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Heat tolerance of Fibreglass

Post in 'The Hearth Room - Wood Stoves and Fireplaces' started by wg_bent, Jan 13, 2006.

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  1. wg_bent

    wg_bent Minister of Fire

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    Resource for this? not faced, just raw fibreglass.

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  2. Rhone

    Rhone Minister of Fire

    Joined:
    Nov 21, 2005
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    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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