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 A sodium-calcium-borate compound used as a low and mid-range glaze flux. This is a conglomerate mineral made up primarily of Colemanite, Ulexite and Hectorite.
Product Details
Note: Sold in 5 lb. increments; Sold in 50 lb. increments for orders 50 lbs. or more.
Priced by the pound. A sodium-calcium-borate compound used as a low and mid-range glaze flux. This is a conglomerate mineral made up primarily of Colemanite, Ulexite and Hectorite.
| Typical analysis: |
| B2O3 |
26.80% |
| CaO |
19.40% |
| SiO2 |
14.80% |
| NaO2 |
3.95% |
| MgO |
3.54% |
| Al2O3 |
0.98% |
| Fe2O3-T |
0.425% |
| K2O |
0.399% |
| P2O5 |
0.053% |
| TiO2 |
0.05% |
| MnO |
0.024% |
| Trace minerals |
0.079% |
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| LOI |
29.50% |
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This material is partially soluble and can flocculate glaze slops. It can help prevent crazing when used in small amounts, and can act somewhat as an opacifier in larger amounts, giving glazes a milky appearance. A standard substitute in glazes calling for Colemanite.
**Note: For large or heavy orders that weigh 150 lbs. or more, we will advise you of the approximate freight cost. You will not be charged until we verify shipping costs with you.**
 View Gerstley Blend SDS Sheet
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