Heat tolerance of Fibreglass

wg_bent Posted By wg_bent, Jan 13, 2006 at 7:00 PM

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  1. wg_bent

    Minister of Fire

    Nov 19, 2005
    Poughkeepsie, NY
    Resource for this? not faced, just raw fibreglass.
  2. Rhone

    Minister of Fire

    Nov 21, 2005
    Unfaced fiberglass Melts at around 1100 degrees and I don't know what temp it can catch fire.
    Chimney Fire is 2000+ degrees, so decent chance fiberglass may melt during a chimney fire if in contact with liner.
    Mineral Wool insulation (same technique as fiberglass but different material) melts at over 2100 degrees and will maintain integrity during a chimney fire.

    Lastly, neither stops air flow. If one wants something to stop air flow, use a piece of sheet metal.

    A chimney fire can reach over 2000 degrees inside the liner, the outside during one will be cooler just don't know what the outside would be.
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