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The GBMF test compares Custer Feldspar with 15% Frit 3110 and 15% Ferro Frit 3134. It is fired at cone 6.
| Materials | Ferro Frit 3110 High sodium, high thermal expansion low boron frit. A super-feldspar in clay bodies. Melts a very low temperatures. | 
| Materials | Ferro Frit 3134 A frit with 23% B2O3. The most common of frits used in pottery in North America. Around the world, other companies make frits of equivalent chemistry. | 
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