3M Scotch-Weld Epoxy Adhesive 1838 B/A Green Datasheet 3M Scotch-Weld Epoxy Adhesive 1838 B/A Green

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  • Description for 3M Scotch-Weld Epoxy Adhesive 1838 B/A Green

    This epoxy adhesive is two-part, room temperature curing structural adhesive with high shear strengths and excellent environmental resistance. Excellent for bonding many metals, woods, and some plastics.

    *See Terms of Use Below

    Brand Scotch-weld
    Chemical Resistance Hydraulic oil, Chemical Resistance: Fluid Resistance: Tap water, White gas
    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, Epoxy, Stainless steel, 2024 T3 clad aluminum , Steel
    Manufacturer 3M
    Chemistry Epoxy
    Application Method Trowel, Spatula
    Cure Method 2-Part cure, Room temperature curing, Pressure sensitive
    Cure Temperature (°C) 20 to 25, 24, 66, 93, 23
    Cure Time (min) 10,080, 120, 30, 480
    Viscosity (cPs) Controlled flow
    Color Green (Cured)
    High Temperature Resistance (°C) 82
    Low Temperature Resistance (°C) -55
    Volume Resistivity (O) 1.5e15 (ohms-cm)
    Key Specifications Mil-Spec (United States Military Standard): MIL-A-23941A; Mil-0-5606, UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association): Recognized as meeting UL 94 HB, Registered to ISO 9001 standards

  • Technical Data for 3M Scotch-Weld Epoxy Adhesive 1838 B/A Green

    *See Terms of Use Below

    Overview
    • Chemical Resistance
      • Chemical Resistance : Fluid Resistance : Water Resistance - Tap water
      • Chemical Resistance - Hydraulic oil, White gas
    • Application Type
    • 1 Part or 2 Part
      • 2-Part
    • Material Form
      • Liquid
    • Substrate
    • Industry
      • Other - Structural adhesive
    • Chemistry
    • Application Method
      • Flow - Flow equipment
      • Spatula/Trowel - Spatula, Trowel
    • Cure Method
      • Room Temperature / Air Dry - Room temperature curing
      • Pressure Sensitive (min) - Pressure sensitive
      • 2-Part Cure
    • Color
      • Green - Green (Cured)
    • Key Specifications
      • International Organization for Standardization - Registered to ISO 9001 standards
      • Mil-Spec (United States Military Standard) : 5606 - MIL-A-23941A; Mil-0-5606
      • Mil-Spec (United States Military Standard) : A-21366A - MIL-A-23941A; Mil-0-5606
      • UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association) : UL 94 HB - Recognized as meeting UL 94 HB
    • Brand
      • Scotch-weld
    Specifications
    Cure Specs
    Cure Temperature (°C) 20 to 25, 24, 66, 93, 23 Test Method
    Cure Time (min) 10,080, 120, 30, 480 Test Method
    Viscosity (cPs) Controlled flow
    Fixture or Handling Strength Time (min) 360 to 600, 15 to 20 Test Method
    Work / Pot Time (min) 60, Long Test Method
    Open Time (min) 60
    Thixotropic Controlled
    Mix Ratio 4:5 (by volume), 1:1 (by weight)
    Bond Strength
    Structural/Load-Bearing Structural
    General Bond Strength (psi) Excellent
    Peel Strength (piw) 2 (lb/in width), 4 (lb/in width), 4 (lb/in width) Test Method
    Shear Strength (psi) High, 1,500, 3,000, 500, 2,000 to 2,200, 1,950, 2,200, 2,250, 1,100, 3,400 to 3,800, 2,750, 1,250, 3,600, 3,250, 2,400 to 2,500, 2,250, 1,050, 2,900, 2,150 Test Method
    Tensile Strength (psi) 4,290 Test Method
    Material Resistance
    Environmental Resistance Excellent
    High Temperature Resistance (°C) 82
    Low Temperature Resistance (°C) -55
    Moisture/Humidity Resistance Moisture/humidity resistance
    Conductivity
    Dissipation Factor 0.01200 Test Method
    Dielectric Strength (V/mil) 585
    Dielectric Constant 6.06 Test Method
    Thermal Conductivity (W/m°K) 0.29
    Volume Resistivity (O) 1.5e15 (ohms-cm) Test Method
    Hardness
    Shore D Hardness 82 Test Method
    Elongation (%) 2 to 3
    Flexibility Rigid
    Modulus (psi) 344,000 Test Method
    Other Properties
    Glass Transition Temp (Tg) (°C) 55 Test Method
    Coefficient of Thermal Expansion (CTE) 79e-6 (in./ in/°C) Test Method
    Business Information
    Shelf Life Details Store products at 80°F (27°C) or below for maximum shelf life. Higher temperatures reduce normal shelf life.; These products have a shelf life of 24 months from date of manufacture when properly stored in their unopened containers. Lower temperatures can cause increased viscosity of a temporary nature. Rotate stock on a “first in-first out” basis.
    Shelf Life Temperature (°F) 80
    Shelf Life Type From date of manufacture
    Shelf Life (mon) 24

  • Best Practices for 3M Scotch-Weld Epoxy Adhesive 1838 B/A Green

    *See Terms of Use Below

    1. 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.

      The following cleaning methods are suggested for common surfaces.

      Steel: 1. Wipe free of dust with oil-free solvent such as Methyl Ethyl Ketone (MEK).

      2. Sandblast or abrade using clean fine grit abrasives.

      3. Wipe again with solvents to remove loose particles.

      Aluminum: 1. Alkaline Degrease – Oakite 164 solution (9-11 oz./gallon water) at 190°F ± 10°F (88°C ± 5°C) for 10-20 minutes. Rinse immediately in large quantities of cold running water.

      1. Alkaline Degrease – Oakite 164 solution (9-11 oz./gallon water) at 190°F ± 10°F (88°C ± 5°C) for 10-20 minutes. Rinse immediately in large quantities of cold running water.

      2. Acid Etch – Place panels in the following solution for 10 minutes at 150°F ± 5°F (66°C ± 2°C).

      Sodium Dichromate 4.1 - 4.9 oz./gallon

      Sulfuric Acid, 66° 38.5 - 41.5 oz./gallon 2024-T3 aluminum (dissolved) 0.2 oz./gallon minimum Tap Water as needed to balance

      3. Rinse – Rinse panels in clear running tap water.

      4. Dry – Air dry 15 minutes

      force dry 10 minutes at 150°F ± 10°F (66°C ± 5°C).

      5. If primer is to be used, it should be applied within 4 hours after surface preparation.

      Plastics: 1. Solvent wipe with Isopropyl Alcohol.

      2. Abrade using clean fine grit abrasives.

      3. Solvent wipe with Isopropyl Alcohol.

      Rubbers: 1. Solvent wipe with MEK.

      2. Abrade using clean fine grit abrasives.

      3. Solvent wipe with MEK.

      Glass: 1. Solvent wipe with acetone or MEK.

      For glass applications which will be subjected to high moisture/humidity conditions, EC-3901 primer or equivalent should be used to prime the glass.

    2. Application

      Application Equipment: These products may be applied with spatula, trowel, or flow equipment.

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

      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.

    3. Mixing

      These 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.

    4. Curing

      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.

    5. 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.

  • Comparable Materials for 3M Scotch-Weld Epoxy Adhesive 1838 B/A Green

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    Spec Engine® Results

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Cure Temperature Test Methods
Cure Temperature Cure Time Test Method
20 to 25°C
24°C Full cure
66°C Full cure
93°C Full cure
23°C Full cure, Notes: The cure time is defined as that time required for the adhesive to achieve a minimum of 80% of the ultimate strength as measured by aluminum-aluminum OLS.
Cure Time Test Methods
Cure Time Test Method
10,080 min Full cure
120 min Full cure
30 min Full cure
480 min Full cure, Notes: The cure time is defined as that time required for the adhesive to achieve a minimum of 80% of the ultimate strength as measured by aluminum-aluminum OLS.
Fixture or Handling Strength Time Test Methods
Fixture or Handling Strength Time Fixture-Handling Strength Test Method Fixture-Handling Strength Time Temperature
360 to 600 min Handling strength 25°C
15 to 20 min Handling strength 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 Cure Temperature Substrate Test Temperature Test Method
2 (lb/in width) T-Peel strength -55°C 55C Aluminum -55°C T-peel adhesion, ASTM D1876, Notes: 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.
4 (lb/in width) T-Peel Strength 23°C 23C Aluminum 24°C T-peel adhesion, ASTM D1876, Notes: 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.
4 (lb/in width) T-Peel strength 82°C 82C Aluminum 82°C T-peel adhesion, ASTM D1876, Notes: 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.
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 22°C 1KHz, ASTM D150
Dissipation Factor Test Methods
Dissipation Factor Temperature Test Method
0.01200 22°C ASTM D150, 1 KHz
Volume Resistivity Test Methods
Volume Resistivity Temp (°C) Test Method
1.5e15 (ohms-cm) 23°C ASTM D257
Modulus Test Methods
Modulus Temperature
344,000 psi Cured
Shore D Hardness Test Methods
Shore D Hardness Shore Hardness Test Method
82 ASTM D2240, Temp F: 73F
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 Mid-point, Notes: Glass Transition Temperature (Tg) determined using DSC Analyzer with a heating rate of 68°F (20°C) per minute. Second heat values given.