Before revision: This mix is usually fired once at 1200-1300 °C for most applications, and twice fired for use in crockery with a first firing at 900-950 °C and a second firing at 1200-1250 °C.
After revision: This mix is usually fired once at 1200–1300 °C for most applications, and twice fired for use in crockery with a first firing at 900-950 °C and a second firing at 1200-1250 °C.