Whiting 20
Custer feldspar 30
Ball clay 20
Silica 30
Total 100
Rutile 0.5
Copper carbonate 5.5
Na2O 0.05 Al2O3 0.35 SiO2 3.47
K2O 0.12 TiO2 0.03
MgO 0.01 Fe2O3 0.01
CaO 0.68
CuO 0.15
Alumina:Silica ratio is 1.00:9.85
Neutral:Acid ratio is 1.00:9.96
Alk:Neut:Acid ratio is 1.00:0.35:3.51
Expansion: 68.5 x 10e-7 per degree C
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