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Boraq 2

Plainsman Plastic Gerstley Borate Substitute

OxideAnalysisFormula
CaO25.40%0.462
MgO3.60%0.091
K2O0.50%0.005
Na2O3.20%0.053
Al2O32.40%0.024
B2O326.50%0.389
SiO211.90%0.202
Fe2O30.10%0.001
LOI26.40
Oxide Weight75.12
Formula Weight102.07
This is the chemistry of the material (the formula compares numbers of molecules, the analysis compares them by weight). In glazes, the composite chemistry of the mix is the main factor shaping fired properties (e.g. color, melting temperature, surface). In bodies we are interested in their physical properties (e.g. shrinkage, porosity, strength), these are a product of the mineralogy of the materials.

Boraq 2 is derived from Boraq 1 in response to two issues:

-The formula weight of Boraq 1 was too high. This alerted us that the chemistry was more significantly different from Gerstley Borate than the unity formula suggested. We added 8 dolomite and 8 whiting to match up the percentage analysis numbers much better than they had been.

-Boraq 1 was not working well with iron reds. After making the above changes it became evident that this was because of either the lack of CaO or the lack of limestone-like minerals that occur in Gerstley Borate.

This material has a much lower formula weight (although it is still higher than GB which likely contained more clay and tramp minerals than Boraq).


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By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="Boraq 2" descrip="Plainsman Plastic Gerstley Borate Substitute" searchkey="" loi="0.00" casnumber="167077-83-0"> <oxides> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="U" percent="25.400" tolerance=""/> <oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="U" percent="3.600" tolerance=""/> <oxide symbol="K2O" name="Potassium Oxide" status="U" percent="0.500" tolerance=""/> <oxide symbol="Na2O" name="Sodium Oxide, Soda" status="U" percent="3.200" tolerance=""/> <oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="2.400" tolerance=""/> <oxide symbol="B2O3" name="Boric Oxide" status="U" percent="26.500" tolerance=""/> <oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="11.900" tolerance=""/> <oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="0.100" tolerance=""/> </oxides> <volatiles> <volatile symbol="LOI" name="Loss on Ignition" percent="26.400" tolerance=""/> </volatiles> </material>


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