To a potter, it may seem impossible that porcelain can be this dense and strong at such a low temperate. To achieve its very high plasticity and fired density this has 18% total shrinkage. Using this Zero4 fritware porcelain, very thin-walled pieces can be thrown. The frit also produces a higher expansion body that fits any low-temperature glaze we have tried. This is G1916QL3 ultra gloss clear glaze on Amaco Velvet underglazes. The low temperature has another benefit: Very sharp edges on painted underglaze designs. Zero4 replaces our old Zero3 porcelain.
The body is highly plastic and can be thrown very thin. At cone 04 this thin-walled mug did not warp even though it fired to a near-glasslike cross-section. The density and strength are amazing, it took about 30 hits with a hammer to break it, hitting it as hard as I dared without risking being cut with the handle I was holding it with. The whiter flecks are agglomerates of New Zealand kaolin (because of improper mixing of the slurry), later batches we made were much better.
The designation for a group recipes for body, glaze and engobe (by Tony Hansen), that potters can use to make low fire stoneware and fritware porcelain