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Gum Arabic

Alternate Names: Acacia Gum

Notes

Used to make glazes harden and adhere to the ware (where they have insufficient clay percentages in the batch). Normally only small amounts of gum are needed and they are put into the water before powder is added (typically a solution is prepared in hot water, then this added to the glaze batch before all its water has been added).

Do not underestimate the degree to which this can harden a glaze. If your glaze dries up in the bucket, for example, you may not be able to remix it if it contains a significant gum addition.

Since this is an organic gum it is subject to spoilage. It also has a distinct odor that is unpleasant to many people. Gum Arabic is also expensive compared to some substitutes.

Gum Tragacanth is another organic gum.

Related Information

Links

Oxide Analysis Formula
Typecodes Additive
Materials that are added to bodies and glazes to impart physical working properties and usually burn away during firing.
Typecodes Body Glaze binders, additives
URLs http://en.wikipedia.org/wiki/Gum_arabic
Gum Arabic at Wikipedia
Materials CMC Gum

By Tony Hansen

Monthly Tech-Tip from Tony Hansen

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