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03DSFF - Cone 03 Fast Fire
04DSDH - Low Temperature Drop-and-Hold
BQ1000 - Plainsman Electric Bisque Firing Schedule
BRTF05 - Bartlett Fast Glaze Cone 05
BRTF6 - Bartlett Fast Glaze Cone 6
BRTS6 - Bartlett Slow Glaze Cone 6
BTFB04 - Bartlett Fast Bisque Cone 04
BTSB04 - Bartlett Slow Bisque Cone 04
BTSG05 - Bartlett Slow Glaze Cone 05
C04PLTP - Plainsman Low Temperature Drop-and-hold
C10RPL - Plainsman Cone 10R Firing
C5DHSC - Plainsman Cone 5 Drop-and-Hold Slow-Cool
C6DHSC - Plainsman Cone 6 Slow Cool
C6IRED - Cone 6 Iron Reds
C6MSGL1 - Mastering Glazes Cone 6
C6PLST - Plainsman Cone 6 Electric Standard
FSCG1 - Shimbo Crystal Schedule 1
FSCGB1 - Shimbo Crystal Holding Pattern 2
FSCGCL - Shimbo Crystal Celestite Schedule
FSCGWM - Wollast-O-Matte Fara Shimbo Crystalline Glaze
FSCRGL - GC106 Base for Crystalline Glazes
FSHP1 - Shimbo Crystal Holding Pattern 1
FSHP3 - Shimbo Crystal Holding Pattern 3
FSNM5 - Fa's Number Five
MDDCL - Medalta Decal Firing
PLC6CR - Cone 6 Crystal Glaze Plainsman
PLC6DS - Cone 6 Drop-and-Soak Firing Schedule
QICA - Quartz Inversion Cracking Avoider

"QICA" Firing Schedule

Quartz Inversion Cracking Avoider

This schedule slows down around the quartz inversion zone and holds both on the way in and out of each (up and down ramps).

This assumes a large piece that requires slow heatup and cooldown to prevent thermal gradients. If you are firing pieces that are thinner and lighter then steps 2, 4, 6 and 8 could likely be set to a faster rate.

Step °C °F Hold Time
1 138°C/hr to 121C  250°F/hr to 250F  60min 1:42  
2 111°C/hr to 518C  200°F/hr to 965F  30min 5:46  
3 41°C/hr to 629C  75°F/hr to 1165F  30min 8:56  
4 111°C/hr to 1148C  200°F/hr to 2100F  0 13:37  
5 55°C/hr to 1204C  100°F/hr to 2200F  15min 14:52  
6 83°C/hr to 629C  150°F/hr to 1165F  30min 22:16  
7 41°C/hr to 518C  75°F/hr to 965F  30min 25:26  
8 83°C/hr to 121C  150°F/hr to 250F    30:12  
Start temperature assumed: 25°C or 75°F
"Fahrenheit degrees" is not the same as "degrees Fahrenheit". A 100° reading on a Fahrenheit thermometer is equal to a 37° reading on a Celcius thermometer. But "100 Fahrenheit degrees of temperature change" is equivalent "55 Celsius degrees of change". That is an important distinction to understand the above temperature conversions.

Related Information


Glossary Quartz Inversion
In ceramics, this refers to the sudden volume change in crystalline quartz particles experience as they pass up and down a temperature window centering on 573C.
By Tony Hansen
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