Tony Hansen 20x5 is a classic cone 6 glaze.
Tony Hansen will tell you all about this glaze on his website DigitalFire.com
Here is a link to UMF info and charts on Glazy.com
% Hansen 20x5
20 Custer Feldspar
20 Frit 3134
Mixed to Specific Gravity of 1.45
Floccing not necessary