Amazing Pottery

clay pottery takes how long to be fired over an open flame?

Public Comments

1. depends on the size and thickness of the piece
2. It is normally never fired over an open flame because the sudden application of high heat will crack it - the flames heat is directed around muffle walls, etc. to raise the heat of an enclosed space (the kiln) gradually. Orton Cones for measuring pottery firing and they assume that a certain amount of time is involved in the heating - so a heating rate http://www.ortonceramic.com/pyro metrics/arts/cones.shtml [URL divided because of Ansers bug, copy and paste to follow] http://www.ortonceramic.com/resou rces/reference/effect_heat.shtml