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Metal adhesives

Resinlab® EP691 Unfilled Electronic Grade Epoxy Encapsulant
Categories: Polymer; Thermoset; Epoxy; Epoxy Cure Resin; Epoxy Encapsulant, Unreinforced

Material Notes: Resinlab™ EP691 is a two part unfilled electronic grade epoxy encapsulant designed for medium sized castings. It cures at room temperature to a tough, semi-rigid polymer. It has good wetting and adhesion to most surfaces and is free flowing to penetrate voids and give good air release and a smooth high gloss surface. It has very good resistance to water, acids and bases and most organic solvents. It was especially formulated to a 2A:1B volume mix ratio for use in side-by-side dispensing cartridges and meter/mix and dispense equipment. EP691 will reach full cure at room temperature within 24 hours. Cure time can be accelerated by the application of heat after product has gelled. Times and temperatures from 1 hour at 65°C to 20 minutes at 100°C are typical for small castings (less than 50 grams).

Information Provided by Resinlab L.L.C., an Ellsworth Adhesives Company.

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Physical PropertiesMetricEnglishComments
Specific Gravity 1.00 g/cc1.00 g/ccPart B; TM R050-16
 1.11 g/cc1.11 g/ccMixed; TM R050-16
 1.16 g/cc1.16 g/ccPart A; TM R050-16
Water Absorption 0.17 %
@Time 86400 sec
0.17 %
@Time 24.0 hour
TM R050-35
Viscosity 2500 cP2500 cPPart B, RVT, #2, 20 rpm; TM R050-12
 9000 cP9000 cPMixed; TM R050-12
 16000 cP16000 cPPart A, RVT, #6, 20 rpm; TM R050-12
 
Mechanical PropertiesMetricEnglishComments
Hardness, Shore D 8080TM R050-17
Tensile Strength at Break 51.7 MPa7500 psiTM R050-36
Tensile Strength, Ultimate 58.6 MPa8500 psiTM R050-36
Tensile Strength, Yield 48.3 MPa7000 psiTM R050-36
Elongation at Break 4.0 - 9.0 %4.0 - 9.0 %TM R050-36
Tensile Modulus 2.76 GPa400 ksiTM R050-36
Compressive Yield Strength 79.3 MPa11500 psiTM R050-38
Compressive Strength 172 MPa25000 psiUltimate; TM R050-38
 172 MPa25000 psiBreak; TM R050-38
Compressive Modulus 2.90 GPa420 ksiTM R050-38
Adhesive Bond Strength 13.8 MPa2000 psiLap shear; 2024 T3 Al Abraded / MEK Wipe; TM R050-37
 
Electrical PropertiesMetricEnglishComments
Volume Resistivity 8.00e+14 ohm-cm8.00e+14 ohm-cm
Dielectric Constant 4.2
@Frequency 100 Hz,
Temperature 25.0 °C
4.2
@Frequency 100 Hz,
Temperature 77.0 °F
Dielectric Strength 16.1 kV/mm410 kV/in
 
Thermal PropertiesMetricEnglishComments
CTE, linear 54.0 µm/m-°C30.0 µin/in-°F
Thermal Conductivity 0.140 W/m-K0.972 BTU-in/hr-ft²-°F
Maximum Service Temperature, Air 121 °C250 °F
Minimum Service Temperature, Air -40.0 °C-40.0 °F
Glass Transition Temp, Tg 80.0 °C176 °FTM R050-25
 
Processing PropertiesMetricEnglishComments
Pot Life >= 120 min>= 120 minMass: 50g; TM R050-19
 
Descriptive Properties
ColorLight Amber
Mix Ratio100:45Weight
 2:1Volume

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