Are you making cabochons (smallish round glass "stones" or blobs)? If so, your glass is getting too much heatwork for the size. The cycle can be much simpler.
For US readers, I converted your cycle to Fahrenheit and it looks like this:
360°F per hour - 1000°F hold for 10mins
450°F per hour - 1225°F hold 30mins
AFAP - 1480°F hold 40 mins
AFAP - 900°F hold 1hr
120°F per hour - 700°F no hold
Try a single ramp:
200°C per hour - 760°C. Hold for 5 minutes. Take a quick look. If they look ready, shut off the kiln, close the door, and wait for them to cool to room temperature.
If they don't look ready, hold for 5 more minutes OR crank up the heat another 5-10°C. Then shut off the kiln.
I think this shorter cycle will reduce any sticking, and should work fine for cabochons up to 3 cm in diameter.
Mary Kay Nitchie
Bullseye Glass Co.
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