By mike montagne from Sumpter, OR on November 9, 2012
I've seen our stovepipe get to a dull red color, indicating probably around 1,200 degrees. I'm wondering if this sealant gives off any toxic or carcinogenic chemicals at any heat, either during regular usage (perhaps usually 250-350 degrees) to the exceptional (rare, but possible) 1,200 degrees or so?
Also, should our stovepipe reach this range, what would the consequence to this sealant be?
By Collin C. - NFI Master Hearth Professional on November 9, 2012
Depending on the stove, it is indeed possible to achieve temperatures of 1,200 degrees or greater. Single wall stovepipe can indeed glow red during extended burns. This sealant would not give off any harmful vapors with high heat; however, it could separate if overheated by more than a couple hundred degrees.
I would recommend using a high temperature furnace cement, such as Rutland Pre-Mixed Black Furnace Cement
. This type of product can readily handle the high flue temperatures your stove can generate.