Fusing Glass Catalogue Final - Flipbook - Page 30
Wissmach Glass Firing Suggestions
Segment or Step Rate (DPH)*
(Speed)
Process
Temperature
Soak or
Hold in
Reasoning
Do not ask HOW, ask WHY and bypass generic firing
(Destination)
Minutes
Schedules!
1
Initial Heat Cycle
600°F
222°C
1000°F
538°C
:10
Be efficient and heat uniformly to avoid thermal
shock
2
Pre-Rapid Heat
AFAP***
1210°F
651°C
:15
You can skip this segment if you do not have any
Bubble or Mold concerns
3
Rapid Heat to
Process Temp.
AFAP***
1410°F **
765°C **
:12
Going up fast will avoid devitrification and increases
efficiency. Choose the right Process Temperature
and soak time and avoid over firing
4
Rapid Cool to
Anneal Soak
AFAP***
900°F
482°C
:45
Equalize the temperature in the mass of glass and
mold. Adjust hold time for size and thickness of glass.
5
Anneal Cool
100°F
38°C
700°F
371°C
:1
The actual annealing is happening by cooling slowly
through this annealing range.
6
Final Cool Down
* DPH = degrees per hour
90°F
32°C
Leave the kiln closed to avoid thermal shock.
** Process temperature - please adjust to your kiln and to your desired effect.
***AFAP = as fast as possible - See if your digital controller has a
