REFSAN SODIUM FELDSPAR
REFSAN SODIUM FELDSPAR
RAW MATERIALS AND OXIDES

REFSAN SODIUM FELDSPAR (5137)

Brand : REFSAN
Price : 7,38TL
ÇOKALAZÖDE BOYA

SODIUM FELDSPAR

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.

 

  
CHEMICAL ANALYSIS

 

A.Z.

(%)

Si02

(%)

Ab03

(%)

Fe203

(%)

Ti02

(%)

CaO

(%)

MgO

(%)

Na20

(%)

K20

(%)

0,50

± 0,20

70,00

± 1,00

18,00

± 0,50

0,06

± 0,02

0,11

± 0,02

0,50

± 0,30

0,20

± 0,10

10,00

± 0,50

0,40

± 0,10

  

    GRAIN SIZE

+74 µm  = 1,00 %

 

+63 µm  = 5,00 %

  

MOISTURE

0,20 max.