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Pearl Ash

Alternate Names: Potassium Carbonate, K2CO3, Pearlash

Oxide Analysis Formula
K2O 68.16% 1.00
CO2 31.84%n/a
Oxide Weight 94.20
Formula Weight 138.20

Notes

This is the only material in ceramics that can deliver K2O in the exact amount required without bringing other oxides with it, however, it is water-soluble. The most common source of K2O in glazes is feldspar and normally all the other oxides that feldspar supplies are also needed (so it is rare that pure and much more expensive pure K2O is needed). Sometimes this is used to modify the color in glazes.

In the manufacture of frits, pearl ash can be an important source of potassium.

Related Information

Links

URLs http://en.wikipedia.org/wiki/Potassium_carbonate
WikiPedia description
Materials Potassium Nitrate
Materials Potassium Carbonate Trihydrate
Materials Pearl Ash Calcined
Hazards Potassium Carbonate Toxicity
Typecodes Generic Material
Generic materials are those with no brand name. Normally they are theoretical, the chemistry portrays what a specimen would be if it had no contamination. Generic materials are helpful in educational situations where students need to study material theory (later they graduate to dealing with real world materials). They are also helpful where the chemistry of an actual material is not known. Often the accuracy of calculations is sufficient using generic materials.
Typecodes Flux Source
Materials that source Na2O, K2O, Li2O, CaO, MgO and other fluxes but are not feldspars or frits. Remember that materials can be flux sources but also perform many other roles. For example, talc is a flux in high temperature glazes, but a matting agent in low temperatures ones. It can also be a flux, a filler and an expansion increaser in bodies.
Glossary Water Solubility
The water solubility of ceramic materials is an important consideration to their usability in the process. Glazes are suspensions of insert powders, solubles present problems to this system.
Oxides K2O - Potassium Oxide

Data

Frit Softening Point 896C M
Density (Specific Gravity) 2.30
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