Cone 4 #4 Quintessence Bristol

Custer feldspar 62
Zinc oxide (Calc.) 16
EPK 9
Whiting 9
Silica 4

Bentonite 2

Na2O 0.08 Al2O3 0.36 SiO2 2.22
K2O 0.17 P2O5 0.00
MgO 0.00 TiO2 0.00
CaO 0.24 Fe2O3 0.00
ZnO 0.50

Alumina:Silica ratio is 1.00:6.10
Neutral:Acid ratio is 1.00:6.12
Alk:Neut:Acid ratio is 1.00:0.36:2.23

Expansion: 82.0 x 10e-7 per degree C