Metacaulk 350i Intumescent Firestop Sealant

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.

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Brand : Metacaulk
Performance Our on-site fire test laboratory is designated under the UL Witness Test Data Program (WTDP), allowing for thorough product development, direct testing and advanced response to customer needs for UL Listed systems.
Versatility Metacaulk systems offer a holistic approach to firestop applications and where field conditions differ, Metacaulk can support with structured engineered solutions.
COST SAVINGS Metacaulk products & systems offer major advantages for the installer with economical and reliable solutions.

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The Industry's Best Product Warranties

Minimum 3-year limited warranty on RectorSeal Products. No registration required.


Outstanding Technical Customer Support

Providing exceptional technical customer support for on-site job requirements and project specifications.

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Delivering a seamless purchasing experience by offering a diverse selection of products, ensuring availability and quick fulfillment.

Complimentary eTraining Courses

Offering a variety of eTraining from self-directed courses via RectorSeal Academy, on-demand one-on-one training or live webinars.


“RectorSeal is commited to achieve Total Customer Satisfaction by exceeding customer’s expectations, requirements and needs”

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VOICE OF THE CUSTOMER Monitoring the Voice of Customer and taking appropriated actions.
talents and competencies Effectively developing all employees’ talents and competencies.
key performance indicators Tracking and improving our Key Performance Indicators (KPIs).
Quality products Establishing robust processes to deliver quality products.
on-time and complete Delivering on-time and complete customer orders.
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