Feldspar
Feldspar finds use in electrode manufacture it acts as a flux and forms slag, which protects molten metal from oxidation. For this, Potash feldspar having 13 to 14% of K 2 O, 1 to 3% of Na 2 O, 63 to 65% SiO 2, 17 to 20% of Al 2 O 3 and Fe 2 O 3 up to % is preferred. LOI should be maximum up to 1%. Size to