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Description for Henkel Armstrong A-12 Epoxy Resin 3:2
A general purpose adhesive, combines low toxicity with good physical properties. This two-part adhesive has a non-critical mixing ratio with 1:1 used most frequently. The mix ratio can be varied to obtain a more flexible or more rigid bond by increasing or decreasing respectively, the concentration of Part B.Brand Loctite, Armstrong Application Type Bond 1 Part or 2 Part 2-Part Material Form Liquid Substrate Al, Ceramics, Metals, Plastics, Woods Industry General purpose Manufacturer Henkel Chemistry Epoxy Cure Method 2-Part Cure Cure Temperature (°C) 93, 149, 25, 25 Cure Time (min) 30, 5.00, 60, Overnight Viscosity (cPs) 80,000 -
Technical Data for Henkel Armstrong A-12 Epoxy Resin 3:2
Overview
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Application Type
- Adhesive - Bond
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1 Part or 2 Part
- 2-Part
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Material Form
- Liquid
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Industry
- Industrial - Cryogenic applications
- General Purpose
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Chemistry
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Cure Method
- 2-Part Cure
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Brand
- Armstrong
- Loctite
Specifications
Cure Specs
Cure Temperature (°C) 93, 149, 25, 25 Test Method Cure Time (min) 30, 5.00, 60, Overnight Test Method Viscosity (cPs) 80,000 Test Method Work / Pot Time (min) 120, 60 Test Method Mix Ratio 3:2 (by volume), 3:2 (by weight) Bond Strength
General Bond Strength (psi) 2,500 Test Method Cleavage Strength (psi) 1,600 Test Method Tensile Strength (psi) 4,200, 2,000, 2,500, 2,500 Test Method Hardness
Elongation (%) <6 Test Method Flexibility Flexible, Rigid Other Properties
Specific Gravity 1.310 Test Method Coefficient of Thermal Expansion (CTE) 3.5e-5 (in./ in/°F) Test Method Business Information
Shelf Life Details Shelf life is one year when stored below 90°F out of sunlight and in original unopened containers of pints or greater. Shelf life will vary with specialty packages. Shelf Life Temperature (°F) <90 Shelf Life (mon) 12 -
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Best Practices for Henkel Armstrong A-12 Epoxy Resin 3:2
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Surface Preparation
The surfaces to be bonded should be clean and dry (for critical applications refer to our suggested surface preparation procedures - Bulletin No. 964)
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Application
Apply the adhesive to surfaces to be bonded (preferably both surfaces) and press together. Light clamping may be used to keep parts in position during curing.
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Mixing
Thoroughly mix the A-12 Part B with the A-12 part A in a clean discardable container using correct mix ratio. Avoid the introduction of excess air.
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Cure Temperature Test Methods
Cure Temperature | Cure Time Test Method |
---|---|
93°C | Optimum cure,Elevated Temperature |
149°C | Fast cure, Elevated Temperature |
25°C | Optimum cure, Room Temperature |
25°C | Fast cure, Room Temperature |
Cure Time Test Methods
Cure Time | Test Method |
---|---|
30 min | Optimum cure,Elevated Temperature |
5.00 min | Fast cure, Elevated Temperature |
60 min | Optimum cure, Room Temperature |
Overnight | Fast cure, Room Temperature |
Viscosity Test Methods
Viscosity | Test Method |
---|---|
80,000 cPs | Mixed, uncured |
Work / Pot Time Test Methods
Work / Pot Time | Test Method | Temperature |
---|---|---|
120 min | 100 gms | 25°C |
60 min | 1# | 25°C |
Cleavage Strength Test Methods
Cleavage Strength | Cure Time | Cure Temperature | Test Method |
---|---|---|---|
1,600 psi | 20 min | 93°C | Cured |
General Bond Strength Test Methods
General Bond Strength | Cure Time | Cure Temperature | Test Method |
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2,500 psi | 20 min | 93°C | Cured |
Tensile Strength Test Methods
Tensile Strength | Cure Time | Cure Temperature | Substrate | Test Temperature |
---|---|---|---|---|
4,200 psi | 20 min | 93°C | Al./Al. | 25°C |
2,000 psi | 20 min | 93°C | Al./Al. | 82°C |
2,500 psi | 20 min | 93°C | Al./Al. | -51°C |
2,500 psi | 20 min | 93°C |
Elongation Test Methods
Elongation | Test Method |
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<6 % | Maximum, Cured |
Coefficient of Thermal Expansion (CTE) Test Methods
Coefficient of Thermal Expansion (CTE) | CTE Test Method |
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3.5e-5 (in./ in/°F) | Cured |
Specific Gravity Test Methods
Specific Gravity | Temperature | Test Method |
---|---|---|
1.310 | 25°C | Cured |

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