ZINC

Miscellaneous

Notes

(Richard Willis)

Element, with the symbol Zn and atomic weight of 65.58
The oxide and carbonate forms are water insoluble, the oxide fusing at 1975ºC, while the carbonate discomposes. zinc increases resistance to thermal shock thus prevents crackles, particularly at high temperatures. Popular as a mid-temperature (1000-1200ºC) flux, such as in Bristol-ware, and is popular for crystalline glazes, particularly when accompanied by calcium, titanium and/or lithium.
In small portions (5% or less) zinc oxide is as powerful a flux at mid-range temperatures (900-1100ºC) for silica as is lead, and, given its insolubility with water, is often preferred over lead where lead specifically is not called for to produce certain colors. zinc also contributes more than lead to mattes and opaques, and thereby is less desirable for gloss and/or transparent glazes. Added in fritted granules to clays it will, like ilmenite, bleed through glazes at high temperatures and produce spo ts and/or crystalline formations.
commonly used forms
— oxide ZnO
— chlorurium ZnCl2
— carbonate ZnCO3
— sulfate ZnSO4, 7H2O
— alumina ZnO, Al2O3
— sulfur ZnS
— chromate ZnCrO4
— zircon ZnO, ZrO2, SiO2

Authors

XML

<?xml version="1.0" encoding="UTF-8"?>
<material name="ZINC" descrip="" generic="0" rawmineral="1" searchkey="" loi="0.00">
<notes>
<note>Element, with the symbol Zn and atomic weight of 65.58&lt;BR&gt;
The oxide and carbonate forms are water insoluble, the oxide fusing at 1975&amp;ordm;C, while the carbonate discomposes. zinc increases resistance to thermal shock thus prevents crackles, particularly at high temperatures. Popular as a mid-temperature (1000-1200&amp;ordm;C) flux, such as in Bristol-ware, and is popular for crystalline glazes, particularly when accompanied by calcium, titanium and/or lithium.&lt;BR&gt;
In small portions (5% or less) zinc oxide is as powerful a flux at mid-range temperatures (900-1100&amp;ordm;C) for silica as is lead, and, given its insolubility with water, is often preferred over lead where lead specifically is not called for to produce certain colors. zinc also contributes more than lead to mattes and opaques, and thereby is less desirable for gloss and/or transparent glazes. Added in fritted granules to clays it will, like ilmenite, bleed through glazes at high temperatures and produce spo
ts and/or crystalline formations.&lt;BR&gt;
&lt;B&gt;commonly used forms&lt;BR&gt;
&lt;/B&gt;&amp;#151; oxide ZnO&lt;BR&gt;
&amp;#151; chlorurium ZnCl&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;&lt;SUB&gt;&lt;BR&gt;
&lt;/SUB&gt;&amp;#151; carbonate ZnCO&lt;FONT SIZE=2&gt;&lt;SUB&gt;3&lt;/SUB&gt;&lt;/FONT&gt;&lt;SUB&gt;&lt;BR&gt;
&lt;/SUB&gt;&amp;#151; sulfate ZnSO&lt;FONT SIZE=2&gt;&lt;SUB&gt;4&lt;/SUB&gt;&lt;/FONT&gt;, 7H&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O&lt;SUB&gt;&lt;BR&gt;
&lt;/SUB&gt;&amp;#151; alumina ZnO, 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;&lt;SUB&gt;&lt;BR&gt;
&lt;/SUB&gt;&amp;#151; sulfur ZnS&lt;BR&gt;
&amp;#151; chromate ZnCrO&lt;FONT SIZE=2&gt;&lt;SUB&gt;4&lt;/SUB&gt;&lt;/FONT&gt;&lt;SUB&gt;&lt;BR&gt;
&lt;/SUB&gt;&amp;#151; zircon ZnO, ZrO&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;, SiO&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;&lt;BR&gt;

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


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