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High Temperature Glaze

In functional ceramics this term generally refers to glazes that mature at cone 8 and higher. At these temperatures natural minerals like feldspar, calcium carbonate, etc can be compounded to create glazes that will melt well without the need for powerful (and troublesome fluxes) like zinc oxide, boron or lead. Materials like Albany slip will melt unassisted to produce beautiful glossy glazes. In addition, high temperatures mean that less high expansion fluxes are needed and so it is much easier to create glazes that do not craze.

Out Bound Links

  • (Glossary) Crazing

    Crazing refers to small hairline cracks in glazed surfaces that usually appear after firing but can appear years later. It is caused by a mismatch in the thermal expansions of glaze and body. Most ceramics expand slightly on heating and contract on cooling. Even though the amount of change is very s...

  • (Articles) Reducing the Firing Temperature of a Glaze From Cone 10 to 6

    Moving a cone 10 high temperature glaze down to cone 5-6 can require major surgery on the recipe or the transplantation of the color and surface mechanisms into a similar cone 6 base glaze.

In Bound Links

  • (Typecodes) 3: HTR - High Temperature (Cone 10) Glaze Recipes
  • (Glossary) Borosilicate

    A silicate is an SiO2-centric solid (crystalline or glass). A borosilicate simply is a silicate with boron. The term 'borosilicate' is synonymous with medium and low fire glazes because boron is not employed at high temperatures (CaO, Na2O, MgO, etc flux silica and bond with it to form crystalline o...

  • (Glossary) Stoneware

    Most often the term "stoneware" refers to a high fired (about 1200C+) ceramic clay:feldspar:quartz blend that is semi-vitreous (not translucent and not zero porosity). To appreciate the scope that stoneware can encompass it is helpful to contrast it with porcelains (this description is for people wh...

  • (Videos) Reducing the Firing Temperature of a Glaze From Cone 10 to 6

    A key lesson because it explains the difference between cone 10 and 6 glazes, demonstrates how to evaluate frits to choose the best one to source boron to a glaze, how to determine how much frit to ad...

By Tony Hansen

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