Cone 4 #28 Glacée/Blanc Opaque

Frit 3134 10
Gerstley borate 10
Barium carbonate 7
Custer feldspar 43
Silica 24
EPK 1
Whiting 2
Zinc oxide 3
Total 100

Na2O 0.16 Al2O3 0.29 SiO2 3.68
K2O 0.17 B2O3 0.28 P2O5 0.00
MgO 0.03 TiO2 0.00
CaO 0.36 Fe2O3 0.00
ZnO 0.14
BaO 0.13

Alumina:Silica ratio is 1.00:12.78
Neutral:Acid ratio is 1.00:6.51
Alk:Neut:Acid ratio is 1.00:0.57:3.69

Expansion: 75.2 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3