We use different refractory clays, all made in France. There are 2 clays bases : basic and semi-acidic clays. The choice of clay to make a pot depends on the type of melting pot, its size and glass composition it will receive. In order to best serve you, we can answer to any questions, and on your request, we provide tempering and firing curves. These clays are ready to use, in 13 kg loaves, and available for sale on request.