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Fiberlock IAQ 8500 HVAC Insulation Sealant (5 GL)

Item #
5 Gallon Pail    Qty: 1
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  • Coverage: 75-175 sq ft per gallon
  • Goes on black, dries black
  • Contains EPA-registered fungicide
  • For use on lined and/or unlined duct work
Availability: Typically in stock (Details)

Product Information

Fiberlock IAQ 8500 is a dual-purpose, high performance coating designed to penetrate and reinforce duct liner or duct board insulation materials.


It can also be used to seal unlined duct work to prevent microbial particulate from becoming airborne.


Fiberlock IAQ 8500 is a non-flammable, water-based formulation that forms a flexible membrane in duct liner insulation materials. It is high in viscosity to provide maximum binding ability on insulation materials.


IAQ 8500 is manufactured from premium acrylic resins to allow for optimal durability and flexibility, necessary for air duct environments. It contains an EPA-registered fungicide to prevent mold from growing on the surface of the cured film.


Successfully tested to ASTM standard C- 411 “Hot Surface Performance of a Coating on Glass Fiber Blanket Insulation.” ASTM E-84 Class “A” fire rating. Meets requirements of NFPA 90A/90B standard.



  • Brush, roller or airless sprayer
    • Brush:
      • Sunthetic, nylon, or polyester bristle
    • Roller:
      • Synthetic fiber 3/8" nap or longer
    • Airless Spray settings:
      • Pressure: 2,500 - 3,000 PSI
      • Hose length: 50 feet
      • Hose diameter: 1/4 inch
      • Tip size: 0.019 - 0.023
      • Fan size: 12 inches


More Information
Prop 65 Text This product can expose you to chemicals including Carbon black and Chlorothalonil which are known to the State of California to cause cancer. For more information go to
Application Mold Remediation
Max Coverage Per Gallon 175
Color Black
Category Encapsulant\Coating
pH 8.5
Brand Fiberlock
Approved Use HVAC System, Mold Remediation
Condition new