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Metal adhesives

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Tra-Con Tra-Cast 3107 Low Shrinkage Epoxy Casting System
Categories: Polymer; Adhesive; Thermoset; Epoxy

Material Notes: TRA-CAST 3107 is a versatile epoxy casting system developed for high performance production potting, encapsulating, casting and tooling applications where low shrinkage, easy handling and flowability, and excellent mechanical and electrical properties are required. This formulation has a good pot life and low exotherm properties, and cure at room temperature to a tough, rigid, solid with very low shrinkage characteristics and excellent dimensional stability over a wide temperature range. TRA-CAST 3107 adheres to rigid plastics and laminates, metals, and ceramics, has a low coefficient of thermal expansion, and is readily machined and shaped with ordinary shop tools. The fully cured epoxy system is an excellent electrical insulator which provides good resistance to electrolysis, leakage, and corrosion from water, weather, gases and vapors, and from chemical compounds including mild acids and alkalis, many corrosive salts and salt solutions, petroleum product and lubricants, and other organic and inorganic materials.

Information provided by Tra-Con Inc.

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Physical PropertiesOriginal ValueComments
Specific Gravity 1.59 g/ccMixed
Volatile Organic Compounds (VOC) Content 11.62 g/l
Water Absorption 0.0010 %After 24 hours
Viscosity 22500 cP
@Temperature 25.0 °C
Mixed (sp #6, 10 rpm)
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore D 8524 hrs @ 25°C
 874 hrs @ 25°C + 2 hrs @ 65°C
Tensile Strength, Yield 8200 psi
Elongation at Yield 2.0 %
Compressive Strength 10800 psi
Adhesive Bond Strength 2600 psiLap shear, alum to alum, 4 hrs @ 25°C + 2 hrs @ 65°C
 2850 psiLap shear, alum to alum, 24 hrs @ 25°C
 
Electrical PropertiesOriginal ValueComments
Volume Resistivity 4.80e+15 ohm-cm
Dielectric Constant 4.2
@Frequency 1000 Hz
Dielectric Strength 410 V/mil
Dissipation Factor 0.010
@Frequency 1000 Hz
 
Thermal PropertiesOriginal ValueComments
CTE, linear 66.7 µm/m-°CBelow Tg
 183 µm/m-°CAbove Tg
Maximum Service Temperature, Air 125 °C
Minimum Service Temperature, Air -70.0 °C
Glass Transition Temp, Tg 63.0 °CUltimate Tg
 
Processing PropertiesOriginal ValueComments
Cure Time 6.00 hour4 hrs @ 25°C + 2 hrs @ 65°C
 24.0 hour
@Temperature 25.0 °C
Pot Life 60 min25 grams
 90 min100 grams
 
Descriptive Properties
Color Black
Mix Ratio, parts by weight100/50Resin/Hardener
Thixotropic Index 1.710 rpm/100 rpm
Working Life hours 2100 grams

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PTRAC103 / 71031

Metal adhesives

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