Category: Glaze > Red > Stain
Created 2015-10-20 05:34:08 by Terry Rorison
Categories: Glaze > Red > Stain
Firing Temperature: Δ6
Atmospheres: Oxidation
Surface Type: Matte
Transparency: Opaque

"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-5.html

Used Standard Ceramic's #487 Red Stain 10%

Material Amount Batch Subtotal
Nepheline Syenite (Theoretical) 49
Silica 12
Whiting 11
EPK 10
Gillespie Borate 9
Lithium Carbonate 9
Total Base:100
Soda Ash 10
Red stain 10
Titanium Dioxide 5
Total: 125

Percentage Analysis

Ingredient Amount SiO2 Al2O3 B2O3 MgO CaO SrO Li2O K2O Na2O KNaO P2O5 Fe2O3 TiO2 LOI
Nepheline Syenite (Theoretical)4929.7411.420.050.342.254.87.050.050.34
Silica1212
Whiting116.174.83
EPK104.573.740.010.020.030.010.040.030.080.041.48
Gillespie Borate91.060.152.20.352.070.040.340.342.78
Lithium Carbonate93.675.33
Soda Ash10555
Red stain10
Titanium Dioxide55
Total12547.3815.312.20.418.60.043.672.2910.1512.440.030.125.0419.77
100% no LOI 49.7516.072.310.439.030.043.852.410.6613.060.030.135.29

Unity Molecular Formula (UMF)

FLUXES

RO/R2O

0.34 Na2O
0.05 K2O
0.26 Li2O
0.32 CaO
0.02 MgO
STABILIZERS

R2O3

0.32 Al2O3
0.07 B2O3
GLASS-FORMERS

RO2

1.66 SiO2
0.13 TiO2
SILICA:ALUMINA

SiO2:Al2O3

5.25

FLUX RATIO

R2O:RO

0.65 : 0.35

SiO2:Al2O3 Chart

Closest 7 neighbors in Glaze > Red > Stain.

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Stull Chart
SiO2:Al2O3 Ratio
SiO2:Al2O3 Ratio 5.25

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
Jen's Juicy Fruit Variation (Red Matte) 6 0.32 0.07 1.66 0.13 0.39 0.05 0.34 0.32 0.02 0.26
Jen's Juicy Fruit Variation (Red Matte) 6 0.32 0.07 1.66 0.13 0.39 0.05 0.34 0.32 0.02 0.26
Jen's Juicy Fruit Variation (Red Matte) 6 0.32 0.07 1.66 0.13 0.39 0.05 0.34 0.32 0.02 0.26
Jen's Juicy Fruit Variation (Red Matte) 6 0.32 0.07 1.66 0.13 0.39 0.05 0.34 0.32 0.02 0.26
Jen's Juicy Fruit Variation Whiting 6 0.3 0.07 1.67 0.13 0.38 0.05 0.33 0.35 0.02 0.24
Jen's Juicy Fruit Variation Base 6 0.32 0.07 1.69 0.13 0.4 0.05 0.35 0.32 0.02 0.26
Jen's Juicy Fruit Variation Base (variation) 6 0.32 0.07 1.69 0.13 0.4 0.05 0.35 0.32 0.02 0.26

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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
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
Whiting Harmful WARNING Causes eye irritation
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
Lithium Carbonate Harmful WARNING Harmful if swallowed.
Causes serious eye irritation.
Harmful to aquatic life.
Soda Ash Harmful WARNING Causes skin irritation.
Causes serious eye irritation.
2 0 0 B
Titanium Dioxide Health Hazard WARNING Suspected of causing cancer