Grog, also known as firesand and chamotte, is a raw material for making ceramics. It has a high percentage of silica and alumina. It is normally available as a powder or chippings, and is an important ingredient in Coade stone.

What is chamotte English?

Noun. chamotte (countable and uncountable, plural chamottes) A ceramic raw material with a high percentage of silica and alumina. Synonyms: firesand, grog.

Why use Grogged clay?

Grog can come in many particle sizes, from fine to coarse. It is used to reduce shrinkage in clay bodies. ... For hand building, grog in a clay body reduces the shrinkage and makes it less likely that a piece will crack during drying and firing.