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50-250C (122-482F) | 80-250C (176-482F) | 120C (248F) | 150C (302F) | 180C (356F) | 185C (365F) | 200-1000C (392-1832F) | 200-450C (392-842F) | 200C (392F) | 210-280C (410-536F) | 260C (500F) | 290C (554F) | 300C (572F) | 300-330C (572-626F) | 300C (572F) | 370C (698F) | 370-700C (698-1292F) | 400-600C (752-1112F) | 400C (752F) | 425-650C (797-1202F) | 470-1200C (878-2192F) | 500-600C (932-1112F) | 512C (953F) | 540-600C (1004-1112F) | 650-900C (1202-1652F) | 750-850C (1382-1562F) | 750-1000C (1382-1832F) | 760C (1400F) | | 787C (1448F) | 800-1100C (1472-2012F) | 815C (1499F) | 815C (1499F) | 843C (1549F) | 850-950C (1562-1742F) | 850C (1562F) | 850C (1562F) | 870-900C (1598-1652F) | 871C (1599F) | 900C (1652F) | 900-1000C (1652-1832F) | 900C (1652F) | 926C (1698F) | 932C (1709F) | 954C (1749F) | 980C (1796F) | 982C (1799F) | 990C (1814F) | 1025-1325C (1877-2417F) | 1025C (1877F) | 1050C (1922F) | 1050C (1922F) | 1065-1120C (1949-2048F) | 1082C (1979F) | 1100C (2012F) | 1100C (2012F) | 1100C (2012F) | 1100C (2012F) | 1300C (2372F) | 1325C (2417F) | 1330C (2426F) | 1360C (2480F) | 1418-1428C (2584-2602F) | 1420C (2588F) | 1510C (2750F) | 1550C (2822F) | 1565C (2849F) | 1650C (3002F) | 1785C (3245F) | 1990C (3614F) | 2300C (4172F) | 2320C (4208F)

760C (1400F)

Gerstley Borate stops gassing

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A chart showing weight-loss vs firing temperature for common ceramic materials

This picture has its own page with more detail, click here to see it.

This chart compares the decompositional off-gassing (% weight Loss on Ignition) behavior of six glaze materials as they are heated through the range 500-1700F. It is amazing how much weight some can lose on firing - for example, 100 grams of calcium carbonate generates 45 grams of CO2! This chart is a reminder that some late gassers overlap early melters. That is a problem. The LOI of these materials can affect glazes (causing bubbles, blisters, pinholes, crawling). Talc is an example: It is not finished gassing until 1650F, yet many fritted glazes have already begun melting by then. Even Gerstley Borate, a raw material, begins to melt while talc is barely finished gassing. Dolomite and calcium carbonate Other materials also create gases as they decompose during glaze melting (e.g. clays, carbonates, dioxides).

By Tony Hansen
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