Cone 4 #6 Texturée

EPK 20
Kaolin (Calc.) 20
Frit 3134 30
Gerstley borate 30
Total 100

Na2O 0.22 Al2O3 0.46 SiO2 1.82
K2O 0.01 B2O3 0.68 P2O5 0.00
MgO 0.08 TiO2 0.01
CaO 0.69 Fe2O3 0.01

Alumina:Silica ratio is 1.00:3.93
Neutral:Acid ratio is 1.00:1.60
Alk:Neut:Acid ratio is 1.00:1.14:1.83

Expansion: 75.8 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3