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OSI® SC-175 Acoustical Caulk



OSI® SC-175 Acoustical caulk is used to seals seams and gaps in an array of construction assemblies in order to prevent sound leakage.  If air can pass through an assembly, so can sound! OSI® SC-175 Acoustical Caulk is a non-flammable, latex-based sealant specially designed to reduce sound transmission and drafts in all types of wall systems where a sound-rated assembly is required.

Its primary function is to achieve and maintain the specific STC (Sound Transmission Class) value of the system designed. The paintable sealant remains flexible and adheres firmly to wood, metal studs, concrete, gypsum board and most other building materials. The sealant cleans up easily with soap and water.


  • Designed for use on sound rated wall systems
  • Reduces draft & sound transmission
  • Permanently flexible
  • Easy application & clean up
  • VOC Compliant
  • Non-staining & non-migrating


  • Size:28 fl. oz. tube
  • Color:White
  • Appearance:Non-slumping paste
  • Coverage:per one 28 fl. oz. cartridge (Note: yields shown are based on theoretical calculations, for comparison purposes, and will vary depending on ambient conditions and particular application.)
  • A 1/4″ bead extrudes approximately 86 linear feet
  • A 3/8″ bead extrudes approximately 38 linear feet
  • OSI sealant is paintable


  • Commercial construction utilizing light weight cavity walls and floor systems
  • Office buildings, hotels, apartment complexes and other types of commercial and residential construction
  • Exposed and unexposed applications at perimeter joints, floor and ceiling runners, cutouts in gypsum board, veneer plaster systems and other areas where a sound rated assembly is required
  • Sealant can also be applied or buttered around all electrical boxes and outlets, cold air returns, heating and air conditioning ducts and other utility equipment penetrating wall surfaces for increased acoustical performance
  • Works well for sealing sill and base plates in residential construction


  • Underwater applications or permanent water immersion
  • Applications requiring temperature resistance greater than 170°F (77°C)
  • Use on mirrors and metals that will corrode
  • Bonding two non-porous surfaces
  • Polyethylene, polypropylene, polytetrafluoroethylene (PTFE)/Teflon® or nylon
  • Cement Board (Durock®)


Additional information

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