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    Silicone Sealants

    Sealants that are especially designed for high temperatures are needed for seating gaskets, sealing stove pipe, and setting roof flashing, as well as a number of other tasks associated with high temperatures stoves and their chimneys. Special formulations allow the sealants to maintain flexibility even under extreme conditions. Choose the sealant with correct temperature range for your application. Sealants are available in black, red, or clear so you can match brick, roofing materials, black stove pipe, or create a nearly invisible seal wherever it is needed.
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    Silicone Sealants Q&A with the NFI Certified Specialists

    * Please Note: All customer questions are answered by our NFI Certified Specialists free of charge!
    3 Questions & 3 Answers
    Chuck K
    from Levering, MI asked:
    December 1, 2021
    I will be installing a pellet stove and using a dura-vent metal chimney. Do you recommend a type of sealant on the twist to lock joints of this type chimney system?
    1 Answer
    The best choice for pellet vent joints is Mill-Pac sealant.  It resists higher temperatures than RTV silicone and does not cure hard, so you can still take the pipe apart for cleaning.
    Submitted by: Nevins P. on December 2, 2021

    Robert R.
    from VA asked:
    April 30, 2021
    What type of sealants do I need for a direct vent gas fireplace?
    1 Answer
    Generally speaking, high temperature RTV and, in some cases, a resin-based adhesive called mill-pac. The first few pages of the installation manual for any direct vent gas fireplace will list the additional items required for installation.
    Submitted by: Will M. on April 30, 2021

    Thomas R
    from Hickory, NC asked:
    March 19, 2019
    What sealant do I need to seal two metal stove exhaust pipes together? Is there a specific temperature? This will be leading to the chimney of a wood stove.
    1 Answer
    Generally, you would not use a sealant as they don't make them able to stand up to those temperatures. The stove pipes should fit together and then you can drill them together.
    Submitted by: Brennan W. on March 19, 2019

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