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Description for 3M 1838L B/A
Long worklife rigid epoxy • Low viscosity version of 1838Chemical 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 Metals, Some Plastics, Rubbers, Cold rolled Steel, Woods, Stainless steel, Epoxy, 2024 T3 clad aluminum, Steel Manufacturer 3M Chemistry Epoxy Cure Method Base/Accelerator Cure Temperature (°C) 20 to 25, 24, 66, 93 Cure Time (min) 10,080, 120, 30 Viscosity (cPs) 10,000, Low, Flowable Color Amber, Clear, Translucent High Temperature Resistance (°C) 82 Low Temperature Resistance (°C) -55 Volume Resistivity (O) 5.0e12 (ohms/cm) Key Specifications Mil-Spec (United States Military Standard): Mil-0-5606 -
Technical Data for 3M 1838L B/A
Overview
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Chemical Resistance
- Chemical Resistance : Fluid Resistance : Water Resistance - Tap Water
- Chemical Resistance - Hydraulic Oil, White Gas
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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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Chemistry
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Cure Method
- 2-Part Cure - Base/Accelerator
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Color
- Translucent
- Clear / Transparent - Clear
- Red - Amber
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Key Specifications
- Mil-Spec (United States Military Standard) : 5606 - Mil-0-5606
Specifications
Cure Specs
Cure Temperature (°C) 20 to 25, 24, 66, 93 Cure Time (min) 10,080, 120, 30 Viscosity (cPs) 10,000, Low, Flowable Test Method Fixture or Handling Strength Time (min) 360 to 600, 15 to 20 Test Method Work / Pot Time (min) 60, Long Test Method Mix Ratio 1:1 (by volume), 6:5 (by weight) Bond Strength
Structural/Load-Bearing Structural General Bond Strength (psi) Excellent Peel Strength (piw) 5, 4, 4 Test Method Shear Strength (psi) High, 2,000, 2,500, 300, 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 Material Resistance
Environmental Resistance Excellent High Temperature Resistance (°C) 82 Low Temperature Resistance (°C) -55 Moisture/Humidity Resistance Moisture/humidity resistance Conductivity
Dissipation Factor 0.08800 Test Method Dielectric Strength (V/mil) 600 Test Method Dielectric Constant 6.10 Test Method Thermal Conductivity (W/m°K) 0.20 Test Method Volume Resistivity (O) 5.0e12 (ohms/cm) Test Method Hardness
Shore D Hardness 80 to 85 Test Method Elongation (%) 3 to 7 Test Method Flexibility Rigid Other Properties
Glass Transition Temp (Tg) (°C) 32 Test Method Coefficient of Thermal Expansion (CTE) 301e-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 2 years from date of shipment 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 shipment Shelf Life (mon) 24 -
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Best Practices for 3M 1838L B/A
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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.
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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.
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.
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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.
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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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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 |
Viscosity Test Methods
Viscosity | Temperature |
---|---|
10,000 cPs | 27°C |
Low | |
Flowable |
Work / Pot Time Test Methods
Work / Pot Time | Test Method | Temperature |
---|---|---|
60 min | Uncured, Mixed 100 (gms) | 23°C |
Long |
Peel Strength Test Methods
Peel Strength | Type | Substrate | Test Temperature | Test Method |
---|---|---|---|---|
5 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 |
Shear Strength Test Methods
Shear Strength | Type | Substrate | Chemical | Test Temperature | Test Humidity | Test Method |
---|---|---|---|---|---|---|
High | ||||||
2,000 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. | ||
2,500 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. | ||
300 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 | 24°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). | |
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). | |
3,600 psi | Overlap shear strength | Stainless 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). | |
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). | |
2,900 psi | Overlap shear strength | Aluminum | Hydraulic Oil | 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 |
---|---|---|
6.10 | 24°C | Cured, 1 KHz |
Dielectric Strength Test Methods
Dielectric Strength | Test Method |
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600 V/mil | Cured |
Dissipation Factor Test Methods
Dissipation Factor | Temperature | Test Method |
---|---|---|
0.08800 | 75°C | Cured, 1 KHz |
Thermal Conductivity Test Methods
Thermal Conductivity | Test Method |
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0.20 W/m°K | Cured |
Volume Resistivity Test Methods
Volume Resistivity | Temp (°C) |
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5.0e12 (ohms/cm) | 24°C |
Elongation Test Methods
Elongation | Test Method |
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3 to 7 % | Cured, Approx. |
Shore D Hardness Test Methods
Shore D Hardness | Shore Hardness Test Method |
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80 to 85 | Cured, Approx. |
Coefficient of Thermal Expansion (CTE) Test Methods
Coefficient of Thermal Expansion (CTE) | CTE Temperature (°C) | CTE Test Method |
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301e-6 (in./ in/°C) | 20 to 84°C | Cured |
Glass Transition Temp (Tg) Test Methods
Glass Transition Temp (Tg) | Glass Transition Temperature (Tg) Test Method |
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32°C | Cured |