Low Expansion Glossy Clear Cone 6| Code | G1215U |
| Modification Date | 2011-07-27 12:36:37 |
Recipe| Material | Amount | Units | +/- | *Stat |
| EPK | 14.00 | g | | |
| Silica | 26.00 | g | | |
| Wollastonite | 14.50 | g | | |
| F-4 Feldspar | 24.00 | g | | |
| Frit 3249 | 20.00 | g | | |
| | 98.50 | |
Firing Schedule
| Rate (C) | Temp (C) | Hold (Min) | Step | | 55 | 104 | 120 | 1 | | 167 | 482 | 0 | 2 | | 83 | 593 | 0 | 3 | | 167 | 945 | 0 | 4 | | 60 | 1185 | 20 | 5 | | 278 | 1035 | 0 | 6 | | 83 | 816 | 0 | 7 |
NotesSee the article link for more information.
This glaze introduces MgO (from a special frit) at the expense of CaO to reduce the thermal expansion of the 20x5 and 1215W recipes to work better of porcelains (the others crazes). The result is a crystal clear very nice transparent glaze. However, keep in mind that you cannot expect one glaze to work well on both porcelain and stonewares. If you were to use this glaze on the insides of stoneware mugs, for example, its low thermal expansion may put it under compression and therefore weaken the mugs resistance to cracking when exposed to sudden increases in temperature.
3-45
Out Bound Links
In Bound Links
Pictures
1215U flow test, MgO is sourced from Talc (right) and from a much more actively melting MgO frit (left).
1215U glazes with various Mason stains
G1215U vs. G1215W glaze flow test
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