• Description for 3M 2290

    21% solids liquid epoxy • B-stageable • Laminating steel cores for motor stators and rotors • Thin metal stack laminations

    *See Terms of Use Below

    Application Type Bonding, Coating
    1 Part or 2 Part 1 Part
    Material Form Liquid
    Substrate Aluminum, Copper, Glass, Metal, Plastic, Rubber, Steel, 2024 T-3 clad aluminum, Copper foil
    Industry Coil, Core, Motor, Electronic Subassemblies, Motor Stator, Stack, Rotor, Printed Circuits
    Manufacturer 3M
    Chemistry Epoxy, Methyl Ethyl Ketone (MEK) Tetrahydrofuran, Epoxy resin
    Cure Method Solvent
    Cure Temperature (°C) 24, 177
    Cure Time (min) 30, 30 to 60
    Viscosity (cPs) 40 to 80
    Color Light Amber
    Aging Resistance Aging resistance
    Chemical Resistance Aromatic Fuels, Hydraulic Oil, Salt spray, Tap Water
    High Temperature Resistance (°C) 149
    Low Temperature Resistance (°C) -55
    Density (g/cm³) 7.2 to 7.6 (weight (lbs/gal))
  • Technical Data for 3M 2290

    Overview
    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 1 Part
    • Material Form
      • Liquid
    • Substrate
    • Industry
      • Electronics - Core, Electronic Subassemblies, Printed Circuits, Rotor, Stack
      • Coils - Coil
      • Industrial - Laminated Steel Cores
      • Motors - Motor, Motor Stator
    • Chemistry
      • Epoxy - Epoxy resin
      • Other - Methyl Ethyl Ketone (MEK) Tetrahydrofuran
    • Cure Method
      • Solvent
    • Color
      • Red - Light Amber
    Specifications
    Cure Specs
    Cure Temperature (°C) 24, 177
    Cure Time (min) 30, 30 to 60
    Viscosity (cPs) 40 to 80
    Bond Strength
    Structural/Load-Bearing Structural
    Peel Strength (piw) High, 10 (lbs/inch width) Test Method
    Shear Strength (psi) High, 5,000, 5,000, 3,500, 1,200, 300 Test Method
    Material Resistance
    Aging Resistance Aging resistance
    Chemical Resistance Aromatic Fuels, Hydraulic Oil, Salt spray, Tap Water
    High Temperature Resistance (°C) 149
    Low Temperature Resistance (°C) -55
    Conductivity
    Dissipation Factor 0.01100 Test Method
    Dielectric Strength (V/mil) 2,400
    Dielectric Constant 5.20 Test Method
    Volume Resistivity (O) 1.2e15 (ohms/cm) Test Method
    Other Properties
    Glass Transition Temp (Tg) (°C) 95
    Coefficient of Thermal Expansion (CTE) 262e-6 (in./in./°C), 543e-6 (in./ in/°C) Test Method
    Flash Point (°F) 6.8
    % Solids (%) 20 to 23 Test Method
    Density (g/cm³) 7.2 to 7.6 (weight (lbs/gal))
    Business Information
    Shelf Life Details Store products at 60-80°F (15-27°C) for maximum storage life. 3M™Scotch-Weld™ Epoxy Adhesive/Coating 2290 will have a shelf life of 15 months in unopened containers. Rotate stock on a “first in-first-out” basis.
    Shelf Life Temperature (°F) 59 to 81
    Shelf Life Type Date of shipment
    Shelf Life (mon) 15
  • Best Practices for 3M 2290

    *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 depends on the required bond strength and the environmental aging resistance desired by user.

      See Vendor Technical Data Sheet for more info.

    2. Application

      3M Scotch-Weld™Epoxy/Adhesive Coating 2290 can be applied by brushing, flow coating, dip coating, roll coating, knife coating and spraying. For spray application, use a DeVilbiss JGA-70-FX spray gun or equivalent applicator. The atomizing air should be approximately 30 psi. Apply the adhesive at a dry film thickness of 1 mil if coating only one surface. If coating two surfaces, apply a 0.5 mil dry film to each surface. For film thickness less than 1 mil, it may be necessary to dilute Scotch-Weld 2290. For dilution, a 4 parts by weight methyl ethyl ketone to 1 part by weight tetradhydrofuran solution should be made. (A dilution of 1 part of this solution to 1 part of Scotch-Weld 2290 will give a dried film thickness of approximately 0.5 mil). Coverage per 1 mil dry film thickness is approximately 300 sq. ft./gal.

    3. Curing

      Curing is accomplished with heat. Scotch-Weld 2290 must reach a minimum of 335°F (168°C) for curing to be initiated. A curing temperature of 350°F (177°C) for 30-60 minutes under a pressure of 75 psi is suggested for optimum results. Allow time for the bond lines to reach the cure temperature before timing the cycle. With experimentation and evaluation by the user, lower pressure and/or higher temperature cures for shorter times can be used to make satisfactory bonds depending upon the end use requirements of each individual application.

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Shear Strength Test Methods
Shear Strength Type Substrate Test Temperature Test Method
High
5,000 psi Overlap shear strength 2024 T-3 clad aluminum. -55°C Tests were conducted in accordance with ASTM D-1002 methods. Properties were measured on 1" wide x 1/2" overlap specimens cut from 0.063" thick 4" x 7" bonded panels of 2024 T-3 clad aluminum. The aluminum surface was cleaned using the procedure described in the "Surface Preparation" section.
5,000 psi Overlap shear strength 2024 T-3 clad aluminum. 24°C Tests were conducted in accordance with ASTM D-1002 methods. Properties were measured on 1" wide x 1/2" overlap specimens cut from 0.063" thick 4" x 7" bonded panels of 2024 T-3 clad aluminum. The aluminum surface was cleaned using the procedure described in the "Surface Preparation" section.
3,500 psi Overlap shear strength 2024 T-3 clad aluminum. 82°C Tests were conducted in accordance with ASTM D-1002 methods. Properties were measured on 1" wide x 1/2" overlap specimens cut from 0.063" thick 4" x 7" bonded panels of 2024 T-3 clad aluminum. The aluminum surface was cleaned using the procedure described in the "Surface Preparation" section.
1,200 psi Overlap shear strength 2024 T-3 clad aluminum. 121°C Tests were conducted in accordance with ASTM D-1002 methods. Properties were measured on 1" wide x 1/2" overlap specimens cut from 0.063" thick 4" x 7" bonded panels of 2024 T-3 clad aluminum. The aluminum surface was cleaned using the procedure described in the "Surface Preparation" section.
300 psi Overlap shear strength 2024 T-3 clad aluminum. 149°C Tests were conducted in accordance with ASTM D-1002 methods. Properties were measured on 1" wide x 1/2" overlap specimens cut from 0.063" thick 4" x 7" bonded panels of 2024 T-3 clad aluminum. The aluminum surface was cleaned using the procedure described in the "Surface Preparation" section.
Peel Strength Test Methods
Peel Strength Substrate Test Temperature Test Method
High
10 (lbs/inch width) 2024 T-3 clad, 24°C Tests were performed per ASTM D-1876. Test samples were 1" wide, 2024 T-3 clad, .032" thick aluminum. The aluminum surface was cleaned using the procedure described in the “Surface Preparation” section.
Dielectric Constant Test Methods
Dielectric Constant Temperature Test Method
5.20 23°C Dielectric constant, 1 Kz
Dissipation Factor Test Methods
Dissipation Factor Temperature Test Method
0.01100 23°C Dissipation Factor, 1 Kz
Volume Resistivity Test Methods
Volume Resistivity Temp (°C)
1.2e15 (ohms/cm) 23°C
Coefficient of Thermal Expansion (CTE) Test Methods
Coefficient of Thermal Expansion (CTE) CTE Temperature (°C)
262e-6 (in./in./°C) -20 to 70°C
543e-6 (in./ in/°C) 100 to 120°C
% Solids Test Methods
% Solids Test Method
20 to 23 % By weight