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URL: 2019 Development of G3806 melt-fluid low-expansion clear base glaze

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https://insight-live.com/insight/share.php?z=gbcM8HXmX2

Related Information

Cone 6 Fluid-Melt Transparent Glaze - Jackpot!

A super gloss copper blue green glaze on a cast porcelain succulent plant pot

In 2015 I documented a project comparing common cone 6 fluid-melt base glazes, picked a favourite (Panama Blue) and over-hauled the recipe to fix it's slurry issues and serious crazing. While fluid-melts almost run off ware when applied thick, they host stains & opacifiers to produce brilliant super-gloss surfaces. But the typical chemistry of these is susceptible to crazing, scratching and leaching. In 2019 I reformulated again, moving the thermal expansion down from 7.3 to an incredible 5.8 (the base can now survive a 325F-to-icewater test on our toughest-to-fit porcelain with no crazing). And it is melt-fluidity-controllable, durable (having 30%+ more Al2O3/SiO2) and sources Li2O, MgO and KNaO from frits. Follow the link here to see the entire history of this development effort (beware, there are multiple pages, each with many columns).

Lemon Leaching Test on a Copper-containing Glaze

This was left for 24 hours. Wrapped in stretch wrap. Then the surface of the glaze was inspected under a lamp to detect any differences between the lemoned and non-lemoned surfaces. Lemons are highly acidic. This glaze passed because the base recipe, G3806N, was methodically developed so that it has plenty of Al2O3 and SiO2 (in the fired chemistry) to build a stable glass.

Links

Recipes G3806C - Cone 6 Clear Fluid-Melt Clear Base Glaze
A base fluid-melt glaze recipe developed by Tony Hansen. With colorant additions it forms reactive melts that variegate and run. It is more resistant to crazing than others.

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