36
Cone-Fire / Ramp-Hold
Do not leave your kiln unattended during operation.
Appendix D:
Temperature Equivalents
For Orton Self-Supporting Pyrometric Cones
°F
Cone
Self-Supporting Cones
Pre-Fire
Number
Color
Heated at:
27° F
108° F
270° F
Per Hour* Per Hour* Per Hour*
022
—
1087
1094
Green
021
—
1112
1143
Fuschia
020
—
1159
1180
Orange
019
1213
1252
1283
Yellow
018
1267
1319
1353
White
017
1301
1360
1405
Pink
016
1368
1422
1465
Light Blue
015
1382
1456
1504
Violet
014
1395
1485
1540
Gray
013
1485
1539
1582
Green
012
1549
1582
1620
Fuschia
011
1575
1607
1641
Orange
010
1636
1657
1679
Dark Red
09
1665
1688
1706
Dark Red
08
1692
1728
1753
Dark Red
07
1764
1789
1809
Dark Red
06
1798
1828
1855
Dark Red
05 1/2
1839
1859
1877
Dark Red
05
1870
1888
1911
Dark Red
04
1915
1945
1971
Dark Red
03
1960
1987
2019
Dark Red
02
1972
2016
2052
Dark Red
01
1999
2046
2080
Dark Red
1
2028
2079
2109
Dark Red
2
2034
2088
2127
Dark Red
3
2039
2106
2138
Dark Red
4
2086
2124
2161
Gray
5
2118
2167
2205
Green
5 1/2
2133
2197
2237
White
6
2165
2232
2269
Fuchsia
7
2194
2262
2295
Orange
8
2212
2280
2320
Yellow
9
2235
2300
2336
White
10
2284
2345
2381
Pink
*Rate of temperature increase during last 90 - 120
minutes of firing. Tables by courtesy of the Edward
Orton, Jr. Ceramic Foundation.
°C
Cone
Self-Supporting Cones
Pre-Fire
Number
Color
Heated at:
15° C
60° C
150° C
Per Hour* Per Hour* Per Hour*
022
—
586
590
Green
021
—
600
617
Fuschia
020
—
626
638
Orange
019
656
678
695
Yellow
018
686
715
734
White
017
705
738
763
Pink
016
742
772
796
Light Blue
015
750
791
818
Violet
014
757
807
838
Gray
013
807
837
861
Green
012
843
861
882
Fuschia
011
857
875
894
Orange
010
891
903
915
Dark Red
09
907
920
930
Dark Red
08
922
942
956
Dark Red
07
962
976
987
Dark Red
06
981
998
1013
Dark Red
05 1/2
1004
1015
1025
Dark Red
05
1021
1031
1044
Dark Red
04
1046
1063
1077
Dark Red
03
1071
1086
1104
Dark Red
02
1078
1102
1122
Dark Red
01
1093
1119
1138
Dark Red
1
1109
1137
1154
Dark Red
2
1112
1142
1164
Dark Red
3
1115
1152
1170
Dark Red
4
1141
1162
1183
Gray
5
1159
1186
1207
Green
5 1/2
1167
1203
1225
White
6
1185
1222
1243
Fuchsia
7
1201
1239
1257
Orange
8
1211
1249
1271
Yellow
9
1224
1260
1280
White
10
1251
1285
1305
Pink
*Rate of temperature increase during last 90 - 120
minutes of firing. Tables by courtesy of the Edward
Orton, Jr. Ceramic Foundation.