cambriapottery Posted May 27, 2019 Report Share Posted May 27, 2019 I have alumina oxide but recipe calls for alumina hydrate. Can I use this to substitute? Link to comment Share on other sites More sharing options...
Bill Kielb Posted May 27, 2019 Report Share Posted May 27, 2019 Generally the answer would be no. Alumina oxide is difficult at best to evenly disperse and keep as such in your recipe. Sourcing alumina oxide from clay and feldspars is the preferred way. Rarely if ever will the use of alumina oxide work in a repeatable fashion. Alumina Hydrate however is used on occasion as a source and will disperse better. Hydrates of alumina contain varying amounts of water so figuring out the concentration required as it relates to the product you have is something to be aware of. Link to comment Share on other sites More sharing options...
Min Posted May 27, 2019 Report Share Posted May 27, 2019 If you are making kiln wash then either would be fine. Alumina hydrate contains approx 30% water so if the recipe is for kiln wash you could cut back on the oxide. Link to comment Share on other sites More sharing options...
Bill Kielb Posted May 27, 2019 Report Share Posted May 27, 2019 Min is right, I was assuming this is a glaze recipe so if not, wadding / wash very common even the proportions in wadding and wash are far less critical than a glaze. Link to comment Share on other sites More sharing options...
Benzine Posted May 30, 2019 Report Share Posted May 30, 2019 Not to hijack this thread, but I thought I'd just ask this here, instead of making a whole new topic, for a relatively simple question. Can I add Alumina Hydrate to a simple, commercially made kiln wash? I've got quite a bit of old, dried wash, in my classroom that I'd like to use up, instead of just tossing. I'm fairly certain that it is all just kaolin, with nothing else. Link to comment Share on other sites More sharing options...
Mark C. Posted May 30, 2019 Report Share Posted May 30, 2019 Yes you could-the only down side to commecial wash is usually they add a binder (sticks to shelves) and that is bad news. I have always just tossed the stuff that folks give me. Since alumina is costly I would test a small amont 1st Link to comment Share on other sites More sharing options...
cambriapottery Posted June 5, 2019 Author Report Share Posted June 5, 2019 This is a sacrifice glaze for naked Raku. But I also made a high alumina Shino glaze from John Britt's Highfire book Mino Shino using Alumina Oxide. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.