• Description for 3M 4491

    • Low viscosity grade for spray application. • Fast drying. • Provides strong, flexible bonds.

    *See Terms of Use Below

    Application Type Bond
    1 Part or 2 Part 1 Part
    Material Form Liquid, Synthetic Elastomer
    Substrate Aluminum, Fabrics, Many plastics, Steel, Porous Surface, Non-Porous Surface, Stain light colored vinyls, Foams
    Manufacturer 3M
    Chemistry Synthetic Elastomer, Acetone, Cyclohexanone
    Cure Method Heat
    Cure Temperature (°C) 93, 116, 138, 160, 182, 204
    Cure Time (min) Fast, 120, 40, 12, 8, 5.00, 2.00
    Viscosity (cPs) Low, 200 to 325
    Color Light Tan
    Chemical Resistance Water, Fuels, Oil, Plasticizers
    High Temperature Resistance (°C) 121
    Low Temperature Resistance (°C) -55
    Density (g/cm³) approx. 7.0 - 7.4 (lbs./gal.)
  • Technical Data for 3M 4491

    Overview
    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 1 Part
    • Material Form
      • Elastomer - Synthetic Elastomer
      • Liquid
    • Substrate
      • Porous Substrates - Porous Surface
      • Non-Porous Substrates - Non-Porous Surface
      • Foam - Foams
      • Aluminum
      • Steel
      • Plastic - Many plastics
      • Vinyl - Stain light colored vinyls
      • Fabric - Fabrics
      • Other - Leather, Canvas
    • Industry
      • Industrial
      • Other - vinyl extrusions and sheeting (May stain light colored vinyls)
    • Chemistry
      • Other - Synthetic Elastomer, Acetone, Cyclohexanone
    • Application Method
      • Brush
      • Spray
      • Flow
    • Cure Method
      • Heat
    • Color
      • Brown - Light Tan
    Specifications
    Cure Specs
    Application Temperature (°F) >64
    Cure Temperature (°C) 93, 116, 138, 160, 182, 204
    Cure Time (min) Fast, 120, 40, 12, 8, 5.00, 2.00
    Viscosity (cPs) Low, 200 to 325 Test Method
    Bond Strength
    General Bond Strength (psi) Strong
    Peel Strength (piw) 16.5 (lbs./in.), 26 (lbs./in.), 23.5 (lbs./in.), 27.5 (lbs./in.), 31 (lbs./in.), 30 (lbs./in.), 17.5 (lbs./in.), 7 (lbs./in.), 3.5 (lbs./in.) Test Method
    Shear Strength (psi) 2,989, 3,409, 1,306, 897, 643, 607, 467 Test Method
    Material Resistance
    Chemical Resistance Water, Fuels, Oil, Plasticizers
    Environmental Resistance Weather
    High Temperature Resistance (°C) 121
    Low Temperature Resistance (°C) -55
    Hardness
    Flexibility Flexible
    Other Properties
    Flash Point (°F) -0.4 Test Method
    % Solids (%) 22 to 26
    Density (g/cm³) approx. 7.0 - 7.4 (lbs./gal.)
    Business Information
    Shelf Life Details Store product at 60-80°F (16-27°C) for maximum storage life. Higher temperatures can reduce normal storage life. Lower temperatures can cause increased viscosity of a temporary nature. Rotate stock on a “first in-first out” basis.;When stored at the recommended conditions in the original, unopened container this product has a shelf life of 15 months from date of shipment.
    Shelf Life Temperature (°F) 61 to 81
    Shelf Life Type From date of shipment
    Shelf Life (mon) 15
    Not Good For
    Don't Use With Polyolefin plastic
  • Best Practices for 3M 4491

    *See Terms of Use Below

    1. Surface Preparation

      Remove all dust, dirt, oil, grease, wax, loose paint, etc. Wiping with methyl ethyl ketone (MEK)* or 3M™ Citrus Base Cleaner* will aid in preparing the surface for bonding.

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

    2. Application

      Stir well before using.

      Porous Surface(s): Brush, flow or spray a thin, even coat of adhesive to one or both surfaces. Coating both surfaces is preferred since it gives greater strength and permits longer open time before bonding. Very absorbent materials may require more than one coat. Bond while adhesive is still wet or aggressively tacky. Join surfaces with firm pressure.

      Non-Porous Surface(s): Brush, flow or spray a thin, even coat of adhesive to both surfaces. Allow adhesive to dry until tacky. Join surfaces with firm pressure.

    3. Curing

      Drying time depends on temperature, humidity, air movement, and porosity of the materials bonded. Greater immediate strength may be obtained by heat or solvent reactivation.

    4. Clean-Up

      Excess adhesive may be removed with acetone preferably while adhesive is still wet.

  • Comparable Materials for 3M 4491

    *See Terms of Use Below

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Viscosity Test Methods
Viscosity Test Method Temperature
Low
200 to 325 cPs Brookfield RVF @ 77°F (25°C), (#2 sp @ 20 rpm) 25°C
Peel Strength Test Methods
Peel Strength Type Cure Time Cure Temperature Substrate Test Temperature Test Method
16.5 (lbs./in.) 180° Peel Strength 1,440 min 24°C Canvas/Steel 24°C Width
26 (lbs./in.) 180° Peel Strength 4,320 min 24°C Canvas/Steel 24°C Width
23.5 (lbs./in.) 180° Peel Strength 7,200 min 24°C Canvas/Steel 24°C Width
27.5 (lbs./in.) 180° Peel Strength 10,080 min 24°C Canvas/Steel 24°C Width
31 (lbs./in.) 180° Peel Strength 20,160 min 24°C Canvas/Steel 24°C Width
30 (lbs./in.) 180° Peel Strength 30,240 min 24°C Canvas/Steel 24°C Width
17.5 (lbs./in.) 180° Peel Strength 30,240 min 24°C Canvas/Steel -34°C Width
7 (lbs./in.) 180° Peel Strength 30,240 min 24°C Canvas/Steel 66°C Width
3.5 (lbs./in.) 180° Peel Strength 30,240 min 24°C Canvas/Steel 82°C Width
Shear Strength Test Methods
Shear Strength Type Cure Time Cure Temperature Substrate Test Temperature Test Method
2,989 psi Overlap shear Strength 30 min 177°C Alum./Alum. -55°C Bonds heat cured @ 300°F (177°C) for 30 minutes with 100 psi pressure on the bondline.
3,409 psi Overlap shear Strength 30 min 177°C Alum./Alum. -34°C Bonds heat cured @ 300°F (177°C) for 30 minutes with 100 psi pressure on the bondline.
1,306 psi Overlap shear Strength 30 min 177°C Alum./Alum. 24°C Bonds heat cured @ 300°F (177°C) for 30 minutes with 100 psi pressure on the bondline.
897 psi Overlap shear Strength 30 min 177°C Alum./Alum. 66°C Bonds heat cured @ 300°F (177°C) for 30 minutes with 100 psi pressure on the bondline.
643 psi Overlap shear Strength 30 min 177°C Alum./Alum. 82°C Bonds heat cured @ 300°F (177°C) for 30 minutes with 100 psi pressure on the bondline.
607 psi Overlap shear Strength 30 min 177°C Alum./Alum. 93°C Bonds heat cured @ 300°F (177°C) for 30 minutes with 100 psi pressure on the bondline.
467 psi Overlap shear Strength 30 min 177°C Alum./Alum. 121°C Bonds heat cured @ 300°F (177°C) for 30 minutes with 100 psi pressure on the bondline.
Flash Point Test Methods
Flash Point Test Method
-18.0°C TCC