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Boss 38003 10.3 oz Contractor's Professional Grade Silicone Sealant, Aluminum


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  • Sealing heating, ventilating or air conditioning duct work
  • Seal cracks or gaps around windows, vents, ducts, fixtures and lights
  • Seal leaks in gutters, downspouts, ducts and piping
  • Seal cracks in interior walls and ceilings, door joints and fixtures
  • Seal electrical connections and boxes to waterproof
  • Bond gaskets in heating and refrigeration units
  • BOSS® 380 Contractor’s Silicone is a one-part acetoxy cure adhesive sealant that is suitable for general construction sealing and adhesive applications
  • This product will adhere to clean metal, glass, many types of wood, silicone resins, vulcanized silicone rubber, ceramics and plastic surfaces
  • A primer may be required for optimum adhesion to some substrates
  • Application Temperature: -35 to 140 deg F
  • Color: Aluminum
  • Cure Time: 7 days @ 77 deg F
  • Durometer, Shore A: 19
  • Elongation: 510
  • Extrusion Rate: 350 gr/min
  • Movement Capability: +/- 25 %
  • Service Temperature: -40 to 400 deg F
  • Slump: NIL
  • Tack-Free Time: 10-20 min
  • Tensile Strength: 300 psi