3M 1838 B/A Green

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Description for 3M 1838 B/A Green

Long worklife rigid epoxy • 8-12 hrs. handling strength • Meets MIL-A-23941A • Excellent environmental resistance

Application Type	Bond
1 Part or 2 Part	2 Part
Material Form	Liquid
Substrate	Aluminum, Glass, Many Metal, Some Plastic, Rubbers, Cold rolled Steel, Woods, Stainless Steel, Stainless Steel, Epoxy, 2024 T3 clad aluminum , Steel
Manufacturer	3M
Chemistry	Epoxy
Application Method	Trowel, Spatula
Cure Method	Base/Accelerator
Cure Temperature (°C)	20 to 25, 24, 66, 93
Cure Time (min)	10,080, 120, 30
Color	Green
Chemical Resistance	Hydraulic Oil, Tap Water, White Gas
High Temperature Resistance (°C)	82
Low Temperature Resistance (°C)	-55
Key Specifications	Mil-Spec (United States Military Standard): MIL-A-23941A; Mil-0-5606

Best Practices for 3M 1838 B/A Green

*See Terms of Use Below

Surface Preparation

For high strength structural bonds, paint, oxide films, oils, dust, mold release agents and all other surface contaminants must be completely removed. The amount of surface preparation directly depends on the user’s required bond strength and environmental aging resistance. For suggested surface preparations on common substrates, see the section on Surface Preparation
Application

Application to the substrates should be made within 1 hour for 3M™ Scotch-Weld™ Epoxy Adhesives 1838 B/A Green and Tan and 90 minutes for Scotch-Weld 1838-L B/A adhesive. Larger quantities and/or higher temperatures will reduce this working time.

For maximum bond strength apply product evenly to both surfaces to be joined.

Join the adhesive coated surfaces and allow to cure until completely firm. Overnight curing @75°F (24°C) is usually sufficient. Heat, up to 200°F (100°C),will speed curing.

Keep parts from moving during cure. Contact pressure is necessary. Maximum shear strength is obtained with a 3-5 mil bond line.
Mixing

This products consist of two parts. Mix thoroughly by weight or volume in proportions specified on product label or in Typical Uncured Physical Properties section below. Resulting color should be uniform. Properly reseal containers.
Clean-Up

Solvent wipe with acetone or MEK.*

*Note: When using solvents or chemicals, be sure to extinguish all ignition sources and follow the manufacturer’s precautions and directions for use when handling such materials.

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Technical Data

Overview

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Specifications

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Best Practices

*See Terms of Use Below
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Comparable Materials

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Fixture or Handling Strength Time Test Methods

Fixture or Handling Strength Time	Fixture-Handling Strength Time Temperature
360 to 600 min	25°C
15 to 20 min	66°C

Work / Pot Time Test Methods

Work / Pot Time	Test Method	Temperature
60 min	Mixed 100 (gms)	23°C
Long

Peel Strength Test Methods

Peel Strength	Type	Substrate	Test Temperature	Test Method
2 piw	T-Peel strength	2024 T3 clad aluminum	-55°C	T-Peel bonds were measured on 1 in. wide specimens cut from two FPL etched 8 in. x 8 in. x .032 in., 2024 T3 clad aluminum panels bonded together. The separation note of the testing jaws was 20 in./minute. Tests similar to ASTM D-1876
4 piw	T-Peel Strength	2024 T3 clad aluminum	24°C	T-Peel bonds were measured on 1 in. wide specimens cut from two FPL etched 8 in. x 8 in. x .032 in., 2024 T3 clad aluminum panels bonded together. The separation note of the testing jaws was 20 in./minute. Tests similar to ASTM D-1876
4 piw	T-Peel strength	2024 T3 clad aluminum	82°C	T-Peel bonds were measured on 1 in. wide specimens cut from two FPL etched 8 in. x 8 in. x .032 in., 2024 T3 clad aluminum panels bonded together. The separation note of the testing jaws was 20 in./minute. Tests similar to ASTM D-1876

Tensile Strength Test Methods

Tensile Strength	Test Method
4,290 psi	Cured, Ultimate

Shear Strength Test Methods

Shear Strength	Type	Substrate	Chemical	Test Temperature	Test Humidity	Test Method
High
1,500 psi	Overlap shear strength	2024 T3 clad aluminum		-55°C		Overlap shear strength was measured on FPL etched 1 in. wide by 1/2 in. overlap specimens. The bonds were made from 2 panels of 4 in. x 7 in. x .063 in., 2024 T3 clad aluminum bonded together and cut into 1 in. wide specimens. The separation rate of the testing jaws was .1 in./minute. Tests similar to ASTM D-1002.
3,000 psi	Overlap shear strength	2024 T3 clad aluminum		24°C		Overlap shear strength was measured on FPL etched 1 in. wide by 1/2 in. overlap specimens. The bonds were made from 2 panels of 4 in. x 7 in. x .063 in., 2024 T3 clad aluminum bonded together and cut into 1 in. wide specimens. The separation rate of the testing jaws was .1 in./minute. Tests similar to ASTM D-1002.
500 psi	Overlap shear sterngth	2024 T3 clad aluminum		82°C		Overlap shear strength was measured on FPL etched 1 in. wide by 1/2 in. overlap specimens. The bonds were made from 2 panels of 4 in. x 7 in. x .063 in., 2024 T3 clad aluminum bonded together and cut into 1 in. wide specimens. The separation rate of the testing jaws was .1 in./minute. Tests similar to ASTM D-1002.
2,000 to 2,200 psi	Overlap shear strength	Cold Rolled Steel		24°C		Overlap shear on cold rolled steel (20 gauge), 302 stainless steel (50 mils thick), and 2024 T3 clad aluminum (63 mils thick) in various environments after 365 days aging. All substrates were sandblasted prior to bonding. Data are in psi and tested at 75°F (24°C).
1,950 psi	Overlap shear strength	Cold Rolled Steel	Tap water	24°C		Overlap shear on cold rolled steel (20 gauge), 302 stainless steel (50 mils thick), and 2024 T3 clad aluminum (63 mils thick) in various environments after 365 days aging. All substrates were sandblasted prior to bonding. Data are in psi and tested at 75°F (24°C).
2,200 psi	Overlap shear strength	Cold Rolled Steel		49°C	100 %	Overlap shear on cold rolled steel (20 gauge), 302 stainless steel (50 mils thick), and 2024 T3 clad aluminum (63 mils thick) in various environments after 365 days aging. All substrates were sandblasted prior to bonding. Data are in psi and tested at 75°F (24°C)., RH
2,250 psi	Overlap shear strength	Cold Rolled Steel	Hydraulic Oil (Mil-0-5606)	24°C		Overlap shear on cold rolled steel (20 gauge), 302 stainless steel (50 mils thick), and 2024 T3 clad aluminum (63 mils thick) in various environments after 365 days aging. All substrates were sandblasted prior to bonding. Data are in psi and tested at 75°F (24°C).
1,100 psi	Overlap shear strength	Cold Rolled Steel	White Gas	24°C		Overlap shear on cold rolled steel (20 gauge), 302 stainless steel (50 mils thick), and 2024 T3 clad aluminum (63 mils thick) in various environments after 365 days aging. All substrates were sandblasted prior to bonding. Data are in psi and tested at 75°F (24°C).
3,400 to 3,800 psi	Overlap shear strength	Stainless Steel		24°C		Overlap shear on cold rolled steel (20 gauge), 302 stainless steel (50 mils thick), and 2024 T3 clad aluminum (63 mils thick) in various environments after 365 days aging. All substrates were sandblasted prior to bonding. Data are in psi and tested at 75°F (24°C).
2,750 psi	Overlap shear strength	Stainless Steel	Tap water	24°C		Overlap shear on cold rolled steel (20 gauge), 302 stainless steel (50 mils thick), and 2024 T3 clad aluminum (63 mils thick) in various environments after 365 days aging. All substrates were sandblasted prior to bonding. Data are in psi and tested at 75°F (24°C).
1,250 psi	Overlap shear strength	Stainless Steel		49°C	100 %	Overlap shear on cold rolled steel (20 gauge), 302 stainless steel (50 mils thick), and 2024 T3 clad aluminum (63 mils thick) in various environments after 365 days aging. All substrates were sandblasted prior to bonding. Data are in psi and tested at 75°F (24°C)., RH
3,600 psi	Overlap shear strength	Stainless Steel	Hydraulic Oil (Mil-0-5606)	49°C		Overlap shear on cold rolled steel (20 gauge), 302 stainless steel (50 mils thick), and 2024 T3 clad aluminum (63 mils thick) in various environments after 365 days aging. All substrates were sandblasted prior to bonding. Data are in psi and tested at 75°F (24°C).
3,250 psi	Overlap shear strength	Stainless Steel	White Gas	24°C		Overlap shear on cold rolled steel (20 gauge), 302 stainless steel (50 mils thick), and 2024 T3 clad aluminum (63 mils thick) in various environments after 365 days aging. All substrates were sandblasted prior to bonding. Data are in psi and tested at 75°F (24°C).
2,400 to 2,500 psi	Overlap shear strength	Aluminum		24°C		Overlap shear on cold rolled steel (20 gauge), 302 stainless steel (50 mils thick), and 2024 T3 clad aluminum (63 mils thick) in various environments after 365 days aging. All substrates were sandblasted prior to bonding. Data are in psi and tested at 75°F (24°C).
2,250 psi	Overlap shear strength	Aluminum	Tap water	24°C		Overlap shear on cold rolled steel (20 gauge), 302 stainless steel (50 mils thick), and 2024 T3 clad aluminum (63 mils thick) in various environments after 365 days aging. All substrates were sandblasted prior to bonding. Data are in psi and tested at 75°F (24°C).
1,050 psi	Overlap shear strength	Aluminum		49°C	100 %	Overlap shear on cold rolled steel (20 gauge), 302 stainless steel (50 mils thick), and 2024 T3 clad aluminum (63 mils thick) in various environments after 365 days aging. All substrates were sandblasted prior to bonding. Data are in psi and tested at 75°F (24°C)., RH
2,900 psi	Overlap shear strength	Aluminum	Hydraulic Oil (Mil-0-5606)	24°C		Overlap shear on cold rolled steel (20 gauge), 302 stainless steel (50 mils thick), and 2024 T3 clad aluminum (63 mils thick) in various environments after 365 days aging. All substrates were sandblasted prior to bonding. Data are in psi and tested at 75°F (24°C).
2,150 psi	Overlap shear strength	Aluminum	White Gas	24°C		Overlap shear on cold rolled steel (20 gauge), 302 stainless steel (50 mils thick), and 2024 T3 clad aluminum (63 mils thick) in various environments after 365 days aging. All substrates were sandblasted prior to bonding. Data are in psi and tested at 75°F (24°C).

Dielectric Constant Test Methods

Dielectric Constant	Temperature	Test Method
6.06	24°C	Cured, 1 KHz

Dissipation Factor Test Methods

Dissipation Factor	Temperature	Test Method
0.01200	24°C	Cured, 1 KHz

Thermal Conductivity Test Methods

Thermal Conductivity	Test Method
0.29 W/m°K	Cured

Volume Resistivity Test Methods

Volume Resistivity	Temp (°C)	Test Method
1.5e15 (ohms/cm)	24°C	Cured

Elongation Test Methods

Elongation	Test Method
2 to 3 %	Cured, Approx.

Modulus Test Methods

Modulus	Test Method
344,000 psi	Cured, Elasticity

Shore D Hardness Test Methods

Shore D Hardness	Shore Hardness Test Method
80 to 85	Cured, Approx.

Coefficient of Thermal Expansion (CTE) Test Methods

Coefficient of Thermal Expansion (CTE)	CTE Temperature (°C)	CTE Test Method
79e-6 (in./ in/°C)	0 to 6°C	Cured

Glass Transition Temp (Tg) Test Methods

Glass Transition Temp (Tg)	Glass Transition Temperature (Tg) Test Method
55°C	Cured

3M 1838 B/A Green

Description for 3M 1838 B/A Green

Best Practices for 3M 1838 B/A Green

Surface Preparation

Application

Mixing

Clean-Up

Register for FREE to view more details

Why register?

Sign up now Already registered? Sign in!

Technical Data

Overview

magna laoreet elit.

dolor elit.

magna dolore sed.

lorem dolore magna ipsum.

diam laoreet dolor diam.

nonummy.

sit aliquam aliquam euismod.

Specifications

adipiscing consectetuer sed.

nibh amet consectetuer.

sed erat.

nonummy.

dolore magna laoreet aliquam.

sit lorem amet diam.

diam euismod.

Best Practices

magna dolor elit ut lorem.

tincidunt laoreet sit ut nonummy.

sit dolore tincidunt nibh dolore.

ipsum laoreet dolore.

diam erat nonummy sed dolor.

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Gluespec Poll

What level of expertise do you have in specialty chemicals like adhesives, sealants, conformal coatings, etc.?

Fixture or Handling Strength Time Test Methods

Work / Pot Time Test Methods

Peel Strength Test Methods

Tensile Strength Test Methods

Shear Strength Test Methods

Dielectric Constant Test Methods

Dissipation Factor Test Methods

Thermal Conductivity Test Methods

Volume Resistivity Test Methods

Elongation Test Methods

Modulus Test Methods

Shore D Hardness Test Methods

Coefficient of Thermal Expansion (CTE) Test Methods

Glass Transition Temp (Tg) Test Methods

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