Kilns & firing ovens

Kilns and firing ovens are machines that transform plastic and unfired materials — clay, ceramics, vitreous glazes — into hardened and vitrified artefacts through the application of controlled heat at temperatures typically ranging from 800 °C (earthenware) to 1,300 °C (porcelain). The firing triggers irreversible physicochemical reactions: evaporation of residual water, combustion of organic binders, sintering of clay particles and, for glazes, melting and cooling into a continuous glassy layer.

The thermal profile — heating curve, peak temperature, hold time and cooling rate — is the critical parameter: incorrect curves cause cracking, distortion or defective vitrification. Electric muffle kilns are the most widespread in the maker and hobby ceramics context for the precision of their control; gas or wood-fired kilns (raku, anagama) offer atmospheric effects impossible with an electric kiln. Small kilns of 10–80 litres allow single- or two-stage firing (bisque + glaze).