Product

Feldspar

Feldspar

In ceramic bodies, the main vitrifying (fluxing) agent is feldspar. The majority of white ware bodies contain good proportions of feldspar. It acts as a flux. In the ceramic industry, the flux is defined as that portion of the body which develops glass phase. This is provided mostly by feldspar. The amount of flux in a ceramic body should be only in such a proportion as to develop the desired amount of vitrification. If excess of flux is added, the fired body becomes very glassy and consequently, brittle.

Types of Feldspar

Soda Feldspar

Soda Feldspar is generally a clean white mineral that sources sodium, alumina and silica along with some potassium and ohter mineral.They all have some K2O and small amounts of other contaminants.

Basically, the two properties which make feldspars useful for downstream industries are their alkali and alumina content. Feldspars play an important role as fluxing agents in ceramics and glass applications, and also are used as functional fillers in the paint, plastic, rubber and adhesive industries.

Potash Feldspar

The name of “Feldspar” refers to group of Aluminum Silicate of potassium, sodium and calcium. Potassium feldspar refers to a number of minerals in the feldspar group, and containing potassium: Orthoclase (endmember formula KAlSi3O8), an important tectosilicate mineral that forms igneous rock.

Basically, the two properties which make feldspars useful for downstream industries are their alkali and alumina content. Feldspars play an important role as fluxing agents in ceramics and glass applications, and also are used as functional fillers in the paint, plastic, rubber and adhesive industries.

Specification of Soda Feldspar

Parameters SF-6 SF-8
L-value 84-85% 84-85%
a-value <1 <1
b-value 5-6 5-6
SiO2 72% (± 1%) 69% (± 2%)
Al2O3 16% (± 1%) 18% (± 2%)
Na2O 6% (± 1%) 8% (± 1%)
K2O 0.7% (± 0.5%) 0.4% (± 1%)
TiO2 Trace Trace
Cao <0.9% (± 0.05%) <0.9% (± 0.05%)
Mgo Trace Trace
Fe2O3 <0.4% (± 0.05%) <0.4% (± 0.05%)
LOI (Loss on Ignition) 0.6% 0.7%

Application of Soda Feldspar

  • Glass
  • Ceramic
  • Filler
  • Enamel
  • Frit
  • Glaze
  • Abrasive
  • Porcelain & Earthenware

Specification of Potash Feldspar

Parameters PF-4 PF-5
SiO2 72% (± 1%) 71% (± 1%)
Al2O3 18% (± 1%) 17% (± 1%)
K2O 4% 5%
Na2O 4% 3%
TiO2 Trace Trace
Cao <0.6% <0.8%
Mgo Trace Trace
Fe2O3 0.35%(± 0.05%) 0.4%(± 0.05%)
LOI (Loss on Ignition) 0.5% 0.5%

Application of Potash Feldspar

  • Glass
  • Ceramic
  • Filler
  • Enamel
  • Frit
  • Glaze
  • Abrasive
  • Welding Electrode