Ferro Frit CC-257
High Barium Frit
| COLE - Co-efficient of Linear Expansion |
6.8 |
A fritted source of barium. Essentially an alkaline-earth aluminum silicate. The formula of this frit is not published however we got it from Val Cushing's Notebook. Use with Frit CC-265 for satin effects.
Ferro's instructions are:
First determine the percent BaO in the glaze (% barium carbonate times 0.777), then divide that figure by 0.378 to determine the amount of frit necessary to supply that amount of BaO. [Example: assume 12% barium carbonate; X 0.777 - 9.324% BaO, / 0.378 = 24.67 parts CC257-2 to supply the equivalent amount of BaO as 12% barium carbonate.] Then, reduce the alumina and silica in the glaze by the extra percentage of frit used (24.67 - 12, = 12.67), in the ratio of approximately 1 alumina : 4 silica.
Approximate Composition:
CaO less than 5%
BaO 37.8
Al2O3 5-25%
SiO2 25-50%
ZrO2 less than 5%
TiO2 less than 5%
Coefficient of expansion (calculated): 8.24 x 10-6
Coefficient of expansion (measured): 6.8 x 10-6
Frit Fusion: 1700F
Empirical Silica:Alumina ratio: 14.07
CAS Number: 65997-18-4
Out Bound Links
XML for Import into INSIGHT
<?xml version="1.0" encoding="UTF-8"?>
<material name="Ferro Frit CC-257" descrip="High Barium Frit" searchkey="Frit CC257" loi="0.00" casnumber="65997-18-4">
<oxides>
<oxide symbol="BaO" name="Barium Oxide, Baria" status="" percent="33.800" tolerance=""/>
<oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="5.500" tolerance=""/>
<oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="0.310" tolerance=""/>
<oxide symbol="K2O" name="Potassium Oxide" status="" percent="0.790" tolerance=""/>
<oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="1.000" tolerance=""/>
<oxide symbol="SrO" name="Strontium Oxide, Strontia" status="" percent="0.570" tolerance=""/>
<oxide symbol="TiO2" name="Titanium Dioxide, Titania" status="" percent="2.200" tolerance=""/>
<oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="9.260" tolerance=""/>
<oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="46.520" tolerance=""/>
<oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="0.040" tolerance=""/>
</oxides>
</material> | 
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