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50-250C | 80C-250C | 120C | 150C | 180C | 185C | 200C | 200C-1000C | 200C-450C | 210C-280C | 250C-370C | 260C | 290C | 300C-330C | 300C | 370-950C | 400C-600C | 400C | | 480C-600C | 500C-600C | 512C | 535C | 540C-600C | 650C-900C | 700F | 750C-1000C | 750-850 | 800C-1100C | 850-950 | 850C | 850C+ | 900-1000 | 900C | 990C | 1025-1325 | 1025C+ | 1050C | 1050C | 1082C | 1100C+ | 1100C | 1100C | 1300C | 1325C | 1330C | 1360C | 1400F | 1400F | 1418C-1428C | 1420C | 1500F | 1550C | 1565C | 1600F-1650F | 1650F | 1785C | 1800F | 1950F-2050F | 1990C | 2300C | 2320C | 2750F

425C-650C

Sulfur evolution

This happens on first fire for many bodies. Sulfur is an impurity in many ball clays and related stoneware and earthenware raw clays, it occurs as calcium sulfate (selenite, the same mineralogy as plaster). Different sources indicate wider and narrower ranges for this, it is difficult to establish exactly.

Related Information

Links

Hazards Sulfur Dioxide Toxicity
This gas can be produced when clays are fired in a kiln. What can you do?
URLs http://en.wikipedia.org/wiki/Sulfur
Sulfur at Wikipedia
Minerals Selenite

By Tony Hansen


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