cambriapottery Posted March 16, 2016 Report Share Posted March 16, 2016 Anyone got some info on ratio for changing from cadycal to gerstley borate in glaze recipe. Or can someone suggest an alternate to GB? Link to comment Share on other sites More sharing options...
glazenerd Posted March 16, 2016 Report Share Posted March 16, 2016 Gerstley Borate: 19.50% calcium Boron 26.80% Cadycal 25.70& calcium Boron 46.50% Do the math to compute the differences: but also need to factor one other issue: Gerstley Borate has 11.73% silica and Cadycal only has 0.73% silica: so have to compensate SiO2 changes. Alumina, Iron, Potassium and Sodium content is relatively close: will have no noticeable effects. Nerd Link to comment Share on other sites More sharing options...
neilestrick Posted March 16, 2016 Report Share Posted March 16, 2016 If you want a direct substitute use Gillespie borate. I have found that in some recipes the Gillespie is a bit stronger and should be reduced by about 3%. Link to comment Share on other sites More sharing options...
Min Posted March 16, 2016 Report Share Posted March 16, 2016 Using Insight glaze software it has Cadycal having about 1/3 more calcium than GB, far less magnesium, about twice the boron. GB has far more silica. If you post your recipe someone can likely re-do it with GB or Cadycal. Link to comment Share on other sites More sharing options...
cambriapottery Posted March 19, 2016 Author Report Share Posted March 19, 2016 Thanks for all the replies. I was researching for another potter so I have forwarded this info to her. Much appreciated. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.