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This schedule slows down around the quartz inversion zone and holds both on the way in and out of each (up and down ramps).
This assumes a large piece that requires slow heatup and cooldown to prevent thermal gradients. If you are firing pieces that are thinner and lighter then steps 2, 4, 6 and 8 could likely be set to a faster rate.
Step | °C | °F | Hold | Time | |
---|---|---|---|---|---|
1 | 138°C/hr to 121C | 250°F/hr to 250F | 60min | 1:42 | |
2 | 111°C/hr to 518C | 200°F/hr to 965F | 30min | 5:46 | |
3 | 41°C/hr to 629C | 75°F/hr to 1165F | 30min | 8:56 | |
4 | 111°C/hr to 1148C | 200°F/hr to 2100F | 0 | 13:37 | |
5 | 55°C/hr to 1204C | 100°F/hr to 2200F | 15min | 14:52 | |
6 | 83°C/hr to 629C | 150°F/hr to 1165F | 30min | 22:16 | |
7 | 41°C/hr to 518C | 75°F/hr to 965F | 30min | 25:26 | |
8 | 83°C/hr to 121C | 150°F/hr to 250F | 30:12 |
Glossary |
Quartz Inversion
In ceramics, this refers to the sudden volume change in crystalline quartz particles experience as they pass up and down a temperature window centering on 573C. |
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