SEGAR CONES
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Segar cones may be purchased from most stockists of ceramic supplies. They are small clay pyramids designed to melt at predetermined temperatures. A number is cast into the side of each cone indicating the temperature that it will bend to its "end point". Usually three different cones are placed, at an angle from the vertical, in a lump of clay and placed in a convenient position in the kiln. The temperature at any one time can be estimated by looking through the sight hole and observing which cones have started to bend and melt. At any one time, the kiln temperature will be higher than the bent cone but lower than the ones still standing. |
Cones can provide a more reliable measurement of heat work than pyrometers. Cones should be set in a piece of clay at an angle of approximately 8o from the vertical.
CONE NO: |
END POINT |
CONE NO: |
END POINT |
012 |
840oC |
1 |
1125oC |
011 |
875 |
2 |
1135 |
010 |
890 |
3 |
1145 |
09 |
930 |
4 |
1165 |
08 |
945 |
5 |
1180 |
07 |
975 |
6 |
1190 |
06 |
1005 |
7 |
1210 |
05 |
1030 |
8 |
1225 |
04 |
1050 |
9 |
1250 |
03 |
1080 |
10 |
1260 |
02 |
1095 |
11 |
1285 |
01 |
1110 |
12 |
1310 |
13 |
1350 |
||
14 |
1390 |
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