feldspar

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feldspar

[feld′spär]
Etymology: Ger, feld, field, spath, spar
a crystalline mineral of aluminum silicate with potassium, sodium, barium, and calcium. It melts over a range of 593.5° C to 1093° C (1100° F to 2000° F) and is an important component of dental porcelain.

feldspar (feld´spär),

n a crystalline mineral of aluminum silicate with po-tassium, sodium, barium, or calcium– NaAlSi3O8 or KAlSi3O8. Feldspar melts over a range of 1,100°F to 2,000°F (593.5°C to 1093.5°C). An important constituent of dental porcelain.
feldspar, orthoclase ceramic,
n a clay found in large quantity in the solid crust of the earth. It acts as a filler and imparts body to the fused dental porcelain.
References in periodicals archive ?
The raw materials used were kaolin, ball clay felspar, quartz, tale and water at appropriate percentages.
TABLE 6: Different Material Compositions 1st test 2nd test 3rd test 4th test Kankara kaolin Barkin Ladi kaolin Kankara kaolin Barkin Ladi Zaria felspar Lokoja felspar Lokoja felspar Zaria felspar Lokoja quartz Lokoja quartz Lokoja quartz Lokoja quartz
Barkin Ladi kaolin 50% * Lokoja felspar 25% * Lokoja quartz 24% * Ukpilla Calcium Carbonate 1% * Barium Carbonate imported 0.
When the clay becomes plastic after additions of water, there are clumps of felspar, quartz and clay.
The formation of felspar clusters due to agglomeration (clumping) of felspar particles can be stopped by the addition of clay to the mixing process which coats the felspar.
The suspension encapsulates and disperses the felspar, which is added next, preventing it from clumping together and resulting in over-fluxed areas in the fired clay body.
For example, porcelain clay bodies can be used on the wheel and for handbuilding operations, while filter pressing of the clay enhances wider firing ranges due to the consistent distribution of felspar throughout the clay mix.
While both G-200 and MC 200-K felspars are similar in many of their oxide components there are two differences worth noting.
Chemical Analysis Comparison of Custer, MC 200-K and G-200 felspars.
The blended felspars then became G-200 and were shipped throughout the United States.
Michael Wendt, President of Wendt Pottery, tested MC 200-K felspar in cone 10 porcelain clay body formulas and also tested individual samples of G-200, MC 200-K, and Custer felspars.