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Alkali

Alkalies are the strong base fluxing oxides of Na2O, K2O and Li2O. Feldspars are by far the most common alkali sourcing materials, thus the term 'alkali feldspars'. However, frits are also an excellent source and sometimes the only alternative to meet the chemistry requirements (e.g. low alumina and high Na2O). Glazes high in these oxides generally are glossy and bright and have high thermal expansions.

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Glossary Alkaline Earths
Refers to a group of ceramic fluxing oxides that contribute similar properties to fired glazes. They contrast with the alkalis which are stronger fluxes.
Oxides K2O - Potassium Oxide
Oxides Na2O - Sodium Oxide, Soda
By Tony Hansen
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