Instructions / Assembly

330 Central Ave. I Clark, NJ 07066 I 800.526.4236 I Fax [phone] | www.karnakcorp.com
Updated: 05.04.20
ROOFING
66 Modified Bitumen Adhesive
*Read Safety Data Sheet before using this product.*
DESCRIPTION: 66 Modified Bitumen Adhesive is a bituminous based adhesive sealant designed for the
application and repair of SBS modified bitumen single-ply membranes and bituminous single-ply
membranes. When properly utilized this product adheres the membrane and seals the laps to prevent
water intrusion.
USES: 66 Modified Bitumen Adhesive Brush-Grade is used to adhere and repair SBS modified bitumen
single-ply membranes, base and ply sheets, and bituminous single-ply membranes. 66 Modified Bitumen
Adhesive Trowel-Grade can be used to seal and make repairs on existing modified applications and
flashings on vertical surfaces, i.e. skylights, vents and pipes.
FEATURES, BENEFITS & ADVANTAGES:
 Easy to apply.
 Eliminates the need for torches and kettles.
 Excellent cure.
 Tough, flexible, adhesive and cohesive
film
 Excellent water and weather resistance.
 Excellent general adhesive sealant.
 Excellent lap cement.
 Good U.V. resistance.
 Complies with current VOC regulations.
 Elastomeric, moves with substrate.
SURFACE PREPARATIONS: 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. Recommended
application temperature is 40°F to 120°F. If applying at temperatures lower than 40°F, the substrate must
be free of moisture and/or ice crystals.
APPLICATION: Apply 66 Modified Bitumen Adhesive Brush Grade on Horizontal surfaces at a rate of
approximately 1-2 gallons per 100 square feet; irregular surfaces may require slightly more material. Do
not apply adhesive directly to decking or sheathing. On Vertical surfaces apply 66 Modified Bitumen
Adhesive Trowel Grade at 1/8” thickness (approx. 8 gallons per 100 sq. feet.). 66 Modified Bitumen
Adhesive may be applied by serrated squeegee, roller, brush or trowel. Application of one or multiple
layer(s), allow a minimum of 15-20 minutes open air time before applying Cap Sheet or before each layer.
Do not exceed 2 layers when installing with adhesive. Cover all air intakes during application and
while drying. Application thickness, temperature, and number of membranes dictate how long it will take
for the product to fully dry. Please consult membrane manufacturer for specific information and
installation regarding their product.
COVERAGE RATE: Apply 66 Modified Bitumen Adhesive Brush Grade at the rate of 1 to 2 gallons per
100 sq. ft. On porous or irregular surfaces, 2 gallons per 100 sq. ft. may be required. 66 Modified Bitumen
Adhesive Trowel Grade should be applied at 1/8” thickness (approx. 8 gallons per 100 sq. feet.)
CAUTION: Do not use near open flame. Material is for building exterior applications only. Avoid breathing
solvent fumes and prolonged contact with skin. Excessive application may create blistering. Application at
temperatures below 40°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. Insure that proper ventilation is
maintained during application and drying to prevent solvent fumes from entering the building.
Exterior use only.
PACKAGING: Available in 5-gallon pails and 55-gallon drums.
If further information is needed, contact KARNAK Technical services at 800-526-4236.
PHYSICAL PROPERTIES &
SPECIFICATIONS
Weight per Gallon: 8.48 lbs. (Brush)
8.87 lbs. (Trowel)
Solids by Weight: 74% Nominal (Brush)
81% Nominal (Trowel)
Solids by Volume: 69% Nominal (Brush)
78% Nominal (Trowel)
Color: Black
Shear Strength: 18 lbs./sq. in.
Peel Strength: 10 lbs./sq. in.
Elongation: 200%
Recovery: 80%
Application Temp.: 40°F to 120°F
Set Time: 24-48 hours at 77°F and
50% relative humidity
Full System Cure: Approximately 30 days
Service Temp
(Cured Film): -15°F to 180°F
VOC Content: 250 g/L MAX
ASTM D3019 Type III