Originally Posted by CCBrewer
please note, most if not all wool insulation is merely Fire resistant, not fire proof.
Well maybe I correct myself here. I imagine a direct flame for extended period of time would cause a problem. But then again this is used for a mashtun, not a boil kettle. As such there is no reason on earth you would be blasting a burner at this which such voracity that flames are licking up the sides.
The stuff is rated to 1200F. I will say that I had my burner (BG-12) on full throttle getting my water to 154F. There were no flames going up the sides and certainly no issue with burning or even a scent or weird smell.