Firing Time Chart


Temperature Range Rate of °F. per Hour Number of Hours
70 – 400°F 50 – 80 4 – 6
400 – 1200 °F 150 5 1/2
1200 – 1900°F 200 4
     
Total Heating Time   12 – 18 hours
Total Cooling Time   12 – 18 hours

NOTE:

  • Heating should be slow up to 400°F.
  • After Red Heat, it’s OK to heat at 200 degrees per hour.
  • A kiln should take about as long to cool as it did to heat, because similar chemical and changes take place as the temperature drops.