G2926B Transparent Cone 6 Glaze
For Whitewares, Porcelains
Intended for use on M370. It has the lower thermal expansion necessary to fit (without crazing). It sources boron from a frit instead of troublesome Gerstley Borate (you need to see and use this side-by-side with a Gerstley Borate based glaze to appreciate how much better this is). This recipe has good suspension and very good application properties if it is the correct consistency (in our studio about 1.45 specific gravity, which is about 45% water or 2.04 kg of water for each 2.5 kg bag of premixed glaze). If the specific gravity is too high it may settle out.
Compatibility with stains is shown on this sample board. It does not work as well as the M340 Transparent for chrome-tin stains.
Underglazes with M370 and G2926B transparent. The colors were airbrushed and the clear glaze was sprayed over top.
To prepare the transparent glaze for use, adjust the amount of water so you have a specific gravity of 1.45 (see link below). Then add vinegar (if needed) to gel it. You can tell if it is gelled by stirring and then stopping and watching it. It should continue moving for a few seconds, then stop and bounce back slightly (that bounce back is called the thixotropy). For a gallon of glaze it might take 5 cap fulls of vinegar, but stir after each one to see if there is an effect (be careful not to put too much). When it is right you will be able to dip a piece for 1-2 seconds, withdraw it and get an even layer without dripping. Adjust your bisque temperature to get more porosity (if the glaze dries to slow) or less (if it dries too fast).
Still getting crazing, perhaps on P300? Check G3838A.
Screening: We have not ball milled this product, thus it will contain some oversize particles from the constituent materials. We advise that you screen your glaze slurry to at least 80 mesh when you make the glaze and periodically after that.
The recipe of this glaze is not proprietary. We developed it and sell it premixed but if you want to batch it yourself, please feel free to do so. For more detailed information at the Digitalfire Reference Library (e.g. the recipe, mixing your own, more pictures) click here. The mechanism of the recipe is explained, this may empower you to adjust it to you needs.
Safety Data SheetClick here for web view (format adheres to Globally Harmonized System of Classification and Labelling of Chemicals - GHS)
|Plainsman Clays Ltd.|
702 Wood Street, Medicine Hat, Alberta T1A 1E9
Phone: 403-527-8535 FAX:403-527-7508