• Description for 3M 3901

    A primer for film and liquid adhesives for improved metal and glass adhesion or improved resistance to environmental exposure with epoxy and urethane adhesives. Protects cleaned surfaces until bonding can be completed. Imparts improved corrosion protection to metal.

    *See Terms of Use Below

    Application Type Prime
    1 Part or 2 Part 1-Part
    Material Form Liquid
    Substrate Glass, Metal
    Manufacturer 3M
    Chemistry Methyl alcohol
    Cure Method Solvent, Air dry
    Viscosity (cPs) 3.00 to 7
    Color Red
    Density (g/cm³) 6.3 to 6.7 (weight (lbs/gal))
    Can Be Used In Conjunction With These Materials Epoxy, Urethane
  • Technical Data for 3M 3901

    • Application Type
    • 1 Part or 2 Part
      • 1-Part
    • Material Form
      • Liquid
    • Substrate
    • Industry
      • Other - for Scotch-Weld film and liquid adhesives
    • Chemistry
    • Application Method
      • Brush - Brushing
      • Spray - Spraying
    • Cure Method
      • Room Temperature / Air Dry - Air dry
      • Solvent
    • Color
      • Red
    • Can Be Used In Conjunction With These Materials
      • Epoxies - Epoxy
      • Urethanes - Urethane
    Cure Specs
    Viscosity (cPs) 3.00 to 7 Test Method
    Bond Strength
    Structural/Load-Bearing Structural
    Material Resistance
    Environmental Resistance Environmental resistance
    Other Properties
    Flash Point (°F) 60.8
    Density (g/cm³) 6.3 to 6.7 (weight (lbs/gal))
    Business Information
    Shelf Life Details Storage: Store product at 60-80°F (16-27°C) for maximum storage life. Higher temperatures reduce normal storage life.;Shelf life: This product has a shelf life of 15 months from the date of shipment when stored in the unopened original container at room temperature.
    Shelf Life Temperature (°F) 77
    Shelf Life Type From Date of shipment
    Shelf Life (mon) 15
  • Best Practices for 3M 3901

    *See Terms of Use Below

    1. Surface Preparation

      A thoroughly cleaned, dry, grease-free surface is essential for maximum performance. Cleaning methods which will produce a break-free water film on metal surfaces are generally satisfactory. Surface preparations should be fully evaluated with the adhesive, especially if resistance to specific environments are anticipated.

    2. Curing

      Air dry cycles for periods as short as 1/2 hour have been used successfully with the force dry cycle. Humidity contributes greatly to satisfactory use of this primer. Relative humidity of 25% or lower may cause difficulties and should be thoroughly evaluated in the customer’s application.

      The primed surface, after cooling to ambient temperatures, is ready for adhesive bonding.

    3. Clean-Up

      Excess primer and equipment may be cleaned up with ketone-type solvents. *

      *Note: When using solvents, extinguish all ignition sources, and follow the manufacturer’s precautions and directions for use.

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    *See Terms of Use Below

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Viscosity Test Methods
Viscosity Test Method Temperature
3.00 to 7 cPs Brookfield, RVF, No. 1 spindle, 20 rpm at 80°F [27°C] 27°C