| 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 |