Metacaulk 350i Intumescent Firestop Sealant

Metacaulk 350i Intumescent Firestop Sealant


  • Flexible cure
  • Excellent freeze-thaw
  • For interior use – paintable
  • STC rating 53
  • Tested to ASTM E814 (UL 1479) & ASTM E1966 (UL 2079)
  • 3 year shelf life
  • Complies to UL required Accelerated Aging and High Humidity Testing
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SKU: 66616, 66611, 66613 Category:

Product Description

Metacaulk® 350i is a one-component, general purpose fire-rated sealant and smoke seal for construction joints and through-penetrations.

Metacaulk® 350i is an intumescent, water-based, non-sag caulking grade sealant that is easy to apply and great for retrofits. It cures to an elastomeric seal that is suitable where dynamic movement is expected. Can be applied to horizontal and vertical interior surfaces. Application temperature 40°F to 120°F. Sound Transmission Class (STC) rating 53, The test was performed in accordance with ASTM E 90, Standard Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements.


Listing of Approved Systems

FBC™ System Compatible indicates that this product has been tested, and is monitored on an ongoing basis, to assure its chemical compatibility with Flowguard Gold®, Blazemaster® and Corzan® piping systems and products made with TempRite® Technology.

The FBC System Compatible Logo, FBC™, FlowGuard Gold®, BlazeMaster®, Corzan® and TempRite® are trademarks of Lubrizol Advanced Materials, Inc. or its affiliates.

Product Codes And Case Sizes
Product CodeSizeQuantityUPCInterleavedDimensionsCubic Feet
66616 10.3oz cartridge 12021449666169 10021449666166 8x6x12 .34
66611 20.2oz Sausage Pk. 12021449666114 10021449666111 9x14x7 .51
66613 5 Gallon 1021449666138 NA13 diax14 1.08