A clay body is a blended clay recipe made for pottery, combining natural clays with materials such as feldspar, silica and grog so it throws or builds well and matures at a particular firing temperature.
What Is Clay Body?
Very few potters use clay straight from the ground. Suppliers blend clays like kaolin, ball clay and fire clay with fluxes, fillers and sometimes grog or colourants, to hit a target firing range, colour, shrinkage and workability. The result is called a body, and each one has a data sheet listing its cone, shrinkage and absorption.
Clay bodies fall into broad families: earthenware, stoneware, porcelain and specialist bodies such as bone china, paper clay and raku clay. Within each family, two bodies from different suppliers can behave quite differently, which is why potters test a new body before committing to it.
Choosing the right clay body for your kiln matters more than anything else. A body fired below its rated cone stays porous and weak, and one fired above it can bloat, slump or melt. Matching the body to your firing, your technique and your glazes is the first step to reliable results.
This pottery glossary entry from Le Studio Art Space is general educational content. Always follow the clay, glaze and kiln makers’ data for your own materials and equipment.