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Fiberlock IAQ 8500 HVAC Insulation Sealant (5 GL)

Item #
5 Gallon Pail    Qty: 1
Mfr. Model #
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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
  • Buying 10 or more: $164.95

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
Additional Info

Additional Info

  • Solids by weight: 52 +/-2%
  • Volatile: Water
  • Average particle size: 0.2 microns
  • Viscosity at 77°F: 110-120 KU
  • Weight per gallon at 77°F: 10.2 lb
  • Film Hardness: Excellent
  • Film Flexibility: Excellent
  • Impact Resistance: Excellent
  • Water resistance dry film: Excellent
  • Bridging effectiveness: Excellent
  • Application tools:
    • Brush
      • Synthetic, nylon or polyester bristle
    • Roller
      • Synthetic Fiber 3/8”nap or longer
    • Airless Sprayer
      • Pressure: 2,500 - 3,000 PSI
      • Max Hose length: 50 feet
      • Hose diameter: 1/4 inch
      • Tip size: 0.019 - 0.023
      • Fan size: 12 inches
  • Flash point: Non-combustible
  • Dry Time: 1 - 2 hours
  • Shelf Life at 77°F: 36 months min (original factory sealed containers)
  • Odor: Indoors, virtually odorless


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
Brand Fiberlock
Category Encapsulant/Coating
Color Black
Approved Use HVAC System, Mold Remediation
Max Coverage Per Gallon 175
Application Mold Remediation
pH 8.5
Condition new
Manufacturer Model Number 8385
Xactimate Code PNT DCTLF - Prime and paint ductwork - hot or cold air (by linear foot)
Safety Data Sheet (SDS)
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