81AF Modified Bitumen Adhesive

Karnak #81AF Modified Bitumen Adhesive is a COLD APPLIED, HIGH STRENGTH SBS POLYMER MODIFIED ASPHALT ADHESIVE, that provides excellent adhesion and elongation properties. Karnak #81AF Modified Bitumen is available in a brush and trowel grades.


Karnak #81AF Brush-Grade is used to adhere SBS modified bitumen membranes, base and ply sheets. Karnak #81AF Modified Bitumen Adheisve can also be utilized to adhere conventional BUR ply sheets or fully granulated cap sheets.

Karnak #81AF Trowel-Grade can be used to make repairs on existing modified applications and flashings on vertical surfaces, i.e. skylights, vents and pipes.


  • ASTM D-3019 Type III


All surfaces should be free from oil, grease, dirt and loose materials. All BUR surfaces should be patched and repaired with Karnak 19 ULTRA Rubberized Flashing Cement and Karnak #31 Glass Membrane. Metal surfaces must have all rust and scales removed.


  • UL approved.
  • Excellent cure.
  • Tough, flexible, adhesive and cohesive film.
  • Excellent water and weather resistance.
  • Excellent general adhesive.
  • Excellent lap cement.
  • Good U.V. resistance.
  • Easy to apply.
  • Elastomeric, moves with substrate.


Apply Karnak #81AF Modified Bitumen Adhesive at the rate of approximately 1 gallon per 100 square feet on horizontal and vertical surfaces; irregular surfaces may require slightly more material. Karnak #81AF Modified Bitumen Adhesive may be applied by squeegee, roller, brush or trowel.


Apply Karnak #81AF Modified Bitumen Adhesive at the rate of 1 gallon per 100 sq. ft.. On porous or irregular surfaces, 2 gallons per 100 sq. ft. may be required.


  • Weight per Gallon: 8.65
  • Shear Strength: 26 lbs./ sq. in.
  • Peel Strength: 13 lbs./ lin. in.
  • Elongation: 250%
  • Recovery: 95%
  • Cure Time: 24 to 48 hours
  • Application Temperatures: 40°F to 100°F


Equipment may be thoroughly cleaned after use with mineral sprits, taking necessary precaution when handling combustible materials.


Do not use near open flame. Avoid breathing solvent fumes and prolonged contact with skin. Excessive application may create blistering. Application below 40Æ’F may take longer to cure. Do not take internally. If swallowed, do not induce vomiting. Call a physician immediately. Keep out of reach of children. Keep container covered when not in use. Do not thin. Dispose of in an environmentally safe manner. Cover air intakes during application and while drying.


Available in 5 gallon pails.

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