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G1215U is a recipe having a significant amount of the super low expansion Ferro frit 3279. The result is an ultra-clear glaze that will fit pretty well any clay body without crazing. The mechanism is a high level of MgO, that means it responds differently to stains.
| Articles | Bringing Out the Big Guns in Craze Control: MgO (G1215U) MgO is the secret weapon of craze control. If your application can tolerate it you can create a cone 6 glaze of very low thermal expansion that is very resistant to crazing. | 
| Recipes | G1215U - Low Expansion Glossy Clear Cone 6 A recipe sourcing high MgO (from Ferro Frit 3249) to produce a low expansion glass resistant to crazing on lower silica porcelains. | 
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