Since the inception of PMC Sterling, it has had a 2 stage firing process as stated below:
Kiln Fire – 2 Stage:
1000°F / 538°C – 30 minutes (open shelf)
1500°F / 815°C – 30 minutes (activated carbon)
As confirmed by Tim McCreight, a Single Firing is also possible using the Water Method. This method fires at 1525˚F / 830°C for 30 minutes.Click here for instructions.