HYDROBORACITE

Miscellaneous

Notes

(Richard Willis)

Mineral, of the ideal form CaO, MgO, 3B3O3, 2H2O with a typical empirical analysis of boric acid 50%, cal. ox. 13.5%, mag. oxide 9.5%, and water 10%
Water insoluble Fuses at 850ºC
A popular substitute for colemanite or lead as a fluxing agent for under-1000ºC firings. see boracite, boron, and colemanite.
hydroboracite glazes
Similar usage as with colemanite: a viable way to substitute boron for lead as the principal flux in mid-temperature firings. Usually, hydroboracite is simply substituted in equal dry-weight parts for any occurance of a borate (including colemanite) or/and lead in a given recipe. Another, more precise, manner is to calculate what hydroboracite will contribute to a given formulation, expressed for example in molecular equivalences (such as the one listed here), and then complete the formulation with the ma terials that it doesn’t provide. see Appendix III
1050ºC — ZnO 0.1, CaO 0.11, Li2O 0.08, BaO 0.2, MgO 0.11, PbO 0.4, Al2O3 0.2, B2O3 0.33, SiO2 2.0
1050ºC — Na2O 0.065, K2O 0.065, CaO 0.15, MgO 0.15, PbO 0.57, Al2O3 0.19, B2O3 0.45, SiO2 2.0
1150ºC — Na2O 0.125, K2O 0.125, CaO 0.5, MgO 0.1, Al2O3 0.25, B2O3 0.3, SiO2 2.75

Authors

XML

<?xml version="1.0" encoding="UTF-8"?>
<material name="HYDROBORACITE" descrip="" generic="0" rawmineral="1" searchkey="" loi="0.00">
<notes>
<note>Mineral, of the ideal form CaO, MgO, 3B&lt;FONT SIZE=2&gt;&lt;SUB&gt;3&lt;/SUB&gt;&lt;/FONT&gt;O&lt;FONT SIZE=2&gt;&lt;SUB&gt;3&lt;/SUB&gt;&lt;/FONT&gt;, 2H&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O with a typical empirical analysis of boric acid 50%, cal. ox. 13.5%, mag. oxide 9.5%, and water 10%&lt;BR&gt;
Water insoluble Fuses at 850&amp;ordm;C&lt;BR&gt;
A popular substitute for colemanite or lead as a fluxing agent for under-1000&amp;ordm;C firings. &lt;FONT SIZE=2&gt;see &lt;B&gt;&lt;I&gt;boracite&lt;/I&gt;&lt;/B&gt;, &lt;B&gt;&lt;I&gt;boron&lt;/I&gt;&lt;/B&gt;, and&lt;B&gt;&lt;I&gt; &lt;/I&gt;&lt;/B&gt;colemanite.&lt;/FONT&gt;&lt;BR&gt;
&lt;B&gt;hydroboracite glazes&lt;/B&gt;&lt;BR&gt;
Similar usage as with colemanite: a viable way to substitute boron for lead as the principal flux in mid-temperature firings. Usually, hydroboracite is simply substituted in equal dry-weight parts for any occurance of a borate (including colemanite) or/and lead in a given recipe. Another, more precise, manner is to calculate what hydroboracite will contribute to a given formulation, expressed for example in molecular equivalences (such as the one listed here), and then complete the formulation with the ma
terials that it doesn&amp;#146;t provide. &lt;FONT SIZE=2&gt;see Appendix III&lt;/FONT&gt;&lt;BR&gt;
&lt;I&gt;1050&amp;ordm;C&lt;/I&gt; &amp;#151; ZnO 0.1, CaO 0.11, Li&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O 0.08, BaO 0.2, MgO 0.11, PbO 0.4, Al&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O&lt;FONT SIZE=2&gt;&lt;SUB&gt;3&lt;/SUB&gt;&lt;/FONT&gt; 0.2, B&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O&lt;FONT SIZE=2&gt;&lt;SUB&gt;3&lt;/SUB&gt;&lt;/FONT&gt; 0.33, SiO&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt; 2.0&lt;BR&gt;
&lt;I&gt;1050&amp;ordm;C&lt;/I&gt; &amp;#151; Na&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O 0.065, K&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O 0.065, CaO 0.15, MgO 0.15, PbO 0.57, Al&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O&lt;FONT SIZE=2&gt;&lt;SUB&gt;3&lt;/SUB&gt;&lt;/FONT&gt; 0.19, B&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O&lt;FONT SIZE=2&gt;&lt;SUB&gt;3&lt;/SUB&gt;&lt;/FONT&gt; 0.45, SiO&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt; 2.0&lt;BR&gt;
&lt;I&gt;1150&amp;ordm;C&lt;/I&gt; &amp;#151; Na&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O 0.125, K&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O 0.125, CaO 0.5, MgO 0.1, Al&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O&lt;FONT SIZE=2&gt;&lt;SUB&gt;3&lt;/SUB&gt;&lt;/FONT&gt; 0.25, B&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O&lt;FONT SIZE=2&gt;&lt;SUB&gt;3&lt;/SUB&gt;&lt;/FONT&gt; 0.3, SiO&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt; 2.75&lt;BR&gt;

</note>
</notes>
</material>


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