Cone 08 temperature
Orton cone 08 bends at 1728 °F (942 °C) at 108 °F/hr and 1753 °F (956 °C) at 270 °F/hr. It sits in the low fire range — cone 15 of 38 on the chart, counting up from 022.
108 °F/hr · 60 °C/hr
1728 °F942 °C
Medium — the rate most charts quote
270 °F/hr · 150 °C/hr
1753 °F956 °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 1728 °F is not the same as firing to cone 08 — put a witness cone on the shelf.
Cone 08 is not cone 8
The leading zero means cone 08 counts down from cone 1 — it's a low fire temperature (1728 °F). Cone 8 is 552 °F hotter (2280 °F), in the high fire range.
What cone 08 is used for
Low fire — Below the usual bisque range. Some low-fire glazes, glass, and enamel work land here; cone 010–08 appears as a soft bisque for very porous ware.
Cone 08 compared
| Comparison | At 108 °F/hr | Difference (medium) | Difference (fast) | |
|---|---|---|---|---|
| cone 08 vs cone 8 | 1728 → 2280 °F | 552 °F (307 °C) | 567 °F (315 °C) | cone 8 is hotter |
| cone 08 vs cone 09 | 1688 → 1728 °F | 40 °F (22 °C) | 47 °F (26 °C) | cone 08 is hotter |
| cone 08 vs cone 07 | 1728 → 1789 °F | 61 °F (34 °C) | 56 °F (31 °C) | cone 07 is hotter |
| cone 08 vs cone 06 | 1728 → 1828 °F | 100 °F (56 °C) | 102 °F (57 °C) | cone 06 is hotter |
| cone 08 vs cone 04 | 1728 → 1945 °F | 217 °F (121 °C) | 218 °F (121 °C) | cone 04 is hotter |
| cone 08 vs cone 5 | 1728 → 2167 °F | 439 °F (244 °C) | 452 °F (251 °C) | cone 5 is hotter |
| cone 08 vs cone 6 | 1728 → 2232 °F | 504 °F (280 °C) | 516 °F (287 °C) | cone 6 is hotter |
| cone 08 vs cone 10 | 1728 → 2345 °F | 617 °F (343 °C) | 628 °F (349 °C) | cone 10 is hotter |
Convert
cone 08 bends at
1728 °F(942 °C)
At 108 °F/hr (60 °C/hr) — medium. Faster firing → the same cone bends hotter. Everything about cone 08 →
Questions
- What temperature is cone 08?
- Orton cone 08 bends at about 1728 °F (942 °C) when the kiln climbs at 108 °F per hour, and about 1753 °F (956 °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 08 in Celsius?
- 942 °C at 108 °F/hr (60 °C/hr) and 956 °C at 270 °F/hr (150 °C/hr), converted from Orton's Fahrenheit chart for self-supporting regular cones.
- Is cone 08 the same as cone 8?
- No — and this is the most common cone mix-up. Cones with a leading zero count down toward cone 1, so cone 08 is cooler than cone 8: about 1728 °F versus 2280 °F at 108 °F/hr, a difference of 552 °F. Read the zero as "oh", not as nothing.
- What is cone 08 used for?
- cone 08 sits in the low fire range. Below the usual bisque range. Some low-fire glazes, glass, and enamel work land here; cone 010–08 appears as a soft bisque for very porous ware.
- How far is cone 08 from cone 09 and cone 07?
- At 108 °F/hr, cone 09 bends 40 °F cooler (1688 °F) and cone 07 bends 61 °F hotter (1789 °F). One cone step is not a fixed number of degrees — the spacing varies across the chart.
Firing to cone 08? Claybench schedules the kiln around it.
Clay body, glazes, and firing schedule are matched by cone before a plan is saved.