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Cone 6

This refers to the medium temperature range (or middle fire) that most potter's work in. Orton cone 6. About 2200F or 1200C. The term "cone 6" normally implies oxidation firing in a hobby kiln (most fire to this range). Clays made using feldspar can be made to vitrify to zero-porosity density at cone 6 (including porcelains and stonewares). Since vitreous ware can be made at cone 6, most people do not bother with the extra time, trouble and expense of firing to higher temperatures. Companies making prepared glazes serve the middle temperature range with a wide array of products.

Related Information

Links

Glossary Medium Temperature Glaze
These are stoneware glazes that fire in the range of 1200C (2200F). They often contain boron to assist with melting.
Glossary Low Temperature Glaze Recipes
In ceramics, glazes are loosely classified as low, medium and high temperature. Low temperature is in the cone 06-2 range (about 1800F-2000F).
Articles Glaze Recipes: Formulate Your Own Instead
The only way you will ever get the glaze you really need is to formulate your own. The longer you stay on the glaze recipe treadmill the more time you waste.
Articles Electric Hobby Kilns: What You Need to Know
Electric hobby kilns are certainly not up to the quality and capability of small industrial electric kilns, but if you are aware of the limitations and take precautions they are workable.
Recipes G2926B - Cone 6 Whiteware/Porcelain Transparent Base Glaze
A base transparent glaze recipe created by Tony Hansen for Plainsman Clays, it fires high gloss and ultra clear with low melt mobility.
Recipes G2934 - Matte Glaze Base for Cone 6
A base MgO matte glaze recipe fires to a hard utilitarian surface and has very good working properties. Blend in the glossy if it is too matte.
Recipes G2934Y - Cone 6 Magnesia Matte Low LOI Version
The same chemistry as the widely used G2934 but the MgO is sourced from a frit and talc instead of dolomite. It has a finer surface, less cutlery marking and staining.

By Tony Hansen

Monthly Tech-Tip from Tony Hansen

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