Single component, water-based elastomeric acrylic sealant

Seals gaps and transitions prior to air barrier coating application

Passes NFPA 285 Fire Test

VOC Content: <30 g/L MAX

NFPA 285 Fire-Rated Assembly

323 K-NRG Gap Seal FR™ to seal gaps around windows, doors, rough openings, changes in angles, transitions between dissimilar materials and joints in wall substrates. When combined with KARNAK’s air barrier coatings and accessories, 323 K-NRG Gap Seal FR prevents air passage and helps for a complete wall air-barrier system. Commonly used on a variety of wall substrates and sheathing prior to the installation of exterior cladding.

Weight per Gallon: 12.4 lbs.
Solids by Weight: 75% Nominal
Nominal Solids by Volume: 50% Nominal
Color: Red
Dry Time: 2 hrs. to touch; 24 hrs. firm set at 60°F, 50% RH
Elongation: 160%, Nominal ASTM D412
Tensile Strength: 125 PSI, Nominal ASTM D412
Cure Time: 24 to 48 hours @ 77°F and 50% Relative Humidity
Application Temp.: 40°F to 120°F.
Service Temp (Cured Film): -40°F to 160°F

SURFACE PREPARATION:
‍Surfaces should be clean and free of frost, oil, grease, dirt, excess mortar or other contaminants. All surfaces must be sound, dry (except damp concrete). New concrete should be cured for a minimum of 7 days before 323 K-NRG Gap Seal FR is applied.

APPLICATION:
‍323 K-NRG Gap Seal FR may be applied by brush or trowel. Application should be free of voids when transitioning onto applied flashing membrane to create a uniform air-barrier. Regularly monitor wet mil thickness during application to assure adequate coverage. Joints between panels of exterior grade gypsum, plywood and rigid insulation up to 1/4” wide should be filled with a trowel application of 323 K-NRG Gap Seal prior to application of liquid membrane. Press material firmly with trowel or brush over the area to seal. Spread sealant to an average thickness of 1/16” (64 wet mils).

Joints between 1/4” – 1/2” wide should be three-coursed with 323 K-NRG Gap Seal FR and reinforcement fabric. Spread sealant to an average thickness of 1/16”. Immediately embed reinforcing fabric into the wet material and smooth out. Apply another application over the fabric and feather onto surface. Reinforcing fabric should extend 3” beyond each side of the joint.

Joints wider than 1/2” are not permitted. Steps should be taken to use an appropriate backer material to fill the joint first before three-coursing with 323 K-NRG Gap Seal FR and reinforcement fabric. Transition joints between two dissimilar materials such as at beams, columns, window and door frames, etc., should be three-coursed with 323 K-NRG Gap Seal and reinforcement fabric. Center fabric reinforcement so that it extends a minimum of 3” onto both substrates (Refer to local code for flashing requirements on the exterior wall assembly).

323 K-NRG Gap Seal FR is not designed for permanent exposure. Product is designed to withstand job site exposure for up to 9 months, however, good construction practice calls for covering as soon as possible. Wherever possible, begin covering membrane on south exposures, followed by remainder of surface.

COVERAGE RATE:
Apply at an average thickness of 1/16” (64 wet mils) which equates to 4 gallons per 100 sq. ft., in one application. When using fabric reinforcement an additional application will be needed at the same rate of application.

‍PROTECT FROM FREEZING. 
Product must be protected from damage during construction. Do not apply to wet surfaces, except damp concrete. Coating not designed for permanent exposure to weather. Protect as soon as possible. However, coating may be exposed up to 9 months, if necessary. 323 K-NRG Gap Seal FR shall not be applied when ambient (air) and substrate temperatures are below 40°F (5°C). The product should not be applied if it is raining, or rain is forecasted within 24 hours after application. Product should not be applied if it is expected that the ambient temperature will fall below 32°F within 48 hours. Ensure newly coated CMU walls are protected at the roof line to prevent water infiltration into the wall cavity. Close container when not in use.  Avoid prolonged contact with skin.  Use proper protective equipment during application. Avoid breathing of vapors as it may cause respiratory tract irritation. If swallowed, seek medical attention immediately. In case of eye contact, open eyelids wide and flush immediately with plenty of water for at least 15 minutes. Dispose of in an environmentally safe manner. Cover air intakes during application and while drying. Keep out of reach of children. Protect from freezing.

CARE OF TOOLS:
‍White material is still wet, tools may be cleaned with water. Dry coating can be cleaned with KARNAK 709 Karna-Klean or Xylene or similar solvent, taking the necessary precautions when handling flammable materials.