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Potassium & Sodium feldspar

Potassium feldspar

Sodium feldspar

Sodium feldspar chenmical formula is K₂O ? Al₂O₃ ? 6SiO₂, theoretical chemical compositions are SiO₂ 68.8%, Al₂O₃ 19.4%, Na₂O 11.8%, density is 2.61-2.64 g/cm³, Mohs hardness is 6-6.5, melting point is about 1100 ℃.

Characteristics

At high temperature, it can dissolve quartz, clay and mullite quickly and has high solubility

Low melting temperature, good transparency

The melting temperature range is narrower than K-feldspar. The viscosity of the melt is small at high temperature and changes rapidly with temperature

Technical Specifications

Specs.(%)	Guaranteed Value	Typical Value
S(%)	≤0.03	0.001
P(%)	≤0.03	0.005
SiO₂(%)	64.67	66.5
CaO(%)	0.64
TFe₂O₃(%)	≤1.0	0.13
Al₂O₃(%)	≥17	18.64
K₂O(%)	≤3	0.35
Na₂O(%)	≥10	11.3
100mesh	30-70	(30-35)
200mesh	5
－200mesh	30%