Pugaboo Posted June 24, 2017 Report Share Posted June 24, 2017 I have a recipe and it calls for Plastic Vitrox. Is there a substitute for this? GlazeNerd to the Rescue? RECIPE: PV BLUE Plastic Vitrox - 54% Gerstley Borate - 46% Add: Colbalt Barb - 3% Copper Carb - 1% If I have to special order the Plastic Vitrox I will but I am hoping I can substitute with the more common ingredients that I have already. Thanks! T Link to comment Share on other sites More sharing options...
glazenerd Posted June 24, 2017 Report Share Posted June 24, 2017 Oxide Analysis Formula CaO 1.00%. 0.143 MgO 0.50%. 0.100 K2O 5.00% 0.426 Na2O 0.90% 0.117 TiO2 0.10% 0.010 Al2O3 12.70% 1.000 SiO2 76.50% 10.223 Fe2O3 0.50% 0.025 LOI 2.80 This is the chemical analysis of PV clay. Run your recipe on a calculator, and sub out additions until you match it. Just at a glance; I see dolomite and Custer being two that would replace it. Link to comment Share on other sites More sharing options...
Min Posted June 24, 2017 Report Share Posted June 24, 2017 I wouldn't be using this for food surfaces. Have a look at the second chart, last column. Those are the suggested limits for a durable glaze, now have a look at the glaze levels of those, especially the boron. My version using common materials in the first pic. Link to comment Share on other sites More sharing options...
Pugaboo Posted June 24, 2017 Author Report Share Posted June 24, 2017 Thank you both! The boron limit is interesting and yes something to think about. Is there a free glaze calculator/ formulator out there? T Link to comment Share on other sites More sharing options...
glazenerd Posted June 24, 2017 Report Share Posted June 24, 2017 Pug: I assumed you aimed the question to me because it is called Plastic Vitrox clay. Another case where clay was applied to a mineral. Like EPK, "plastic" kaolin: it is anything but plastic. Type in glaze calculator, and free ones will pop up. Most use Insight. I use Glazemaster for several reasons: I can change how I view recipes to ten different settings. It has formula limits from Ron and John built in. It has a clay formulation module; which I can program with my own clay formula limits. Being able to write my own formula limits is crucial to my clay studies. Link to comment Share on other sites More sharing options...
oldlady Posted June 25, 2017 Report Share Posted June 25, 2017 terry, i assume you asked about some recipe left by the last person in charge and that his recipe called for plastic vitrox and you do not have any. if that is what is happening, you just want something to replace it, right? or perhaps a recipe for a glaze that has a similar color to make the students happy. can you send a picture of the glaze in question? someone may have a suggestion for a substitute that will be better all around. Link to comment Share on other sites More sharing options...
neilestrick Posted June 26, 2017 Report Share Posted June 26, 2017 My general rule of thumb: If a glaze only has two ingredients, it's probably not a very good glaze. The only exceptions I have found are slip glazes, or the basic low fire clear that's just frit and clay. Link to comment Share on other sites More sharing options...
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