RBC-4500 Resin

Electronics
, Thermally Conductive
5 hours
Pot Life
13,000
Mixed Viscosity (cps)
25.0
Thermal Conductivity
(cal/sec/cm2/°C/cm X 10-4)
-65 to 155
Operating Temperature Range (°C)

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.

HANDLING PROPERTIES

Mixed Viscosity @ 25oC,cps: 13,000
Shelf Life, (closed Container @ 25oC): 12 Months

PHYSICAL PROPERTIES (CURED):

Color: Black
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 PROPERTIES (CURED):

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

ELECTRICAL PROPERTIES (CURED):

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

RECOMMENDED HARDENERS

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.
 

MIXING INSTRUCTIONS

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
Pot Life 
100 grams @ 25oC
AB-56 20.0 15-30 Minutes
A-121 12.0 3 Hours
AB-312 13.0 2 Hours

RECOMMENDED CURE SCHEDULE

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