High Bridge Pottery Posted June 10, 2015 Report Share Posted June 10, 2015 Been testing with zinc oxide today, never really done much work with it before but I have used it in glazes. It really seems to gel up the glaze and help with suspension, I have been using it at about 10-20% of glaze so maybe that is why I have never seen much talk about it helping with suspension. It really has the consistency of plaster of paris that is only just beginning to set, these jelly like layers. Hard to explain. Anybody know this about zinc and use it because of that? It also seems to hold water and slow down glaze drying. That might help explain my white glaze that takes forever to dry. Link to comment Share on other sites More sharing options...
neilestrick Posted June 10, 2015 Report Share Posted June 10, 2015 10-20% zinc is a lot of zinc, and most likely well outside of limits unless you are trying for crystalline growth. From what I've read it can behave as you describe as far as suspension and holding water. Link to comment Share on other sites More sharing options...
High Bridge Pottery Posted June 10, 2015 Author Report Share Posted June 10, 2015 It was interesting to find out, I knew iron oxide could in large amounts but not zinc. Looking back at the values it's just above 10% in weight for the zinc and it really gels up. Trying to do a currie blend where I max out zinc and talc in a glaze so probably too much zinc in the main glaze. I do keep limits in mind but I like to overshoot. Link to comment Share on other sites More sharing options...
neilestrick Posted June 10, 2015 Report Share Posted June 10, 2015 Zinc oxide is typically used in small amounts, like 4% or less, but it can still work when overloaded. Link to comment Share on other sites More sharing options...
Min Posted June 10, 2015 Report Share Posted June 10, 2015 if you use a lot its great for making pinholes in glazes too Link to comment Share on other sites More sharing options...
Mark C. Posted June 10, 2015 Report Share Posted June 10, 2015 Factiod-it was used as a sun screen in the 50-60's mark Link to comment Share on other sites More sharing options...
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