That's a great picture. The clay-for-high-temp stuff I've done (pourable refractory, mandrel bead separation mud) I've heated until it steamed, left it at that heat until it stopped steaming, then gone up to red. It's spalled if I get heavy with the heat while it's still steaming.
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The clay-for-high-temp stuff I've done (pourable refractory, mandrel bead separation mud) I've heated until it steamed, left it at that heat until it stopped steaming, then gone up to red. It's spalled if I get heavy with the heat while it's still steaming.