Feldspar Powder


Feldspar is a naturally occurring anhydrous, inorganic, igneous rock. It is a complex aluminum silicate-containing varying amounts of sodium, potassium, and calcium.

PreRish Tri produces Ceramic Grade Feldspar Powder.

Chemical Name:  Feldspar (CAS No. 68476-25-5)

General Category:  Tectosilicate

Chemical Formula:  KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8


Feldspar, orthoclase, albeit, anorthite, oligoclase, sodium/ potassium/calcium aluminum silicate feldspar, barbierite feldspar felt-spat, rhombic quartz

Chemical Properties:

  • Sodium ceramic grade
  • Potash ceramic grade
  • Sodium glass grade
  • Potash glass grade
  • Filler grade:
  1. Sodium ceramic grade, micronized
  2. Sodium filler grade, micronized

Physical Properties:

Various powder granulations 20 mesh x down, 40 mesh x down, 170 mesh x down, 200 mesh x down, and 250 mesh x down

Typical Applications:

Ceramic tiles, whiteware, glazes, glass, porcelain enamel frits, ceramics, filler, welding electrodes, and abrasives


Specific Gravity (g/cc) 2.60-2.65
Cleavage2 or 3
Loose Bulk Density (lbs/ft3)~ 37
Melting Point (°C)1200-1450°C
Boiling Point (°C) 
Surface Area (m2/g)~ 1.13
Thermal Conductivity (cal/s-cm-°C) 
Mohs6.0 – 6.5
Odor and AppearanceEarthy smell when wet
AppearancePink /White / Gray powder
pH~ 9.0