Glaze Course - Lesson Summaries
Oxide Limits
Lesson Number 9
Since the late 19th century ceramic researchers such as Hermann Seger have been driven by a need to provide guidelines for glaze makers particularly in industry. Their concern has been to establish the parameters within which glaze makers could design glazes that could be described as 'good glass' i.e. glazes that are fully melted (balanced), are hard (scratch resistant) and are 'stable' i.e. do not release (leach) colourant or non-colourant oxides.

The results of their testing programmes have been recorded in various 'limit tables' which list an upper and lower molecular equivalent for the oxides commonly found in glaze over a range of temperatures.

This unit looks at the construction, and value of these tables then goes on to discuss how, with the help of glaze software, they can be used to assist in the design, assessment and manipulation of glazes.

The image is of Hermann August Seger (1839-1893).

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Contact: Lawrence Ewing - 1015 Ellis Rd, Five Rivers, RD3, Lumsden, Northern Southland,
New Zealand