All Temperature Numbers Temperature Listing
It expands significantly between 1550 and 1600F and is melted by 1650. Through the entire heatup from 500F to 1600F it generates gases, totaling more than 20 percent.

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Gerstley Borate (compared 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.
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