Leadless High Borax/calcia for glaze
OXIDE | ANALYSIS | FORMULA |
---|---|---|
CaO | 11.20% | 0.67 |
K2O | 0.00% | 0.00 |
Na2O | 0.00% | 0.00 |
Al2O3 | 12.39% | 0.41 |
B2O3 | 22.99% | 1.12 |
SiO2 | 47.44% | 2.66 |
Co-efficient of Linear Expansion = 6.5
Melting Range = 920-950°C
Cone Range: 06-02
This frit is very high in boron and fluid. Not good for use in underglaze colors.
It is a complete cone 06-02 leadless glaze with the addition of a little kaolin to suspend. Add more kaolin in the upper ranges.
A chart from Ferro 1962 listed Na2O 10.3, B2O3 15.8.
Information from the Digitalfire Ceramic Materials Database