This demonstrates the amazing melt behaviour of lead-as-a-flux for ceramic glazes. Not only does it melt early, but it softens slowly over a 300F range of temperatures before it goes off the end of the runway on this GLFL test. Then, when fired 200F hotter than that, it remains a stable and clear and uncrazed glass.
These were 10g balls melted using our GBMF test. Frit 3602 is lead bisilicate. But it got "smoked" by the Fusion FZ-16 high-zinc, high-boron zero-alumina! Maybe you always thought lead was the best melter. Produced the most transparent, crystal clear glass. But that is not what we see here.
|Materials||Ferro Frit 3602|
|Materials||Lead Bisilicate Frit|
Lead in Ceramic Glazes
Lead is a melter in ceramic glazes and performs exceptionally well. However recent findings show it to be even more environmentally pervasive and toxic at low levels than originally thought