Cryolite
Formula: Na3AlF6
| DENS - Density (Specific Gravity) |
2.95 |
| HMOH - Hardness (Moh) |
2.5-3 |
| MLPT - Melting Point (MP) |
1832C D |
A fluoride of aluminum and sodium associated with granite. It is a valuable source of insoluble sodium used in enameling and sometimes in frits and glazes. This material is a very active melter.
Because cryolite lacks oxygen it is useful in creating artificial reduction glazes for electric firing.
Since this material is looking for oxygen to satisfy vacancies resulting from the gassing away of fluorine, it will take it from the kiln atmosphere or from neighboring molecules. The net effect of this take up is that cryolite has a lower than expected LOI.
The reaction is likely 2 Na3AlF6 producing 3 Na2O, 1 Al2O3 and 12 F. 2 Na3AlF6 has a weight of 419.8, 3 Na2O. Al2O3 has a weight of 287.8 and 12 F is 228. In a theoretical reaction 419.8 grams goes in and 515.8 comes out (assuming F stays in the elemental state and oxygen is absorbed from elsewhere as needed). However various factors can play to effect a partial gassing of fluorine and an incomplete supply of oxygen to fill all vacancies. The complexity of the situation can be demonstrated by mixing it half-and-half with kaolin, weighing, firing to cone 6 and weighing again. In one such test we did the cryolite lost 13.9% of its weight. Considering that the kaolin component loses 13% there still should have been a net gain. The mixture was an incredibly active melter (it needs to be fired in a deep crucible), this suggests that F was gassing.
Out Bound Links
- (URLs)
Cryolite at Mineral.galleries.com
http://mineral.galleries.com/minerals/halides/cryo... - (URLs)
Cryolite at WebMineral.com
http://webmineral.com/data/Cryolite.shtml - (URLs)
Cryolite at MinDat.org
http://www.mindat.org/min-1161.html - (URLs)
Wikipedia Cryolite
http://en.wikipedia.org/wiki/Cryolite - (Hazards - General)
Cryolite and Ceramics
The hazards of using this material in the ceramic ... - (Oxides - Unspecified)
F - Fluorine
- (Hazards - General)
Fluorine Gas
Hazards of this material in the ceramic industry a... - (Typecodes)
1: GNM - Generic Material
- (Typecodes)
1: FLS - Flux Source
- (MDT - Member)
Enamel Industry
We are working on this database and would apprecia... - (MDT - Member)
Crystal Glazes
These materials are specially defined for makers o... - (MDT - Member)
UK
We are working on this database and would apprecia... - (MDT - Member)
Ron Roy
This is the traditional Ron Roy materials file. He... - (MDT - Member)
North America
The decision about what materials to include in th... - (MDT - Member)
Glass Industry
The materials included in this MDT were selected i... - (MDT - Member)
New Zealand
We are working on this database and would apprecia... - (MDT - Member)
Latin and South America
Latin America and South America. We are working on... - (MDT - Member)
Europe
Countries of Eastern Europe and former Soviet Unio... - (MDT - Member)
Australia
We are working on this database and would apprecia... - (MDT - Member)
Asia
All of Asia including Turkey, Russia, Indosnesia, ... - (MDT - Member)
Africa
All of continental Africa. We are working on this ...
In Bound Links
XML for Import into INSIGHT
<?xml version="1.0" encoding="UTF-8"?>
<material name="Cryolite" descrip="" searchkey="Cryloite, Sodium Fluoaluminate, Kryolith" loi="0.00" casnumber="15096-52-3">
<oxides>
<oxide symbol="Na2O" name="Sodium Oxide, Soda" status="U" percent="44.310" tolerance=""/>
<oxide symbol="F" name="Fluorine" status="" percent="54.310" tolerance=""/>
<oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="24.250" tolerance=""/>
</oxides>
</material> | 
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