This chart compares the gassing behavior of 6 materials (5 of which are very common in ceramic glazes) as they are fired from 500-1700F. It is a reminder that some late gassers overlap early melters. The LOI (loss on ignition) of these materials can affect your glazes (e.g. bubbles, blisters, pinholes, crawling). Notice that talc is not finished until after 1650F (many glazes have already begin melting by then).
Pages that reference this post in the Digitalfire Reference Database:
Light Magnesium Carbonate, Ferro Frit 3124, Dolomite, Calcium Carbonate, Gerstley Borate, Talc, Frit, Firing: What Happens to Ceramic Ware in a Firing Kiln, Pinholing, Glaze Bubbles, LOI, 1400F-Gerstley Borate stops gassing, 1500F-Calcium carbonate, talc finished gassing, 1650F-Talc has finished gassing, 200C-Decarbonation, 1400F-Common frits begin melting, Glaze Blisters
This post is one of thousands found in the Digitalfire Reference Database. Most are part of a timeline maintained by Tony Hansen. You can search that timeline on the home page of digitalfire.com.