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Metal adhesives

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Armstrong A-12 Epoxy Adhesive, at 2:3 Mix Ratio
Categories: Polymer; Adhesive; Thermoset; Epoxy; Epoxy Adhesive

Material Notes: Our most popular general-purpose, high viscosity adhesive for industry. Combines low toxicity with excellent physical properties, and offers a non-critical mixing ratio of 1:1 by weight. This ratio can be altered to achieve improved bond properties at elevated or cryogenic temperatures. Adhesive and curing agent are easily mixed and are of different colors for visual assurance of thorough mixing. A-12 meets the requirements of Mil Spec. MIL-A-47074 (MI) Type 1, Class 2.

Information provided by Ellsworth Adhesives.

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Physical PropertiesOriginal ValueComments
Viscosity 80000 cPMixed
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore D 77
Tensile Strength, Ultimate 3500 psiafter optimum cure
Elongation at Break 11.2 %
Adhesive Bond Strength 4050 psiSteel-Steel; after optimum cure
 800 psi
@Temperature 82.2 °C
Aluminum-Aluminum tensile shear
 3050 psi
@Temperature -54.4 °C
Aluminum-Aluminum tensile shear
 3900 psi
@Temperature 25.0 °C
Aluminum-Aluminum tensile shear
 
Thermal PropertiesOriginal ValueComments
CTE, linear 28.0 µm/m-°C
@Temperature 20.0 °C
Glass Transition Temp, Tg 63.0 °C
 
Processing PropertiesOriginal ValueComments
Processing Temperature 72.0 °F
 165 °FOptimum cure is 2 hr. @ 165°F
 165 °FFast cure is 20 min @ 165°F
Pot Life <= 90.0 min
@Temperature 25.0 °C
100 g
 
Descriptive Properties
ColorBrown
Mix Ratio2/3By Weight

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Metal adhesives

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