- UL Listed
- Weather Resistant
- Earns LEED Credits
- Water Borne
- Non-Flammable
- Low Odor
- Easy to Apply
- Made in U.S.A.
RCD Corporation® #9 Mastic® Low To High Velocity Air Duct Sealant is a water-borne sealant used for permanently sealing the fabricated joints and seams of sheet metal air ducts, UL listed rigid fiberglass air ducts, UL listed flexible air ducts and thermal insulation. RCD Corporation® #9 Mastic® is preferred by contractors for new fiberglass ductboard installations. It is ideal for repairing damaged and leaking air ducts and sealing conditioned spaces from air infiltration. Creating a termite monitoring zone in crawl spaces is easy with #9 Mastic®. Brush a thick, 3″ stripe of #9 Mastic® around the perimeter of the crawl space. This white stripe is easily monitored for termites crossing the line. Color is white and is easily applied by brush, extrusion or spray equipment. RCD Technical Bulletin lists spray and extrusion equipment solutions.