#8 Mastic




#8 Mastic® Applied to Duct Joint

  • UL Listed
  • Weather Resistant
  • Earns LEED Credits
  • Water Borne
  • Non-Flammable
  • Low Odor
  • Easy to Apply
  • Made in U.S.A.

#8 Mastic® Sheet Metal Duct Sealant


RCD Corporation® #8 Mastic® is a water-borne sheet metal air duct sealant used for permanently sealing the joints and seams of all duct types including UL-181 listed air ducts. RCD Corporation® #8 Mastic® is the best choice for high velocity sheet metal air duct construction used in auditoriums, high rises, hospitals, industrial ventilation systems, large retail stores, malls, military buildings, prisons, schools, sports centers and complexes. It remains flexible and withstands the constant joint movement of these demanding systems. Easy application by brush, trowel, palm, spray or extrusion.

Earns LEED credits. UL Listed. Color is gray and is easily applied by brush, extrusion, or spray equipment. See RCD Technical Bulletin for spray equipment solutions.

Please note: To order quantities greater than available through RCD’s online store please contact us at 352.589.0099 or send an email to customercare@rcdcorp.com and we will be happy to fulfill your order.