Ceramic Glaze Soda Feldspar

K2o na2o evaluation substitution rules vs.

Ceramic glaze soda feldspar. Pure soda feldspar minspar 200 fired like a glaze at cone 4 5 6 and 7 on porcelainous stoneware samples. Which are true mineral names. The potassium fluxes include. Potassium fluxed glazes have greater durability than soda fluxed glazes.

Quantity discounts are available. Potash feld spars custer g 200 k200 and primas p no longer available are buckingham oxford yankee clinchfield 202 key stone maine madoc h a 3 and el brook. In many cases soda and potash feldspar are interchangeable in glaze recipes. However some differences will be apparent.

The bottom samples are balls that have melted down at cone 7 and 8. Also serious crazing is highlighted on the cone 6 sample it is also happening at cone 5 and 7. 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. Using digitalfire insight to formulate fix and adjust ceramic glazes.

Feldspar one of the most common materials found in glazes can be classified into three groups. Crystalline minerals made up of mainly silica and alumina in combination with sodium and potassium oxides. Potash feldspars such as custer and g 200. F4 is no longer availab.

Sodium feldspars kona f 4 nepheline syenite 270x nepheline sy enite 400x. Issues surrounding substitution with complex materials knao vs. Feldspars used in ceramic glazes and clay making. Quantity discounts are available.

Contains mainly potassium but also has sodium and calcium. Feldspar is an important ingredient in clay bodies and glazes. A soda feldspar cone 4 7. In both applications they provide additional alumina al2o3 and silica sio2.

Potassium is preferred for high fire glazes. Custer feldspar nako al2o3 6sio2 is a one of the primary feldspars. Notice there is no melting at all at cone 4. Often considered a natural frit.

Nepheline syenite is actually a rock composed of potash and soda feldspars plus the mineral nepheline a sodium.