Cone 13 temperature
Orton cone 13 bends at 2428 °F (1331 °C) at 108 °F/hr and 2458 °F (1348 °C) at 270 °F/hr. It sits in the above studio range range — cone 37 of 38 on the chart, counting up from 022.
108 °F/hr · 60 °C/hr
2428 °F1331 °C
Medium — the rate most charts quote
270 °F/hr · 150 °C/hr
2458 °F1348 °C
Fast — typical of a quick electric firing
Orton self-supporting regular cones; rate measured over the last 200 °F of the firing. Source: Orton °F chart; °C converted. Cones measure heat-work, so a controller set to 2428 °F is not the same as firing to cone 13 — put a witness cone on the shelf.
Cone 13 is not cone 013
Cone 013 — with the leading zero — is 889 °F cooler (1539 °F), in the low fire range. Read the zero as “oh”; a glaze labeled for one will not behave at the other.
What cone 13 is used for
Above studio range — Hotter than nearly all studio work. Used for some porcelains, refractories, and industrial ceramics; most studio kilns are not rated for it.
Cone 13 compared
| Comparison | At 108 °F/hr | Difference (medium) | Difference (fast) | |
|---|---|---|---|---|
| cone 13 vs cone 013 | 1539 → 2428 °F | 889 °F (494 °C) | 876 °F (487 °C) | cone 13 is hotter |
| cone 13 vs cone 12 | 2383 → 2428 °F | 45 °F (25 °C) | 39 °F (22 °C) | cone 13 is hotter |
| cone 13 vs cone 14 | 2428 → 2489 °F | 61 °F (34 °C) | 65 °F (36 °C) | cone 14 is hotter |
| cone 13 vs cone 06 | 1828 → 2428 °F | 600 °F (333 °C) | 603 °F (335 °C) | cone 13 is hotter |
| cone 13 vs cone 04 | 1945 → 2428 °F | 483 °F (268 °C) | 487 °F (271 °C) | cone 13 is hotter |
| cone 13 vs cone 5 | 2167 → 2428 °F | 261 °F (145 °C) | 253 °F (141 °C) | cone 13 is hotter |
| cone 13 vs cone 6 | 2232 → 2428 °F | 196 °F (109 °C) | 189 °F (105 °C) | cone 13 is hotter |
| cone 13 vs cone 10 | 2345 → 2428 °F | 83 °F (46 °C) | 77 °F (43 °C) | cone 13 is hotter |
Convert
cone 13 bends at
2428 °F(1331 °C)
At 108 °F/hr (60 °C/hr) — medium. Faster firing → the same cone bends hotter. Everything about cone 13 →
Questions
- What temperature is cone 13?
- Orton cone 13 bends at about 2428 °F (1331 °C) when the kiln climbs at 108 °F per hour, and about 2458 °F (1348 °C) at 270 °F per hour. Cones measure heat-work — temperature over time — so the faster you fire, the hotter the kiln has to get for the same cone to bend.
- What is cone 13 in Celsius?
- 1331 °C at 108 °F/hr (60 °C/hr) and 1348 °C at 270 °F/hr (150 °C/hr), converted from Orton's Fahrenheit chart for self-supporting regular cones.
- Is cone 13 the same as cone 013?
- No — and this is the most common cone mix-up. Cones with a leading zero count down toward cone 1, so cone 013 is cooler than cone 13: about 1539 °F versus 2428 °F at 108 °F/hr, a difference of 889 °F. Read the zero as "oh", not as nothing.
- What is cone 13 used for?
- cone 13 sits in the above studio range range. Hotter than nearly all studio work. Used for some porcelains, refractories, and industrial ceramics; most studio kilns are not rated for it.
- How far is cone 13 from cone 12 and cone 14?
- At 108 °F/hr, cone 12 bends 45 °F cooler (2383 °F) and cone 14 bends 61 °F hotter (2489 °F). One cone step is not a fixed number of degrees — the spacing varies across the chart.
Firing to cone 13? Claybench schedules the kiln around it.
Clay body, glazes, and firing schedule are matched by cone before a plan is saved.