What happens in the kiln

While Heating Up
Deg F Deg C What happens
70-212 20-100 Removing free water, risk for thermal shock
70-842 20-450 Slow warming, risk for thermal schock
176-482 80-250 Release of chemically bound water Slow warming, vent
662-842 350-450 Burning off organic materials like glue, fiber paper binder
Go slowly, vent the kiln,
842-986 450-530 Transition range. From brittle to viscous
Risk of thermal shock is over. Hereafter you may peek
1058-1094 570-590 Quarz inversion, involves volume change that causes stress to mold material Do not hurry past this stage
1110+ 600+ Risk of thermal shock really over. You may heat AFAP
1100 600 Heatwork begins and continues cumulatively past peak temperature
1076 580 Glass begins to slump slowly
1076-1200 580-650 For bubble release slow heating or soak 30 mins
1200-1240 650-670 Sand blasted surface gets a satin gloss
1076-1330 580-720 Slumping zone
1330-1364 720-740 Tack fusing
1310+ 710+ Plaster molds loose strength
1364-1436 740-780 Flame polishing
1436-1508 760-820 Full fuse
1364+ 740+ Devit risk
1400+ 760+ Maturing of Borax and SuperSpray
1454+ 790+ Bubbles under the glass expand rapidly
1508-1562 820-850 Relief casting of sheet glass
1508-1598 820-870 Frit casting, Pate de Verre
1562-1688 850-920 Pot melting, casting into deep mold
1742 950 Soft enough for combing
This is really hot! Remember protective clothing, no synthetics
Protect your eyes from infrared
Continues