Cone 4 #1 Quintessence

Custer feldspar 48
Gerstley borate 12
Frit 3134 12
Silica 12
Barium 8
EPK 5
Zinc oxide (calc.) 3
Total 100

Na2O 0.18 Al2O3 0.36 SiO2 3.16
K2O 0.19 B2O3 0.32 P2O5 0.00
MgO 0.04 TiO2 0.00
CaO 0.33 Fe2O3 0.00
ZnO 0.13
BaO 0.14

Alumina:Silica ratio is 1.00:8.90
Neutral:Acid ratio is 1.00:4.72
Alk:Neut:Acid ratio is 1.00:0.67:3.17

Expansion: 80.0 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3