Orton Cones

Pyrometric Cone Temperature Equivalents
Cone	Large Cones		Self-Supporting Cones		Junior and Bars
	Heating Rate °F/Hour (last 90-120 minutes of firing)
	108°	270°	108°	270°	540°
022	N/A	N/A	1087	1094	1166
021	N/A	N/A	1112	1143	1189
020	N/A	N/A	1159	1180	1231
019	1249	1279	1252	1283	1333
018	1314	1350	1319	1353	1386
017	1357	1402	1360	1405	1443
016	1416	1461	1422	1465	1517
015	1450	1501	1456	1504	1549
014	1485	1537	1485	1540	1598
013	1539	1578	1539	1582	1616
012	1576	1616	1582	1620	1652
011	1603	1638	1607	1641	1679
010	1648	1675	1657	1679	1686
09	1683	1702	1688	1706	1751
08	1728	1749	1728	1753	1801
07	1783	1805	1789	1809	1846
06	1823	1852	1828	1855	1873
05	1886	1915	1888	1911	1944
04	1940	1958	1945	1971	2008
03	1987	2014	1987	2019	2068
02	2014	2048	2016	2052	2098
01	2043	2079	2046	2080	2152
1	2077	2109	2079	2109	2163
2	2088	2124	2088	2127	2174
3	2106	2134	2106	2138	2185
4	2120	2158	2124	2161	2208
5	2163	2201	2167	2205	2230
6	2228	2266	2232	2269	2291
7	2259	2291	2262	2295	2307
8	2277	2316	2280	2320	2372
9	2295	2332	2300	2336	2403
10	2340	2377	2345	2381	2426
11	2359	2394	2361	2399	2437
12	2379	2415	2383	2419	2471

 We carry Orton Cones.  Orton is the leader in temperature measurement and control. Cones are crucial in successful firings of your work - don’t take chances with cheaper brands. Orton Cones are the best!

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                 Kiln Sitters or Controllers
  A Kiln Sitter is a shut-off device, but should not be            considered the determining factor with reference to proper heat work. The cone in the sitter has additional variables that affect its melt: proximity to the kiln wall and elements and the weight of the sensing rod resting on it. When a Junior Cone is used, the tapered shape can cause variances if positioned too far right or left. Because of these other factors, a kiln sitter cone can deform prematurely, shutting down the firing before proper heat work is complete.

Programmable Controllers

Programmable controllers are much more accurate than kiln sitters if you pay attention to your ramp rates - especially toward the end of the firing. By following the heating (ramp) rate on Orton’s Cone Chart for at least the last 90-120 minutes of firing, you can be fairly certain that the degree temperature equivalent on the chart will be the end point of your firing.

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Cones measure the effects of time and temperature and is called heat work. The cone number determines the measurement of heat work. The cone chart is the temperature at which a cone bens. Glazes and clays are made to mature at specific cone numbers. When a clay or glaze is labeled cone 6 , it most be fired cone 6 to mature.

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