardener with a good working time (90 minutes). Can be used to make small to medium size castings. Can also use heat for faster cures.
AB-312: A medium set room temperature or heat cure system that can withstand high temperatures (300oF). Can also use heat for faster cures.
B-31: A slow set heat cure system with a long working time (3 hours) offering excellent air release for pieces with undercuts.
Weigh the desired amount of #3425 Resin into a clean container and combine with recommended hardener in one of the ratios shown below.
|Hardener||Parts by Weight
per 100 pts. Resin
100 grams @ 25oC
|Hardener||Cure @ 25oC||Cure @ 65oC||Cure @ 100oC|
|AB-85||12 hours||30 minutes||—|
|AB-98||24 hours||1 hour||30 minutes|
|AB-312||24-36 hours||1 1/2 hours||1 hour|
|B-31||—||2 hours||1 hour|