Cone 4 #14 Transparente

Frit 3134 21
Gerstley borate 21
EPK 13
Kaolin (Calc.) 10
Silica 35
Total 100

Na2O 0.22 Al2O3 0.38 SiO2 4.17
K2O 0.01 B2O3 0.69 P2O5 0.00
MgO 0.08 TiO2 0.00
CaO 0.69 Fe2O3 0.01

Alumina:Silica ratio is 1.00:10.98
Neutral:Acid ratio is 1.00:3.92
Alk:Neut:Acid ratio is 1.00:1.07:4.18

Expansion: 61.3 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3