High Fire Ceramics (Cone 9-10 )
High-Fire Ceramics start around cone 8 and go as high as cone 13 and even higher. The standard range is cone 9-10. The majority of your more common stoneware and porcelain clays are rated to cone 10 and are made popular by both production potters and ceramics sculptors.
Cone 10 refers the traditional high-fire ceramic range. Ceramic artists have used this number (2350 F) to fire stonewares and porcelains for the past few centuries. Recent research shows that most affects achieved at Cone 10 temperatures can be achieved at Cone 6 or mid-range temperatures with a few chemical adjustments and a lot less fuel. There are still many who feel that Cone 10 is still the ultimate temperature range for full vitrification of their clays and ultimate results. Typically crystalline and woodfire potters will still fire in this range or sometimes even hotter. The ceramic process necessary for these two specific styles requires longer, hotter firings for the desired reactions to occur. Common examples of cone 10 ceramics include german salt fired stonewares, japanese woodfired ceramics and the majority of contemporary porcelain. Crystalline Glazing is probably the most popular electric high-fire application, otherwise it is considered to be a waste in electric kilns.
The high-fire cycle is similar to the mid-range cycle with a bisque firing from anywhere between cone 012 to cone 04 and then a glaze or end-firing in the ranges mentioned above (Typically cone 9-10) High-fire ceramics are achieved using any number of different firing techniques including wood firing, salt firing, soda firing, gas firing etc.