Orton | SRB03
Small Pyrometric Cone 03 for Kiln-Sitter
Cone 03 in Orton's small series, made for the Dawson Kiln-Sitter. The sitter's sensing rod rests on it and the kiln shuts off as it bends, so this cone ends the firing instead of reporting on it afterwards.
$25
Suggested retail price. In-store prices and availability may vary by location.
This is Cone 03 in Orton's small regular SRB series, made for the Dawson Kiln-Sitter rather than the kiln shelf. Orton lists it bending at 1131°C (2068°F) at 300°C an hour, the only rate published for this size, measured in a gas fired kiln. The cone is tapered, so where the sensing rod sits on it makes a difference. The thin end fires cooler and the thick end hotter, and the gap between them is about half a cone. Small cones also bend 7 to 10°C (12 to 18°F) earlier than a self supporting cone of the same number, so do not use a self supporting figure for one of these. Orton lists cones in this part of the range for craft and art bodies, wall tile and glazes. Cones 010 through 3 are red iron bearing and can come out matte, green or bloated if the kiln is short of oxygen, and Orton does not make an Iron Free cone in this size.
- Cone 03
- Bends 1131°C (2068°F) at 300°C an hour, measured in a gas fired kiln
- 28.6 mm (1⅛ in) tall
- Sized for the Dawson Kiln-Sitter shut off
- Tapered, so its position under the sensing rod changes the result by about half a cone
- Bends 7 to 10°C (12 to 18°F) earlier than a self supporting cone
- Chart values assume a 23.8 mm (15/16 in) mounting height
- Red iron bearing, no Iron Free cone is made in this size
Downloads
Orton’s cone charts and guide to cones and firing.
