Metacaulk 350i Intumescent Firestop Sealant

Metacaulk 350i Intumescent Firestop Sealant

Customer Reviews

:In stock

: 66616

: Adhesive

: Metacaulk

: Adhesive, Shop Metacaulk Firestop Products


  • 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

    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.

    Product Code Size Quantity UPC Interleaved Dimensions Cubic Feet
    66616 10.3oz cartridge 12 021449666169 10021449666166 8x6x12 .34
    66613 5 Gallon 1 021449666138 NA
    13 diax14

      Returns Policy

      You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

      You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

      If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.


      We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

      When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

      Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.