Ceramic Materials

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•The secret to cool bodies and glazes is alot of testing.
•The secret to know what to test is material and chemistry knowledge.
•The secret to learning from testing is documentation.
•The place to test, do the chemistry and document is an account at https://insight-live.com
•The place to get the knowledge is https://digitalfire.com

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Plainsman Plastic Gerstley Borate Substitute

Alternate Names: Boraq 1

Oxide Weight79.48
Formula Weight106.40
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 is the tradename for a material developed jointly by Digitalfire Corp. and Plainsman Clays. It is a substitute for Gerstley Borate. Digitalfire Corporation has made this recipe public and created a web site to document it. The aim of this open approach is to solicit your help to improve it and produce a Boraq 2 recipe for final production. The materials and Boraq itself are for sale at the website linked to this recipe.

Within INSIGHT you can double click any of the materials in the recipe and INSIGHT will show you their chemistry. Then click the 'More Info' button in the Materials dialog and INSIGHT will display even more information. Double-click the item in the list in the Materials dialog and you'll get even more.

We suggest you enter the Gerstley Borate and Boraq chemistries into INSIGHT and compare them. The website at www.gerstleyborate.com has a material-by-material and oxide-by-oxide analysis for the similarities and differences between boraq and gerstley borate.

You can order a sample of this material at https://digitalfire.com/plainsman/store/store.php


Floating blue at cone 6 using boraq gerstley borate substitute.

Out Bound Links

In Bound Links

By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="Boraq" descrip="Plainsman Plastic Gerstley Borate Substitute" searchkey="Boraq 1" loi="0.00" casnumber="167077-83-0"> <oxides> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="U" percent="21.800" tolerance=""/> <oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="U" percent="2.300" tolerance=""/> <oxide symbol="K2O" name="Potassium Oxide" status="U" percent="0.600" tolerance=""/> <oxide symbol="Na2O" name="Sodium Oxide, Soda" status="U" percent="3.600" tolerance=""/> <oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="2.800" tolerance=""/> <oxide symbol="B2O3" name="Boric Oxide" status="U" percent="30.000" tolerance=""/> <oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="13.500" tolerance=""/> <oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="0.200" tolerance=""/> </oxides> <volatiles> <volatile symbol="LOI" name="Loss on Ignition" percent="25.300" tolerance=""/> </volatiles> </material>

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