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Midstone

Plainsman Native Clay

OxideAnalysisFormula
BaO0.32%0.012
CaO0.23%0.024
MgO0.65%0.096
K2O2.59%0.163
Na2O0.06%0.006
P2O50.15%0.006
TiO20.68%0.050
Al2O317.19%1.000
SiO270.37%6.948
Fe2O31.26%0.047
MnO0.01%0.001
LOI6.49
Oxide Weight554.86
Formula Weight593.37
If this formula is not unified correctly please contact us.
GSPT - Frit Softening Point PCE 23

A unique fine grained, clean material, vitrifying and reaching very high strength at cone 8. It is well balanced and of medium plasticity and suitable as the main constituent for mid-temperature bodies and to promote vitrification in the higher ranges without adding dark color. This material is balanced enough to use by it self for pottery.

Fired Temperature, Cone 3 4 5 6 7 8
--------------------------------------
Fired Shrinkage: 4.5% 4.8% 5.2% 5.6% 6.1% 6.0%
Absorption: 6.0% 5.0% 3.8% 2.4% 1.4% 1.0%
Fired Strength:
(lbs/ square inch) 7000 9000 10700 11600 12200

Sieve Analysis Wet Washed
(Root of 2 series) +35 +48 +65 +100 +150# +200 +325
--------------------------------------------
0.0% 0.1 0.4% 1.2% 2.0% 4.1% 11.8%

Texture: Smooth
Plastic Index (1-10): 6
Green Strength (lbs/sqaure inch): 1050
Dry shrinkage: 6.0
Dried density: 2.03
PCE: 23


What does Goldart look like if you fire it by itself?

What does Goldart look like if you fire it by itself?

Goldart (left) compared to Plainsman Midstone (right). Goldart is a buff and vitreous stoneware at cone 10R. These are fired at cone 7, 8, 10 oxidation and 10 reduction (bottom to top). Soluble salts in the Goldart impart a darker coloration to the reduction fired bar). The Midstone has some coarser particles that make larger speckles in reduction.

Out Bound Links


By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="Midstone" descrip="Plainsman Native Clay" searchkey="" loi="6.49" casnumber="70694-09-6"> <oxides> <oxide symbol="BaO" name="Barium Oxide, Baria" status="" percent="0.320" tolerance=""/> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="0.230" tolerance=""/> <oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="0.650" tolerance=""/> <oxide symbol="K2O" name="Potassium Oxide" status="" percent="2.590" tolerance=""/> <oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="0.060" tolerance=""/> <oxide symbol="P2O5" name="Phosphorus Pentoxide" status="" percent="0.150" tolerance=""/> <oxide symbol="TiO2" name="Titanium Dioxide, Titania" status="" percent="0.680" tolerance=""/> <oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="17.190" tolerance=""/> <oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="70.370" tolerance=""/> <oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="1.260" tolerance=""/> <oxide symbol="MnO" name="Manganous Oxide" status="" percent="0.010" tolerance=""/> </oxides> <volatiles> <volatile symbol="LOI" name="Loss on Ignition" percent="6.490" tolerance=""/> </volatiles> </material>


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