Gerstley Borate (with Ferro frit 3124) from 1600-1750F. At 1550F (not shown) it suddenly shrinks to a small ball and then by 1600F it has expanded to double its size. By 1650 it is well melted, but still gassing and bubbling.
|Temperatures||Gerstley Borate Melts Suddenly (1600F-1650F)|
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