Metacaulk 350i Intumescent Firestop Sealant

Order By Phone 800-515-1002
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Pick Up Available in Westchester & NYC
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Metacaulk 350i is a 1-component, general purpose fire-rated sealant/smoke seal for construction joints & around penetrations in fire rated walls/floors. Prevents flames/smoke/hot gases/water spreading through joint openings & through penetrations.


  • Highly intumescent and Water Based, non-sag caulking grade sealant & easy to apply or retrofit, and Paintable
  • Excellent freeze-thaw, Flexible Set and Cures to an elastomeric seal suited where dynamic movement is expected.
  • STC rating 53 and VOC Compliant, Rated for 1, 2 and 3 hours & tested in accordance with the ASTM E814, (UL 1479), UL 2079 and ULC-S115-95 test standards.
  • Safe and Easy to Use- No dilution or mixing is required for use. No special skills are necessary for installation, Applied with a conventional caulking gun, bulk loading gun or can be troweled/pumped from the pail.
  • Minimum 3 Year Shelf Life and Protected from mold growth with in both wet/dry stages with a combination of biocides.