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
- Adhesive - Adhesive
1 Part or 2 Part
- 1 Part or 2 Part - 1 Part
- Transportation - Reinstallation of vehicle windshields, Reinstallation of vehicle backlites, Reinstallation of vehicle sidelites
- Polyurethane - Urethane
- Moisture / Condensation Cure - Moisture
Cure Time (min) Fast, 5.00 to 10 Viscosity (cPs) High Work / Pot Time (min) 10 to 15 Test Method
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
% Solids (%) >95 Test Method Density (g/cm³) 9.8 to 10 (lbs/Gallon) (Appx.)
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
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.
Clean any excess urethane with adhesive cleaner
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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|