• Description for 3M 08690

    A one-part moisture curing urethane providing rapid strength build-up. 3M™ Fast Cure Auto Glass Urethane (High Viscosity) is a high strength adhesive designed for use in full cut-out installations without damming materials.

    *See Terms of Use Below

    Application Type Adhesive
    1 Part or 2 Part 1-Part
    Material Form Paste
    Industry Reinstallation of vehicle windshields, Reinstallation of vehicle backlites, Reinstallation of vehicle sidelites
    Manufacturer 3M
    Chemistry Polyurethane, Urethane
    Cure Method Moisture
    Cure Time (min) Fast, 5.00 to 10
    Viscosity (cPs) High
    Color Black
    Density (g/cm³) 9.8 to 10 (lbs/Gallon) (Appx.)
  • Technical Data for 3M 08690

    • Application Type
    • 1 Part or 2 Part
      • 1-Part
    • Material Form
      • Paste
    • Industry
      • Transportation - Reinstallation of vehicle windshields, Reinstallation of vehicle backlites, Reinstallation of vehicle sidelites
    • Chemistry
    • Cure Method
      • Moisture / Condensation Cure - Moisture
    • Color
      • Black
    Cure Specs
    Cure Time (min) Fast, 5.00 to 10
    Viscosity (cPs) High
    Work / Pot Time (min) 10 to 15 Test Method
    Bond Strength
    General Bond Strength (psi) High
    Shear Strength (psi) 55, 100, 150, 250, 500, >500 Test Method
    Tensile Strength (psi) 1,000
    Shore A Hardness 55 to 60
    Elongation (%) 700
    Flexibility Flexible
    Other Properties
    % Solids (%) >95 Test Method
    Density (g/cm³) 9.8 to 10 (lbs/Gallon) (Appx.)
    Business Information
    Shelf Life Details Store between 40°F - 75°F. Rotate stock on a “first-in - first-out” basis. When stored at the recommended conditions in original, unopened containers, this product has a shelf life of 12 months.
    Shelf Life Temperature (°F) 40 to 75
    Shelf Life (mon) 12
  • Best Practices for 3M 08690

    *See Terms of Use Below

    1. Application

      Remove windshield wiper arms and trim necessary to expose the entire perimeter of glass.

      Clean dirt and debris from around the pinchweld area before cutting out the glass and again after the glass is cut out to minimize contamination.

      Cut into existing urethane around entire perimeter of glass with a utility knife cutting as close to edge of the glass as possible.

      Cut out glass with appropriate removal tools keeping as close to the glass as possible. Remove the glass and repeat Step 2.

      Dry set the glass. Align for uniform fit and adjust setting blocks as needed for best fit. To allow for sufficient bonding of urethane, make sure there is a MINIMUM of 1/4 inch of glass, in addition to the space that will be taken up by any dam material, around the entire perimeter of the glass. Mark location by applying masking tape to windshield and car body. Slit tape at edge of glass. Remove windshield.

      Remove major portion of old urethane adhesive from the pinchweld. Use a razor blade knife or utility knife to prevent scraping the paint off the pinchweld and exposing bare metal. NOTE: On urethane installations, it is recommended that a thin film of the old urethane be left on the pinchweld and fresh urethane bonded to remaining film. When removing butyl tape or unknown material, remove all old material from pinchweld before applying fresh urethane.

      Prime any bare metal scratches with 3M Black Urethane Primer, (P/N 08684, 08686). NOTE: When excessive abrasive cleaning is required, prime pinchweld metal with an OEM recommend automotive paint primer and allow to cure properly. Apply 3M Black Urethane Primer to repaired area and allow to dry for 5-10 minutes.

      Clean inside surface of glass with 3M Glass Cleaner, P/N 08888 taking care to clean surface where the urethane bond will be made.

      Apply a thin film of 3M Primer/Degreaser, (P/N 08683, 08685, or 08691) to match the OEM bond line area of the glass with a clean wipe. Wipe off excess primer while still wet. Allow to dry for approximately 5 minutes.

      Apply 3M Black Urethane Primer (P/N 08684, 08686, or 08692) over the primed bond area of the glass. Allow primer to dry for 5-10 minutes.

      If a foam dam was used in the OEM application it is suggested that foam dam material be replaced with 3M Single Sided Foam Dam Tape.

      Cut tip to desired shape and size to provide a bead height sufficient to give good contact with the windshield around the entire perimeter. A triangular shaped notch will provide the desired bead shape and height. A height of 1/2 to 9/16 inch and a 1/4 - 5/16 inch base is suggested. NOTE: When installing encapsulated glass, apply a bead high enough to assure glass contact before encapsulation contacts the car body and prevents further setting. Back paddling material after setting will not be possible.

      Apply 3M Fast Cure Auto Glass Urethane Windshield Adhesive (High Viscosity) - directly onto the remaining OEM urethane film, behind and contacting the dam material.

      Position the glass by aligning the masking tape on the glass and car body. Press glass in place to assure complete contact with dam material and urethane adhesive.

      Paddle squeeze out around edge of glass if possible.

      Remove masking tape alignment strips.

      Replace moldings, windshield wipers and other trim removed in Step 1.

    2. Clean-Up

      Clean any excess urethane with adhesive cleaner

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    *See Terms of Use Below

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Work / Pot Time Test Methods
Work / Pot Time Test Method Temperature
10 to 15 min 75ºF/50% R.H. 24°C
Shear Strength Test Methods
Shear Strength Type Cure Humidity Test Time Test Temperature Test Method
55 psi Overlap shear strength 50 % 7,200 sec 21°C SAE J1529
100 psi Overlap shear strength 50 % 14,400 sec 21°C SAE J1529
150 psi Overlap shear strength 50 % 18,000 sec 21°C SAE J1529
250 psi Overlap shear strength 50 % 32,400 sec 21°C SAE J1529
500 psi Overlap shear strength 50 % 86,400 sec 21°C SAE J1529
>500 psi Overlap shear strength 50 % 172,800 sec 21°C SAE J1529
% Solids Test Methods
% Solids Test Method
>95 % Appx.