- A very active
flux similar in properties to K2O and Na2O.
- 1% addition
to a glaze increases the gloss and mechanical strength.
- 0.5% addition
to a glaze can increase fluidity and reduce pinholing.
- Starts fluxing
action at approximately 800 deg.C. Less volatile than soda over
1200 deg. C
- Useful secondary
flux for producing more alkaline lime and barium matts.
- Can replace
high expansion KNO to control crazing.
- Expense inhibits
wider and extensive use.
- Penetrates clay bodies very easily causing shivering in larger quantities.
petalite and spodumene are all lithium alumino silicates i.e.
they may be thought of as feldspars with KNO content replaced
with lithium oxide.
- Some of the
above are more refractory than others depending on the levels
of silica in the material.
- contains fluorine and phosphorous with lithium. Useful in opaque
glazes but needs oxidation.
- Lithium carbonate.
blues with copper and pinks with cobalt.