Temperature Chart

Large Orton Brand Regular Self Supporting Cones

• Temperatures are approximate and in Farenheit. Note the difference in temperatures with degree rise per hour.
• Data taken from Cone Chart: http://www.ortonceramic.com/resources/pdf/wall_chart_horiz.pdf
• History of Cones http://www.ortonceramic.com/resources/video/history_qt.html
• Watch Self Supporting Cones Bend http://www.ortonceramic.com/resources/video/cone_bend_qt.html.

Temp	Faster	Cone	Description
108deg/hr	270deg/hr
180			Drying Temperature
212			Boiling point of water
250			Danger of Mechanical Water Explosion considered over
380			Organics in clay begin to smoke. Some danger of spalling.
451			Newspaper burns, close to Cristobolite Squeeze
885			Lowest visible red heat in darkened room. Carbon begins to slowly burn off near here
1063		022	Quart Inversion, Some Gold lusters fired here
1314	1350	018	Overglazes often fire here
1500			Calcium Carbonate decomposition begins here
1576	1616	012	Some people do a smoky reduction here to trap carbon in Shino type glazes, Good Chrome Lead Reads and Yellows around this Temperature
1728	1749	08	Some people bisque stoneware and earthenware here. Non shino body reduction begins here
1823	1852	06	Commercial (Duncan) Glazes, TAMUCCC Bisque
1940	1958	04	Most Modern Studio Majolica fired around here in the U.S.. Good Temperature for porcelain Bisque
2077	2109	1	Considered by many to be beginning of Midrange glazes. Body Reduction must be completed. "Some earhenware -likeowrk fired this hot"
2228	2266	6	Breaking point between stoneware and midrange. Upper Limit for lead glazes. Zinc Oxide starts to evaporate in reduction.
2340	2377	10	Stoneware, some porcelain
2379	2415	12	Our Stoneware starts to get soft.
2410	2455	13	Some French Porcelain