Orton SSB Self-Supporting Witness Cones Box of 25
Original price was: $13.20.$11.88Current price is: $11.88.
Self-Supporting Cones are the most accurate and easiest to use witness cones available. They provide the same information as Orton Large Cones. The advantage of Self-Supporting cones is that they are the correct height (1 3/4″ exposed above the base) and have the 8 degree bending angle built in. They do not require plaques. Self-Supporting cones can be set on any flat surface.
Self Supporting Cones are recommended by glaze and kiln manufacturers to achieve the best results.
Details
- cone Options: 01, 010, 011, 012, 013, 014, 015, 016, 017, 018, 019, 02, 020, 021, 022, 03, 04, 05, 06, 07, 08, 09, 1, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9
Product Overview
Pyrometric cones are used worldwide to monitor ceramic firings in industrial kilns, pottery kilns, and small hobby kilns where the consistent temperature is important to the quality of the final product being fired. Pyrometric cones measure heat-work, the effect of time, and temperature. Over time, kilns sometimes drift from their setpoint even though “Nothing has changed”. Pyrometric cones will be the first to let you know your ceramic firing is under control or that subtle changes are taking place within your kiln, allowing you to take corrective action before they impact your ware.
Selecting the proper cones
Utilize the Orton Cone Temperature Equivalents Chart to select the correct cone numbers you will need. Selecting Orton’s self-supporting cones will solve the issue of correct mounting height and angle for you.
Example: You are firing to 1,147°C and the heating rate for the final 100°C is 75°C/hr. Select the heating rate column closest to your rate, which is 60°C, you scan down to 1,147°C, which is greater than the temperature equivalent for cone 2 and less than the temperature equivalent for cone 3, therefore your target cone should be cone 3. If your firing profile includes a soak at the maximum temperature then you should increase the target cone by one to two cone numbers for a one-hour soak and two to three cone numbers for a soak of two hours.
Once you have defined the cone number you need for your kiln’s firing profile initially you should select one cone number above and one cone number below your target cone. Fire a test of the three cones in your kiln to determine the exact fit to your firing profile. Measure the target cone’s deformation with the Orton cone measurement template. If the target cone’s final position after firing is between 25 and 75 degrees then you have selected the correct cone for your kiln’s profile.
Cone/Temperature Conversion Chart |
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| Cone | Temp at 108ºF | Temp at 270ºF | Kiln Color | Ware and Glaze Types |
| 10 | 2345 | 2381 | White | Stoneware Glaze |
| 9 | 2300 | 2336 | ||
| 8 | 2280 | 2320 | ||
| 7 | 2262 | 2295 | ||
| 6 | 2232 | 2269 | Porcelain Bisque | |
| 5 | 2167 | 2205 | ||
| 4 | 2124 | 2161 | Porcelain Glaze | |
| 3 | 2106 | 2138 | ||
| 2 | 2088 | 2127 | ||
| 1 | 2079 | 2109 | ||
| 01 | 2046 | 2080 | Yellow | |
| 02 | 2016 | 2052 | ||
| 03 | 1987 | 2019 | ||
| 04 | 1945 | 1971 | ||
| 05 | 1888 | 1911 | ||
| 06 | 1828 | 1855 | Bisque,Low Glaze | |
| 07 | 1789 | 1809 | Orange | Red Family Glazes |
| 08 | 1728 | 1753 | ||
| 09 | 1688 | 1706 | ||
| 010 | 1657 | 1679 | ||
| 011 | 1607 | 1641 | ||
| 012 | 1582 | 1620 | ||
| 013 | 1539 | 1582 | Red | |
| 014 | 1485 | 1540 | ||
| 015 | 1456 | 1504 | ||
| 016 | 1422 | 1465 | ||
| 017 | 1360 | 1405 | Glass Sagging | |
| 018 | 1319 | 1353 | China Paints | |
| 019 | 1252 | 1283 | Metallics, Lusters | |
| 020 | 1159 | 1180 | Dull Red | Decals |
| 021 | 1112 | 1143 | Glass Paint | |
| 022 | 1087 | 1094 | ||
Download a more in Orton depth cone chart here.
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