Bass #4 Transparent

Barium carbonate 7
Silica 18
EPK 7
Custer feldspar 56
Whiting 6
Zinc oxide 6
Total 100

Bentonite 2

Na2O 0.10 Al2O3 0.47 SiO2 3.85
K2O 0.23 P2O5 0.00
MgO 0.01 TiO2 0.00
CaO 0.25 Fe2O3 0.00
ZnO 0.28
BaO 0.13

Alumina:Silica ratio is 1.00:8.15
Neutral:Acid ratio is 1.00:8.17
Alk:Neut:Acid ratio is 1.00:0.47:3.86

Expansion: 76.0 x 10e-7 per degree C