|Monthly Tech-Tip |
These were all made in our studio. All were dried evenly as possible and are awaiting firing. The tall white vase weighs 21kg, built in four pieces, using H550, by Toludare Toluwalope. The brown vase was made by Kat Valenzuela, it weighs 27kg and is made of H440. The torso was made by Grace Warren, it weighs 13kg and is made of H441G (it contains minimal grog of fine particle size). Another torso behind of similar weight is made of H440. Her other piece behind the front torso weighs 25kg and has varying thick and thin sections, it is made of Tapper clay (sold to the smelting industry). None of these pieces had any significant cracks during drying or firing.
Grog is a term used in ceramics to describe crushed brick (or other fired ceramic) aggregate that is added to sculpture and structural clays to improve drying properties.
Drying Ceramics Without Cracks
Anything ceramic ware can be dried if it is done slowly and evenly enough. To dry faster optimize the body recipe, ware cross section, drying process and develop a good test to rate drying performance.
Clay Cracking During Drying
The best way to avoid drying cracks when making ceramics or pottery is to avoid doing the things that cause it. Do not just blame the clay, anything can technically be dried.