Feldspar (KAlSi₃O₈ / NaAlSi₃O₈ / CaAl₂Si₂O₈)

Flux mineral reducing melting temperatures in glass, ceramics, and tiles

01

Key industries

Glass

Glass

Ceramics

Ceramics

Tiles

Tiles

Fibre glass

Fibre Glass

Construction

Construction

02

Primary uses

  • Flux that lowers melting temperature in glass batches
  • Body and glaze flux in ceramics and tiles
  • Source of alumina and alkali oxides in industrial melts

Glass and ceramics

  • Supplies Al₂O₃ and alkali oxides to the melt
  • Improves workability and chemical durability of glass
  • Reduces firing energy in ceramic and tile production
03

Characteristics

  • Strong fluxing action versus silica
  • Controlled potash, soda, or mixed-alkali chemistry
  • Low iron for white-firing ceramic bodies

Glass and ceramics

  • Predictable melting behaviour in furnace and kiln
  • Improves hardness and weatherability of finished glass
04

Key properties

  • Aluminosilicate composition
  • Melts at lower temperatures than silica
  • Available as potash, soda, and mixed grades
  • Improves glass hardness and durability
  • Reduces energy demand in ceramic firing

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