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Description for 3M 2290
21% solids liquid epoxy • B-stageable • Laminating steel cores for motor stators and rotors • Thin metal stack laminationsChemical Resistance Aromatic Fuels, Chemical Resistance: Fluid Resistance: Tap Water, Hydraulic Oil, Salt spray 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 Core, Coil, 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 High Temperature Resistance (°C) 149 Low Temperature Resistance (°C) -55 Volume Resistivity (O) 1.2e15 (ohms/cm) Density (g/cm³) 7.2 to 7.6 (weight (lbs/gal)) -
Technical Data for 3M 2290
Overview
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Chemical Resistance
- Chemical Resistance : Fluid Resistance : Water Resistance - Tap Water
- Chemical Resistance - Aromatic Fuels, Hydraulic Oil, Salt spray
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1 Part or 2 Part
- 1-Part
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Material Form
- Liquid
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Industry
- Electronics - Core, Electronic Subassemblies, Printed Circuits, Rotor, Stack
- Coils - Coil
- Industrial - Laminated Steel Cores
- Motors - Motor, Motor Stator
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Chemistry
- Epoxy - Epoxy resin
- Other - Methyl Ethyl Ketone (MEK) Tetrahydrofuran
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Cure Method
- Solvent
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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 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 -
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Best Practices for 3M 2290
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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 depends on the required bond strength and the environmental aging resistance desired by user.
See Vendor Technical Data Sheet for more info.
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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.
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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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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. |
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. |
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 |
