Expert: Jan Rodwell - 12/21/2001

Question
What are the firing temps for bisque earthenware and stoneware?

Answer
Suggested firing guide: Stoneware biscuit
1000c (cone 06)
100c per hour up to 600c, then 130c per hour up to 1000c.

Suggested firing guide: Stoneware gloss reduction
1280-1300c (cone 10)
150c per hour up to 1060c, then 120c per hour up to 1280-1300c

Suggested firing guide: Stoneware gloss oxidation
1280-1300c (cone 10)
150c per hour up to 1280-1300

Suggested firing guide: Earthenware biscuit
1150c (cone 2)
100c per hour up to 600c, then 150 per hour up to 1150c
A relatively high biscuit temperature is used with this clay body to reduce the incidence of crazing in the glaze while retaining the clay's porosity.  Other clays may benefit from a lower biscuit temperature (1120-1140c) depending on their maturing temperatures (check the bag).

Suggested firing guide:  Earthenware gloss (Alkaline)
1060c (cone 04)
130c per hour up to 1060c

Suggested firing guide:  Earthenware gloss (Lead)
1080c (cone 04b)
130c per hour up to 1080c