Manufacturer RectorSeal Fire Stopping Products
SKU: 150
Metacaulk MC-150 Firestopping Sealant

Metacaulk® MC 150+ is one component, general purpose fire-rated sealant and smoke seal for construction joints and through penetrations. It prevents the spread of flames, smoke, and gas through penetration openings. Metacaulk® MC 150+ is a water-based, non-sag caulking grade sealant that is easy to apply as well as to retrofit. Metacaulk® MC 150+ can be used on various penetrations such as the top of the wall construction joints, deflection track wall systems, EMT, telephone and power cables in concrete floors and walls, gypsum walls as well as wood floors. Metacaulk® MC 150+ may be applied with a caulking gun or trowel. For large applications, it may be pumped from the pail. Metacaulk® MC 150+ cures to an elastomeric seal that is suitable where dynamic movement is expected. 


  • Top of the Wall Construction Joints
  • Deflection Track Wall Systems
  • Up to 2" PVC/CPVC & ABS (Closed)
  • Crosslinked Polyethylene (PEX) tubing
  • Steel, Copper, Cast Iron and EMT Pipe
  • Telephone, Communication and Power Cables

Metacaulk® MC 150+ Features

  • Water Based
  • Excellent Freeze-Thaw
  • Flexible Set
  • Paintable
  • VOC Compliant
  • Safe and Easy to Use
  • Intumescent; expands when exposed to fire
  • Sound Transmission Class (STC) 51*

*Tested in a UL 411 wall assembly/section to ASTM E90.

MC 150+ Firestopping Sealant | Product Information

Product Code Size Quantity Per Case
10.3 oz Cartridge
20.2 oz Sausage Pack
30 oz Cartridge
5 Gallon

Additional Product Literature
Data Sheet
Safety Data Sheet