Cone 7 temperature
Orton cone 7 bends at 2262 °F (1239 °C) at 108 °F/hr and 2295 °F (1257 °C) at 270 °F/hr. It sits in the mid fire range — cone 31 of 38 on the chart, counting up from 022.
108 °F/hr · 60 °C/hr
2262 °F1239 °C
Medium — the rate most charts quote
270 °F/hr · 150 °C/hr
2295 °F1257 °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 2262 °F is not the same as firing to cone 7 — put a witness cone on the shelf.
Cone 7 is not cone 07
Cone 07 — with the leading zero — is 473 °F cooler (1789 °F), in the low fire range. Read the zero as “oh”; a glaze labeled for one will not behave at the other.
What cone 7 is used for
Mid fire — The most common range for functional stoneware and porcelain in electric kilns. Cone 6 is the modern default; cone 5 shows up on many commercial glazes.
Convention per Mastering Cone 6 Glazes (Hesselberth & Roy).
Cone 7 compared
| Comparison | At 108 °F/hr | Difference (medium) | Difference (fast) | |
|---|---|---|---|---|
| cone 7 vs cone 07 | 1789 → 2262 °F | 473 °F (263 °C) | 486 °F (270 °C) | cone 7 is hotter |
| cone 7 vs cone 6 | 2232 → 2262 °F | 30 °F (17 °C) | 26 °F (14 °C) | cone 7 is hotter |
| cone 7 vs cone 8 | 2262 → 2280 °F | 18 °F (10 °C) | 25 °F (14 °C) | cone 8 is hotter |
| cone 7 vs cone 06 | 1828 → 2262 °F | 434 °F (241 °C) | 440 °F (244 °C) | cone 7 is hotter |
| cone 7 vs cone 04 | 1945 → 2262 °F | 317 °F (176 °C) | 324 °F (180 °C) | cone 7 is hotter |
| cone 7 vs cone 5 | 2167 → 2262 °F | 95 °F (53 °C) | 90 °F (50 °C) | cone 7 is hotter |
| cone 7 vs cone 10 | 2262 → 2345 °F | 83 °F (46 °C) | 86 °F (48 °C) | cone 10 is hotter |
Convert
cone 7 bends at
2262 °F(1239 °C)
At 108 °F/hr (60 °C/hr) — medium. Faster firing → the same cone bends hotter. Everything about cone 7 →
Questions
- What temperature is cone 7?
- Orton cone 7 bends at about 2262 °F (1239 °C) when the kiln climbs at 108 °F per hour, and about 2295 °F (1257 °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 7 in Celsius?
- 1239 °C at 108 °F/hr (60 °C/hr) and 1257 °C at 270 °F/hr (150 °C/hr), converted from Orton's Fahrenheit chart for self-supporting regular cones.
- Is cone 7 the same as cone 07?
- No — and this is the most common cone mix-up. Cones with a leading zero count down toward cone 1, so cone 07 is cooler than cone 7: about 1789 °F versus 2262 °F at 108 °F/hr, a difference of 473 °F. Read the zero as "oh", not as nothing.
- What is cone 7 used for?
- cone 7 sits in the mid fire range. The most common range for functional stoneware and porcelain in electric kilns. Cone 6 is the modern default; cone 5 shows up on many commercial glazes.
- How far is cone 7 from cone 6 and cone 8?
- At 108 °F/hr, cone 6 bends 30 °F cooler (2232 °F) and cone 8 bends 18 °F hotter (2280 °F). One cone step is not a fixed number of degrees — the spacing varies across the chart.
Firing to cone 7? Claybench schedules the kiln around it.
Clay body, glazes, and firing schedule are matched by cone before a plan is saved.