Soda Feldspar
Formula: Na2O.Al2O3.6SiO2
| DENS - Density (Specific Gravity) |
2.60 |
| MLRG - Melting Range (C) |
1100-1150C |
Soda Feldspar is generally a clean white mineral that sources sodium, alumina and silica along with some potassium and calcium. No actual materials have the ideal formula shown here, they all have some K2O and small amounts of other contaminants. Manufacturers refer to their materials as 'soda' if Na2O predominates over K2O (often manufacturers refer to their materials at soda-potash feldspars (or vice versa) if neither of the oxides predominates). Nepheline Syenite is often used in similar circumstances, however it has a higher alumina content (often the lower alumina content of soda feldspar provides more room in glaze recipes for alumina sourcing ball clay or kaolin to help suspend the slurry).
Albite mineral, from which soda feldspar is derived, often tends to be white in appearance compared with the pinkish hue of orthoclase mineral from which potash feldspar is ground.
In many cases soda and potash feldspar are interchangeable in glaze recipes. However, some differences will be apparent. Soda feldspar normally melts better. Also, slightly different color responses will be encountered (i.e. cobalt tends toward purple copper toward blue with soda spar). Sometimes colors will be brighter with soda feldspar. In addition, soda spar has a higher coefficient of expansion and melts earlier and has a shorter range before it begins to volatilize.
Crazing Alert:
Because sodium has the highest expansion of all oxides and because it is high in this material, glazes with a lot of soda spar will almost always craze. Thus, if any glaze recipe has more than 30% soda feldspar, it is wise to test carefully to assure the glaze is not in tension (use glaze calculation software to reduce the Na2O and replace it with CaO, MgO or another fluxing oxide if possible). It is important to remember that if a glaze is high in Na2O, diluting it with other oxides to try to reduce crazing is a losing battle, it is the cause of the problem, it needs to be reduced.
Out Bound Links
In Bound Links
- (Materials - Alternative)
Cornwall Stone
Cornish Stone, China Stone, Corn Stn, China-stone
- (Materials - Parent)
FM6 Feldspar - Sodium Potassium Feldspar
- (Materials - Related)
Potash Feldspar - K2O.Al2O3.6SiO2
K-Feldspar, Orthoclase, K Feldspar, Potassium Feldspar
- (Materials - Parent)
F7 Feldspar - Soda Feldspar
- (Materials - Parent)
Unispar 50 - Soda Feldspar
Unispar-50
- (Materials - Parent)
F7/SE Feldspar - Soda Feldspar
Feldspar Soda F7/SE
- (Materials - Parent)
F7/SG Feldspar - Soda Feldspar
- (Materials - Parent)
FK45 Feldspar - Sodium Potassium Feldspar
- (Materials - Parent)
M74 Feldspar - Soda Feldspar
- (Materials - Parent)
A-3 Feldspar - potash feldspar
A3 Feldspar, Kona A-3 Feldspar, Kona A3 Feldspar
- (Materials - Parent)
F-20 Feldspar - Potash/sodium/calcium 20 mesh Feldspar
F20 Feldspar
- (Materials - Parent)
SP-G Feldspar - Sodium/potassium/calcium Feldspar
- (Materials - Parent)
Sil-o-spar - Potash/sodium/calcium Feldspar
- (Materials - Parent)
NC-4 Feldspar
NC4 Feldspar, Spruce Pine #4 Spar
- (Materials - Parent)
MC Na-200 Feldspar
NA200, MC NA 200
- (Materials - Parent)
Madoc Feldspar - Legacy Potash feldspar
Madoc Spar, Madoc H Feldspar
Pictures
A comparative flow test of Custer, G-200, high soda and high potassium feldspars.
XML for Import into INSIGHT
<?xml version="1.0" encoding="UTF-8"?>
<material name="Soda Feldspar" descrip="" searchkey="Na-Feldspar, Na Feldspar, Albite" loi="0.00" casnumber="12168-80-8">
<oxides>
<oxide symbol="Na2O" name="Sodium Oxide, Soda" status="U" percent="11.820" tolerance=""/>
<oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="19.440" tolerance=""/>
<oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="68.740" tolerance=""/>
</oxides>
</material> | 
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