Cone 4 is the standard heat level for bisque firing porcelain. It ensures uniform firing and prepares clay for glazing. Other cones are for different firing stages.
LIST I | LIST II | ||
---|---|---|---|
A | Cones | I | White |
B | Green ware | II | Blue |
C | Cobalt Oxide | III | Bend under heat |
D | Porcelain | IV | Bisque-fired |
LIST I | LIST II | ||
---|---|---|---|
A | Bisque firing | I | Second firing |
B | Glaze | II | First firing |
C | Pyrometric cones | III | Temperature measuring |
D | Pyrometer | IV | Pyramid shape |