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These two mugs are made from the same material: Ravenscrag Slip plus 20% Ferro Frit 3134. The one on the right has been bisque fired to 1550F. The one on the left has been clear glazed and fired to cone 03 (1950F). That means that this body vitrifies well below cone 03, likely well below cone 06. Thus strength, maturity, vitrification are not a matter of temperature, they are a matter of how much flux is available in the body to mature it to a dense, strong matrix.
Glossary |
Flux
Fluxes are the reason we can fire clay bodies and glazes in common kilns, they make glazes melt and bodies vitrify at lower temperatures. |
Glossary |
Vitrification
A process that happens in a kiln, the heat and atmosphere mature and develop the clay body until it reaches a density sufficient to impart the level of strength and durability required for the intended purpose. Most often this state is reached near zero p |
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