• 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
    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

    Overview
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    Specifications
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  • Best Practices

    *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
-0.4°F TCC