Heat tolerance of Fibreglass

  • Active since 1995, Hearth.com is THE place on the internet for free information and advice about wood stoves, pellet stoves and other energy saving equipment.

    We strive to provide opinions, articles, discussions and history related to Hearth Products and in a more general sense, energy issues.

    We promote the EFFICIENT, RESPONSIBLE, CLEAN and SAFE use of all fuels, whether renewable or fossil.
  • Hope everyone has a wonderful and warm Thanksgiving!
  • Super Cedar firestarters 30% discount Use code Hearth2024 Click here
Status
Not open for further replies.

wg_bent

Minister of Fire
Hearth Supporter
Nov 19, 2005
2,248
Poughkeepsie, NY
Resource for this? not faced, just raw fibreglass.
 
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.
 
Status
Not open for further replies.