200dph, I choose to ramp up slowly, because of the uneven surface, thinking to give the glass enough time to heat up evenly. I will ramp up to 1210 degrees, here again the process temperature I read, is not so important but the hold time is. I choose to hold for 45 minutes at process temperature. Then from there all is the same. It ramps down to 900 degrees as fast as possible. Hold 1 hour. Then 100 slowly dph until it goes to 700 degrees and then full power until room temperature.
200dph.......................1210 degrees...........................hold 45 min
Full..............................900 degrees..............hold 1 hour
100 dph......................................700 degrees............hold 0
Full ...........................................70 degrees...................off
So, I will be looking to see whether or not the glass breaks and whether or not it slumps correctly. It worked, here are the results.
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