|Monthly Tech-Tip |
The NZK body, Polar Ice, is on the left. The Grolleg one, L3778D, is on the right. They are not the same recipe, the feldspar content in the L3778D has been adjusted to match the degree of vitrification (Grolleg contains some feldspar). Clearly, the NZK has better translucency. And it fires whiter.
Material substitutions in ceramic glaze and body recipes must consider their chemistry, mineralogy and physical properties
A white burning kaolin from the UK, commonly used in porcelain bodies and as a glaze suspender. Sticky when wet, low plasticity.
New Zealand Halloysite
The whitest burning kaolin we have ever seen. It is very sticky when wet, suspends glazes well & makes super white porcelain (with help from a white bentonite).