Ceramic

Wedging

A method of de-airing and dispersing moisture uniformly by hand in a piece of clay. The lump of clay is repeatedly thrown hard onto the work bench, turned over and occasionally cut through and re-joined.

Ceramic

Vitrification of ceramic

The progressive fusion of a material or body during the firing process. As vitrification proceeds the proportion of glassy bond increases and the apparent porosity of the fired product becomes progressively lower.

Ceramic

Throwing

The technique of forming pottery on the potter’s wheel. A ball of prepared clay is thrown on the wheel and it is centred and shaped with the hands.

Ceramic

Thermocouple

A device for the measurement of temperature based on the voltage generated when two dissimilar conductors are heated in contact e.g. copper/constantan, chrome/alumel, platinum/rhodium, etc.

Ceramic

Thermal Shock

Thermal shock is the way in which some materials are prone to damage by stresses set up due to differences in temperature in different parts of the article.

Ceramic

Tenmoko

A stoneware glaze deeply coloured by iron oxide. It produces often lustrous results that vary in colour from yellow, green, rust red, brown and black.

Ceramic

Stoneware

A ceramic body containing a naturally vitrifying clay e.g. a stoneware clay or a suitable ball clay. Sometimes a non-plastic constituent and a flux are added. See clay chart for vitrification temperatures.