Bostik Automotive


Bostik 70-08A AP is a high quality product based on Silyl Modified Polymer (SMP), especially developed for bonding windscreens. This is a great, primerless automotive windshield adhesive

    Where to use:
  • Windshield Bonding
Pillar Technology

Elastic Bonding (EB)


Reactive One Component (R1K)


Silane Modified Polymer

Key Features

  • High green strength
  • Primerless adhesion
  • Passes FMVSS 212 requirements for glass glazing

Key Benefits

  • Adheres well without primer on glass and no UV blocking primer is needed when the glass-adhesive interface is UV-protected by a ceramic coating.
  • Solvent-, isocyanate- and PVC free.
  • Very good UV-resistance and aging properties.
  • Generally good adhesion on several substrates without the use of a primer.
  • Permanent elastic within temperatures from -40°F to 248°F (-40°C to 120°C).
  • Neutral and odorless curing.
  • Low volume shrinkage.
  • Low electrical conductivity.


For packaging options please call your Bostik sales or technical representative.

Shelf Life

Bostik 70-08A AP may be stored in a closed (unopened) container in a dry place at temperatures between 41°F to 86°F (5°C to 30°C) for 9-18 months depending on package size.

Health and Safety Precautions

The Safety Data Sheet should be consulted for proper handling, clean up and spill containment before use. Keep containers covered to minimize contamination.

Country of Manufacture

United States

Basic Uses

70-08A AP can easily be extruded with a hand or air pressure gun at temperatures between 41°F and 95°F (5°C and 35°C). The speed of application can be improved by heating up to 158°F (70°C) maximum. For good adhesion, a clean, dry and grease free surface is necessary. Cleaning of the ceramic coated layer as well as many closed surfaces, like aluminum, coated steel, polyester (GRP) can be done with Bostik Cleaner I. In those cases where due, to great thermal or physical loads and especially under wet conditions, high adhesion demands are needed, the use of Bostik Prep M is recommended. Prep M degreases and prepares the surface of the substrate in one step. For more details concerning Prep M consult the specific Technical Data Sheet. Within a few minutes after pretreating the screen can be bonded. The screen has to be bonded within 15 minutes after applying 70-08A AP. When no ceramic coating is available or the ceramic coating doesn’t supply sufficient UV-protection, Bostik Prep G is needed after the screen has been cleaned with Bostik Cleaner 14 or Cleaner I, unless a cover shields the glass-adhesive interface from UV-radiation. Cleaning tools or removing uncured residue of 70-08A AP can be done with a clean colorless cloth, wetted with Bostik Liquid 1. It is recommended to make a trial first to check possible attack of the substrate by these cleaners.

Typical Physical Properties
Basic materialSilyl Modified Polymer (SMP)
Curing methodMoisture
Specific gravityca. 1.5g/ml
Skin forming timeca. 15 min.
Open time< 15 min.
Curing speed after 24 hrsca. 3 mm
Shore A hardnessca. 60
Volume change< 3%
Electrical volume resistivity> 10^11 ohm cm
Tensile stress (100%)ca. 2.3 MPa
Tensile stress at breakca. 2.9 MPa
Elongation at breakca. 250%
Shear stressca. 2.4 MPa (Alu-Alu; adh. thickness 2mm, test speed 50 mm/min.)
Tear propagationca. 16N/mm (Type C, test speed 500mm/min.)
E-Modulus (10%)ca. 5.5 MPa
Solvent percentage0%
Isocyanate percentage0%
Temperature resistance-40°F to 248°F (-40°C to 120°C)
Temperature resistance356°F (180°C) - max. 30 min.
Application temperature41°F to 95°F (5°C to 35°C)
UV and weather resistanceVery good
Colors (standard)Black
Packaging9.8oz Cartridge, 13.5oz Sausage, 20oz Sausage, 5 Gal Pail, 52 Gal Drum

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