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Chemically Resistant adhesives

Lord Adhesives Thermoset/CoolTherm™ EP 340/70 Epoxy System Epoxy Resin System
Categories: Polymer; Thermoset; Epoxy; Epoxy Adhesive

Material Notes: LORD CoolTherm™ EP-340/70 epoxy system is a two-component system designed to provide maximum thermal conductivity and outstanding mechanical properties. CoolTherm EP-340/70 system offers a very low coefficient of thermal expansion and is appropriate for applications where the expansion and contraction of an epoxy encapsulation system must be maintained. Handling and cured properties of the two-component epoxy system are dependent on the hardener used with CoolTherm EP-340 epoxy resin.

Features: provides low viscosity and surface tension, enabling void-free casting without a vacuum step. provides a working life of over one hour; appropriate for cured system that experiences operating temperature of 130°C or below. cured system is UL 94 HB certified.

All information provided by Lord.

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Physical PropertiesMetricEnglishComments
Specific Gravity 1.01 g/cc1.01 g/ccHardener 70
 2.40 g/cc2.40 g/ccEP-340 Epoxy Resin
Viscosity  10000 cP
@Temperature 25.0 °C
10000 cP
@Temperature 77.0 °F
mixed
 300000 cP
@Temperature 25.0 °C
300000 cP
@Temperature 77.0 °F
EP-340 Epoxy Resin
 
Mechanical PropertiesMetricEnglishComments
Hardness, Shore D 9090cured
Tensile Strength 64.8 MPa
@Temperature 25.0 °C
9400 psi
@Temperature 77.0 °F
cured
Elongation at Break 4.1 %4.1 %cured
Flexural Strength 103 MPa15000 psi
Flexural Modulus 0.103 GPa15.0 ksiASTM 790
Compressive Yield Strength 110 MPa16000 psiASTM D 695
Izod Impact, Notched 0.256 J/cm0.480 ft-lb/inASTM D 256
 
Electrical PropertiesMetricEnglishComments
Volume Resistivity  3.00e+10 ohm-cm
@Temperature 130 °C
3.00e+10 ohm-cm
@Temperature 266 °F
cured; ASTM D 257
 4.00e+11 ohm-cm
@Temperature 105 °C
4.00e+11 ohm-cm
@Temperature 221 °F
cured; ASTM D 257
 6.00e+15 ohm-cm
@Temperature 25.0 °C
6.00e+15 ohm-cm
@Temperature 77.0 °F
cured; ASTM D 257
Dielectric Constant 3.4
@Frequency 1e+6 Hz,
Temperature 25.0 °C
3.4
@Frequency 1e+6 Hz,
Temperature 77.0 °F
cured; ASTM D 150
Dielectric Strength 16.9 kV/mm430 kV/incured; ASTM D 149
Dissipation Factor 0.034
@Frequency 1e+6 Hz,
Temperature 25.0 °C
0.034
@Frequency 1e+6 Hz,
Temperature 77.0 °F
cured; ASTM D 150
 
Thermal PropertiesMetricEnglishComments
CTE, linear 31.0 µm/m-°C17.2 µin/in-°Fcured
Thermal Conductivity 1.40 W/m-K9.72 BTU-in/hr-ft²-°Fcured
Maximum Service Temperature, Air 130 °C266 °F
Flammability, UL94 HBHB
 
Processing PropertiesMetricEnglishComments
Cure Time 1440 min
@Temperature 25.0 °C
24.0 hour
@Temperature 77.0 °F
mixed
Working Life 100 min
@Temperature 25.0 °C
100 min
@Temperature 77.0 °F
Mixed
Shelf Life  6.00 Month
@Temperature 25.0 °C
6.00 Month
@Temperature 77.0 °F
EP-340 Epoxy Resin
 24.0 Month
@Temperature 25.0 °C
24.0 Month
@Temperature 77.0 °F
Hardener 70
 
Descriptive Properties
AppearanceBlack LiquidEP-340 Epoxy Resin
 Tan LiquidHardener 70
Mix Ratio100 to 16.5Resin to hardener, by volume
 100 to 7Resin to hardener, by weight

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PLORD9249 / 232605

Chemically Resistant adhesives

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