Silica 6
Frit 3134 35
EPK 15
Custer feldspar 36
Whiting 4
Zinc oxide 4
Total 100
Na2O 0.23 Al2O3 0.35 SiO2 2.71
K2O 0.12 B2O3 0.35 P2O5 0.00
MgO 0.00 TiO2 0.00
CaO 0.50 Fe2O3 0.00
ZnO 0.15
Alumina:Silica ratio is 1.00:7.70
Neutral:Acid ratio is 1.00:3.87
Alk:Neut:Acid ratio is 1.00:0.70:2.71
Expansion: 80.7 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3
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