Potash Feldspar
Formula: K2O.Al2O3.6SiO2
| DENS - Density (Specific Gravity) |
2.56 |
| MLPT - Melting Point (MP) |
1250C M |
One of the most important materials for medium and high temperature ceramic glazes. Potash feldspars are often not as pure and white as soda spars. A feldspar is typically referred to as 'potash' if there is significantly more potassium than sodium (typically there will be 2-5% Na2O). If the amounts are closer to equal they are termed potash-soda feldspars (or vice versa). Of course, real potash feldspars also have small amounts of CaO, MgO, Fe2O3, etc.
Potassium feldspar melts at around 1200C (higher than soda feldspar) producing a more a viscous melt than does sodium feldspar. It can also produce a crystalline phase (leucite) that contributes to opacity. Thus, in industry, potash feldspars are often used more for matte glazes while soda feldspar is used for glossy glazes.
Glazes high in feldspar (35% or more) are plagued by crazing problems, yet still used by tens of thousands of potters. 'Flux saturated' glazes with more than 50% feldspar may be unbalanced and lack adequate glass former or alumina to create a stable hard glass resistant to leaching.
Out Bound Links
- (Minerals - Related)
Leucite
Hardness: 5.5-6 Density: 2.5
K2O 21.50%, Al2O3 ... - (Materials - Related)
Soda Feldspar - Na2O.Al2O3.6SiO2
Na-Feldspar, Na Feldspar, Albite
- (Materials - Related)
Calcium Feldspar - CaO.Al2O3.4SiO2 or CaAl2Si2O8
Lime Spar, Lime Feldspar, Ca-Feldspar
- (Hazards)
Feldspar
The hazards of this material in the ceramic indust... - (Materials - Parent)
Feldspar
- (Typecodes)
1: GNM - Generic Material
- (Typecodes - Type)
1: FEL - Feldspar
- (Minerals - Parent mineral)
Anorthosite
A plagioclase feldspar rock containing ilmenite. - (Minerals - Parent mineral)
Microcline, Anorthoclase
A potassium feldspar. - (Minerals - Parent mineral)
Sanidine
A potash feldspar mineral. - (MDT - Member)
Latin and South America
Latin America and South America. We are working on... - (MDT - Member)
Generic
Generic for building a completely custom MDT. Only... - (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 ... - (MDT - Member)
New Zealand
We are working on this database and would apprecia... - (MDT - Member)
North America
The decision about what materials to include in th... - (MDT - Member)
Ron Roy
This is the traditional Ron Roy materials file. He... - (MDT - Member)
UK
We are working on this database and would apprecia... - (MDT - Member)
Crystal Glazes
These materials are specially defined for makers o... - (MDT - Member)
Enamel Industry
We are working on this database and would apprecia... - (MDT - Member)
Glass Industry
The materials included in this MDT were selected i... - (Typecodes - Area of use)
1: DEN - Materials used in Denmark
- (Library - Unspecified)
Out of the Earth, into the Fire: A Course in Ceramic Materials for the Studio Potter
A book by by Mimi Obstler, Robina Simpson, and Ant...
In Bound Links
- (Materials - Parent)
FK45 Feldspar - Sodium Potassium Feldspar
- (Materials - Alternative)
Cornwall Stone
Cornish Stone, China Stone, Corn Stn, China-stone
- (Materials - Parent)
Custer Feldspar - Potash Feldspar
Custer Spar
- (Materials - Parent)
Eureka Feldspar - Legacy low calcium potash feldspar
- (Materials - Parent)
F-20 Feldspar - Potash/sodium/calcium 20 mesh Feldspar
F20 Feldspar
- (Materials - Parent)
G-20 Feldspar - Potash/sodium/calcium 20 mesh Feldspar
G20 Feldspar
- (Materials - Parent)
G-200 Feldspar - Potash/sodium/calcium 200 mesh Feldspar
G200 Feldspar, G200 Spar, G 200 Spar, G 200, G 200 Feldspar
- (Materials - Parent)
G-40 Feldspar - Potash/sodium/calcium Feldspar
- (Materials - Parent)
FM6 Feldspar - Sodium Potassium Feldspar
- (Materials - Parent)
KM71 Feldspar - Potash Feldspar
- (Materials - Parent)
261-F Feldspar - Legacy potash feldspar
- (Materials - Parent)
Sil-o-spar - Potash/sodium/calcium Feldspar
- (Materials - Parent)
Maine Feldspar - Legacy potash feldspar
- (Materials - Parent)
MC Na-200 Feldspar
NA200, MC NA 200
- (Materials - Parent)
A-3 Feldspar - potash feldspar
A3 Feldspar, Kona A-3 Feldspar, Kona A3 Feldspar
- (Materials - Parent)
Clinchfield #202 - Legacy potash feldspar
Clinchfield 202
- (Materials - Parent)
Elbrook Feldspar - Legacy Potash feldspar
Elbrook Spar
- (Materials - Parent)
Keystone Feldspar - Legacy potash feldspar
Keystone Spar
- (Materials - Parent)
Madoc Feldspar - Legacy Potash feldspar
Madoc Spar, Madoc H Feldspar
- (Materials - Parent)
NC-4 Feldspar
NC4 Feldspar, Spruce Pine #4 Spar
- (Materials - Parent)
Yankee Feldspar - Legacy Potash Feldspar
Yankee Spar
- (Materials - Parent)
SP-G Feldspar - Sodium/potassium/calcium Feldspar
- (Materials - Parent)
MC K-325 Feldspar
MC K325, K325
- (Oxides - Material source)
K2O - Potassium Oxide
Pictures
Orthoclase Feldspar Rock
Orthoclase In Granodiorite
Orthoclase Crystals
XML for Import into INSIGHT
<?xml version="1.0" encoding="UTF-8"?>
<material name="Potash Feldspar" descrip="" searchkey="K-Feldspar, Orthoclase, K Feldspar, Potassium Feldspar" loi="0.00" casnumber="12168-80-8">
<oxides>
<oxide symbol="K2O" name="Potassium Oxide" status="U" percent="16.920" tolerance=""/>
<oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="18.320" tolerance=""/>
<oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="64.760" tolerance=""/>
</oxides>
</material> | 
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