Zircopax
Zirconium Silicate
Chemistry
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Links to Other Materials
- Zircon - Parent
- Zircopax Plus - Related
- Tin Oxide - Alternative
- Superpax - Related
- Ultrox - Related
- Cache
Miscellaneous
- Family: Opacifier
- Region: North America
- Mined At: Unspecified
- Raw Mineral: No
- Generic: No
Notes
Zircopax is a brand name version of zirconium silicate. It is often used for semi-opaqueness, finer materials like Superpax being used for full opacity.
In North America, the most popular zirconium opacifiers are made by TAM, and fall under the brand names of Zircopax, Superpax and Excelopax. These vary according to particle size, the finer the size the greater the scattering of light (and thus the better the opacification). In addition, the finer sized materials contain a little extra silica for maximum whiteness.
Typical Properties:
Formula: ZrSio4 Weight: 183.1
Linear Coefficient of Expansion:
-25-700C cm/cm/degreeC 42 x 10 -7
Specific gravity: 4.5
Particle Size: Zircopax Superpax Excelopax
Microns, Ave. 1.3 .74 .55
Bulk density lbs/cu ft 100 75 75
Surface area, m2/g 4.5 9.8 12.8
Properties
Glaze Opacifier - White
Zirconium silicates are used primarily as opacifiers in glazes at all temperatures. Although tin oxide is more effective, zirconium materials are much cheaper and are more stable in reduction and less reactive with some colorants (i.e. chrome). Although zirconium oxide is effective as an opacifier, zirconium silicates disperse better and are cheaper where the glaze can tolerate or be reformulated to tolerate the added silica.
Data
- Melting Point (MP): 2550C
- Melting Point (MP): 2550C
Suppliers
- Johnson Matthey, Colors and Coatings
Authors
- Tony Hansen (Owner)
XML
<?xml version="1.0" encoding="UTF-8"?>
<material name="Zircopax" descrip="Zirconium Silicate" generic="0" rawmineral="0" searchkey="" loi="0.00">
<families>
<family name="Opacifier"/>
</families>
<regions>
<region name="North America"/>
</regions>
<oxides>
<oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="32.790" tolerance=""/>
<oxide symbol="ZrO2" name="Zirconium Dioxide" status="U" percent="67.210" tolerance=""/>
</oxides>
<references>
<reference name="seealso" reason=""/>
<reference name="seealso" reason=""/>
<reference name="seealso" reason=""/>
<reference name="seealso" reason=""/>
<reference name="seealso" reason=""/>
</references>
<suppliers>
<supplier name="Johnson Matthey, Colors and Coatings" country="US" url="www.johnsonmatthey.com" label=""/>
</suppliers>
<notes>
<note>Zircopax is a brand name version of zirconium silicate. It is often used for semi-opaqueness, finer materials like Superpax being used for full opacity.
In North America, the most popular zirconium opacifiers are made by TAM, and fall under the brand names of Zircopax, Superpax and Excelopax. These vary according to particle size, the finer the size the greater the scattering of light (and thus the better the opacification). In addition, the finer sized materials contain a little extra silica for maximum whiteness.
Typical Properties:
Formula: ZrSio4 Weight: 183.1
Linear Coefficient of Expansion:
-25-700C cm/cm/degreeC 42 x 10 -7
Specific gravity: 4.5
Particle Size: Zircopax Superpax Excelopax
Microns, Ave. 1.3 .74 .55
Bulk density lbs/cu ft 100 75 75
Surface area, m2/g 4.5 9.8 12.8
</note>
</notes>
<testdata>
<testitem testname="5" value="2550C"/>
<testitem testname="5" value="2550C"/>
</testdata>
</material>
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