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Ravenscrag Slip 1900F Calcined

Silty fusible low iron clay

OxideAnalysisFormula
BaO0.30%0.007
CaO11.10%0.682
MgO1.90%0.163
K2O3.30%0.121
Na2O0.50%0.028
TiO20.40%0.017
Al2O313.80%0.466
SiO267.80%3.889
Fe2O30.90%0.019
Oxide Weight344.76
Formula Weight344.76
If this formula is not unified correctly please contact us.

The chemistry of this material is slightly different than for raw Ravenscrag Slip (it does not lose any weight on firing, so it supplies more of each of the oxides to the fired glaze, 9% more). This chemistry provided here assumes complete calcination (to at least cone 04). However there is an issue. The page at ravenscrag.com recommends roasting to only 1000F, at that temperature it looses only 3% weight on firing.

Another issue is particulates. When calcined at 1900F, particles sinter together into larger ones, requiring glaze ball milling. But at 1000F this does not occur.


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In Bound Links


By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="Ravenscrag Slip 1900F Calcined" descrip="Silty fusible low iron clay" searchkey="" loi="0.00" casnumber=""> <oxides> <oxide symbol="BaO" name="Barium Oxide, Baria" status="" percent="0.300" tolerance=""/> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="11.100" tolerance=""/> <oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="1.900" tolerance=""/> <oxide symbol="K2O" name="Potassium Oxide" status="" percent="3.300" tolerance=""/> <oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="0.500" tolerance=""/> <oxide symbol="TiO2" name="Titanium Dioxide, Titania" status="" percent="0.400" tolerance=""/> <oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="13.800" tolerance=""/> <oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="67.800" tolerance=""/> <oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="0.900" tolerance=""/> </oxides> </material>


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