Category: Glaze > Green
Created 2015-10-21 00:28:43 by Terry Rorison
Categories: Glaze > Green
Firing Temperature: Δ6
Atmospheres: Oxidation
Surface Type: Glossy
Transparency: Translucent

"I have introduced a cooling cycle to the firing. The cycle is as follows and the firing is accompanied by a Cone 6 witness cone. After 12 consecutive firings, the witness cones are identical from firing to firing."

The firing cycle:
Rate Temp Hold Time
rA1= 360 F1 = 900 0
rA2= 300 F2 = 1800 0
rA3 =200 F3 = 2016 0
rA4 = 108 F4 = 2197 0.3
rA5 = Full F5 =1800 0
rA6 =150 F6 = 1300 0
rA7 = 0000

To summarize, I fire at a rate of 360/hr to 900 degrees F, then at 300 degrees/ hr to 1800 degrees F, 200 degrees/hr until 2016 degrees F is reached, then 108 degrees/hour to 2197 at which time I hold it at that temperature for 30 minutes.

The kiln is shut off until a temperature of 1800 degrees F is reached and then turned on to slow the rate of cooling to 150 degrees/hr until 1300 degrees F is reached. At this point the kiln is turned off and cools naturally.

Western Pennsylvania Potters Community

http://wpapotters.blogspot.com/2012/04/links-to-cone-6-oxidation-glaze-tests.html

http://www.wpapotters.blogspot.com/2011/10/cone-6-oxidation-results-group-7.html

Material Amount Batch Subtotal
Wollastonite (Theoretical) 28
EPK 28
Frit 3195 23
Silica 17
Nepheline Syenite (Theoretical) 4
Total Base:100
Rutile 6
Copper Carbonate 4
Total: 110

Percentage Analysis

Ingredient Amount SiO2 Al2O3 B2O3 MgO CaO K2O Na2O KNaO P2O5 Fe2O3 TiO2 CuO LOI
Wollastonite (Theoretical)2814.4813.52
EPK2812.810.460.030.050.10.020.120.070.210.114.15
Frit 31952311.122.765.22.611.311.31
Silica1717
Nepheline Syenite (Theoretical)42.430.930.030.180.390.570.03
Rutile60.595.40.01
Copper Carbonate42.581.42
Total11057.8314.155.20.0316.210.281.7220.070.815.512.585.61
100% no LOI 55.413.554.980.0315.530.271.651.920.070.785.272.47

Unity Molecular Formula (UMF)

FLUXES

RO/R2O

0.09 Na2O
0.01 K2O
0.9 CaO
STABILIZERS

R2O3

0.43 Al2O3
0.23 B2O3
GLASS-FORMERS

RO2

3 SiO2
0.22 TiO2
OTHER

 

0.02 Fe2O3
0.1 CuO
SILICA:ALUMINA

SiO2:Al2O3

6.94

FLUX RATIO

R2O:RO

0.1 : 0.9

SiO2:Al2O3 Chart

Closest 100 neighbors in Glaze > Green.

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Stull Chart
SiO2:Al2O3 Ratio
SiO2:Al2O3 Ratio 6.94

Similar RO/R2O Unity Formulas

R2O3 - STABILIZERS RO2 - GLASS FORMERS RO/R2O - FLUXES
Recipe Name ΔTemp Al2O3 B2O3 SiO2 ZrO2 SnO2 TiO2 KNaO K2O Na2O CaO MgO ZnO BaO PbO Li2O SrO
Ron Roy Spearmint 6 0.43 0.23 3 0.22 0.1 0.01 0.09 0.9
Ron Roy Raw Sienna 6 0.43 0.23 3 0.22 0.1 0.01 0.09 0.9
Ron Roy High Calcium Semimatte Base 2 6 0.43 0.23 3 0.22 0.1 0.01 0.09 0.9
MC6 High Calcium Matte Base 2 6 0.43 0.23 3 0.22 0.1 0.01 0.09 0.9
Raw Sienna 6 0.43 0.23 3 0.22 0.1 0.01 0.09 0.9
Variegated Slate Blue 6 0.44 0.2 3 0.22 0.09 0.01 0.08 0.91
Mint Green 6 0.44 0.2 3 0.22 0.09 0.01 0.08 0.91
MC6G Spearmint 6 0.43 0.23 3 0.22 0.1 0.01 0.09 0.9
Ocean Trench Blue 5-6 0.44 0.2 3 0.22 0.09 0.01 0.08 0.91
Raw Sienna (Cedar Hill) 6 0.43 0.23 3 0.22 0.1 0.01 0.09 0.9
MC6G 2c 5½-6 0.46 0.24 3.05 0.21 0.1 0.01 0.09 0.91

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Hazards

09/2016 Note: This is a new feature. If a recipe material is not listed, that material's data has not yet been added. Some materials only have GHS ratings, while others only have HMIS ratings. Warnings differ between systems and countries. Glazy does not take any responsibility for accuracy of linked SDS information. Contact your ceramics supplier for safety information for your specific materials.
Globally Harmonized System (GHS) Hazardous Materials Identification System (HMIS) SDS Link
Material Pictograms Signal Word Hazard Statements Health Flammability Hazard Protection
Wollastonite (Theoretical) Health Hazard DANGER Vansil W-30 Wollastonite SDS:
May cause cancer if inhaled.
Causes damage to organs through prolonged or repeated exposure if inhaled. (respiratory tract)
EPK HarmfulHealth Hazard DANGER EPK Kaolin is a naturally occurring mineral, which may contain amounts of crystalline silica
typically 0.1-1.0%, may cause damage to respiratory system through prolonged or repeated
exposure.
1 0 0 E
Silica HarmfulHealth Hazard DANGER From 200-Mesh SDS:
May cause cancer by inhalation.
Causes damage to lungs through prolonged or repeated exposure by inhalation.
* 0 0 E
Rutile 1 0 0
Copper Carbonate Harmful WARNING Harmful if swallowed.
Causes skin irritation.
Causes serious eye irritation.