Labelling According to Regulation (EC) No 1272/2008
This product is classified and labelled according to the CLP regulation
Hazard Statements:
None applicable.
Precautionary Statements
P261: Avoid breathing dust.
Maximum Firing Temperature: 1260°C
Composition: Ca, Cr, Si, Zr
Percentage Addition to Glaze: 10%
Opacifier: N/A
Not suitable for use in Zinc Glazes
Stoneware glaze must contain 6.7 - 8.4% CaO (12-15% CaCO3)
Stoneware Glaze
We recommend our GZ2136 as a suitable base transparent for this stain. This high-calcium glaze has been developed to produce the best colour response in pink, purple and mauve stains.
Firing Information
Firing temperatures can only be taken as a rough guide. Firing at 1200°C on a slow shecdule may give the equivalent maturing as firing to 1260°C on a fast schedule. The firing cycle, atmosphere, heat work and cooling rate will all affect the final result. As with all products we recommend testing before comitting to work.
Effects of Zinc
Zinc oxide influences the colour in a glaze more than any other element. Generally, zincless glazes should not conatin magnesium oxide. Some colours containing zinc are to be used in a zincless glaze. The zinc in the colour is in a combined form and will not harm the colour however free zinc oxide in the glaze can destroy the colour.
Calcium for Colour Development
Calcium oxide content as calcium carbonate (whiting) should be between 12-15% for best colour development. Adding the molecular equivalent of calcium oxide as wollastonite (a natural calcium silicate) often gives better uniformity. The increased silica from the wollastonite must be subtracted from the glaze or it will lead to a poor surface finish.
