Cone 7 slip casting clay

Hensley/P olseno cone 7 casting slip (from Andrew Martin’s book)

18 EPK
25 OM#4 ball clay (or SPG which is coarser-particle clay and casts more quickly)
5 Tile-6 Kaolin
35 Nepheline Syenite
9 Custer Feldspar
1 3110 Frit
7 Silica
100%

Water 42
Sodium Silicate 0.25-0.5%