Colemanite Glaze #4 Gloss/Transparent

Custer feldspar 48
Colemanite 23
Silica 11.5
Barium carbonate 9
EPK 5
Zinc oxide (Calc.) 3.5
Total 100

Bentonite 1

Na2O 0.08 Al2O3 0.36 SiO2 2.82
K2O 0.19 B2O3 0.60 P2O5 0.00
MgO 0.00 TiO2 0.00
CaO 0.41 Fe2O3 0.00
ZnO 0.15
BaO 0.16

Alumina:Silica ratio is 1.00:7.76
Neutral:Acid ratio is 1.00:2.94
Alk:Neut:Acid ratio is 1.00:0.96:2.83

Expansion: 76.1 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3