What results from excessive RO2 glass-former oxides?

Unit 2 Topic 6
The Glaze Triangle
Too much acid molecules in a glaze will create a stiff, very white and densely opaque glass with a textured glossy surface.

These glazes are commonly called silica matts as SiO2 is the glass-former (acid) oxide present in all glazes.

Glazes overloaded with SiO2 can also be very stiff and stable. The suspended silica forms crystals producing harsh dry surfaces depending on the amount in excess.

Too much silica will also inhibit the melting of a glaze which will be very white and roughly textured like sandpaper.

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