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Gum Arabic

Alternate Names: Acacia Gum

Description: GLAZE BINDER, HARDENER

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 Additives for Ceramic Glazes
Materials that are added to glazes to impart physical working properties and usually burn away during firing. In industry all glazes, inks and engobes have additives, they are considered essential to control of cohesion, adhesion, suspension, dry hardness, surface leveling, rheology, speed-of-drying, etc. Among potters, it is common for glazes to have zero additives.
Typecodes Additives for Ceramic Bodies
Materials that are added to bodies to impart physical working properties and usually burn away during firing. Binders enable bodies with very low or zero clay content to have plasticity and dry hardness, they can give powders flow properties during pressing and impart rheological properties to clay slurries. Among potters however, it is common for bodies to have zero additives.
URLs http://en.wikipedia.org/wiki/Gum_arabic
Gum Arabic at Wikipedia
Materials CMC Gum
CMC gum is indispensable for many types of ceramic glazes. It is a glue and is mainly used to slow drying and improve adhesion and dry hardness.
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