• Description for 3M 1945 B/A

    Chemically curing, corrosion resistant primer to improve adhesion of urethanes and epoxies to many metals. Increases corrosion protection. Cures at room temperature.

    *See Terms of Use Below

    Application Type Primer
    1 Part or 2 Part 2 Part
    Material Form Liquid
    Substrate Metal, Urethanes
    Manufacturer 3M
    Chemistry Amine cured epoxy in a blended ketone solvent
    Cure Method Base/Accelerator
    Cure Temperature (°C) 20 to 25, 21 to 27, 21 to 27, 21 to 27, 82, 121
    Cure Time (min) >60, 1,440, 60, 30, 5.00
    Color Green
    Density (g/cm³) 10.6 to 11.1 (weight (lbs/gal)), 6.8 to 7.2 (weight (lbs/gal))
    Can Be Used In Conjunction With These Materials Urethanes, Epoxies
  • Technical Data for 3M 1945 B/A

    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 2 Part
      • Part A Name - Base
      • Part B Name - Accelerator
    • Material Form
      • Liquid
    • Substrate
    • Chemistry
      • Epoxy - Amine cured epoxy in a blended ketone solvent
    • Application Method
      • Brush - Brushing
      • Spray - Spraying
      • Dip - Dipping
    • Cure Method
      • 2-Part Cure - Base/Accelerator
    • Color
      • Green
    • Can Be Used In Conjunction With These Materials
      • Epoxies
      • Urethanes
    Cure Specs
    Cure Temperature (°C) 20 to 25, 21 to 27, 21 to 27, 21 to 27, 82, 121
    Cure Time (min) >60, 1,440, 60, 30, 5.00
    Work / Pot Time (min) <480 Test Method
    Mix Ratio 1:1 (by volume)
    Bond Strength
    Structural/Load-Bearing Structural
    Material Resistance
    Non-Corrosive Corrosion protection
    Other Properties
    % Solids (%) 61 to 65, 4.6 to 2.4 Test Method
    Density (g/cm³) 10.6 to 11.1 (weight (lbs/gal)), 6.8 to 7.2 (weight (lbs/gal))
    Business Information
    Shelf Life Details Storage: Store product at 80°F or less for maximum shelf life. Rotate stock so that the oldest shipments are always used first.;Shelf Life: Standard shelf life for 3M™ Scotch-Weld™ Structural Adhesive Primer EC-1945 B/A is 12 months from date of shipment when stored at 80°F or lower.
    Shelf Life Temperature (°F) <80
    Shelf Life Type from date of shipment
    Shelf Life (mon) 12
  • Best Practices for 3M 1945 B/A

    *See Terms of Use Below

    1. Surface Preparation

      Substrates must be clean, dry and free of oil, grease, release agents or other contaminants. Substrates such as aluminum can be cleaned satisfactorily using clean dry rags or unsized, lint-free cheese cloth that has been soaked in common cleaners* such as called out in MIL-C-38736.

    2. Application

      3M™ Scotch-Weld™ Structural Adhesive Primer EC-1945 B/A can be applied by dipping, brushing or spraying. For optimum results, Scotch-Weld Primer EC-1945 B/A should be applied to a dry film thickness of 0.2-0.7 mils (0.0002-0.0007 inches).

    3. Mixing

      Thoroughly mix the base and accelerator at a one to one (1:1) volume ratio. Scotch-Weld Primer EC-1945 B/A, at 77 ± 2°F in a sealed container, has an application life of approximately 8 hours. (Periodic agitation is necessary.)

    4. Curing

      Scotch-Weld Primer EC-1945 B/A is an amine cured epoxy in a blended ketone solvent. The primer must contain no solvent prior to the application of the adhesive or sealer. A minimum of 60 minutes @ 75° ± 5°F is the suggested drying time prior to adhesive or sealer application. Higher temperatures will reduce this drying time and the following is the suggested cure cycles. (a) 24 hours @ 75° ± 5°F (b) 1 hour @ 75° ± 5°F followed by 30 minutes @ 180°F or 5 min. @ 250°F.

      Note: Cure cycle (b) is the suggested cure to provide maximum toughness and corrosion protection of the primer.

    5. Clean-Up

      All containers, tools and equipment normally re-used in handling this product should be cleaned before the product has an opportunity to set up or cure. This can be done easily with conventional organic solvents such as methyl ethyl ketone.* Cured Scotch-Weld Primer EC-1945 B/A can be removed by soaking in a methylene chloride type stripper.*

      *Note: When using solvents, be sure to follow the manufacturer’s precautions and directions for use for handling such materials.

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    *See Terms of Use Below

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Work / Pot Time Test Methods
Work / Pot Time Test Method Temperature
<480 min In a sealed container (Periodic agitation is necessary) 24 to 26°C
% Solids Test Methods
% Solids Test Method
61 to 65 % By weight
4.6 to 2.4 % By weight