Foster® Duct Liner Insulation Sealer

Foster® 40-23TM Duct Liner Insulation Sealer is a water-based material specially formulated for application to HVAC duct liner or duct board insulations. Foster Duct Liner Insulation Sealer penetrates deeply into the existing insulation materials and, upon cure, reinforces the cohesive strength of the insulation materials, forming a tight, damage-resistant surface. Foster Duct Liner Insulation Sealer applied to the interior surfaces of unlined HVAC duct-work, subsequent to source removal, effectively and economically reduces particle release.

Foster® 40-23 is non-flammable when wet and fire-resistive when dry. The dry film stays flexible and moisture resistant. It will not cause flash rusting on metal surfaces. 

Foster® 40-23 is formulated to maintain excellent resistance to the deteriorating effects of fungus or molds. 

Foster®40-23 meets requirements for LEED® EQ Credit 4.2, low-emitting materials: paints and coatings. 

Foster® 40-23 contains no asbestos, lead, mercury, or mercury compounds. It meets NFPA 90A and 90B 25/50 requirements.