Feldspar

Feldspar is a widely used industrial mineral known for its excellent fluxing properties, chemical stability, and ability to improve product strength and surface finish. It is primarily composed of aluminum silicates combined with potassium, sodium, or calcium, making it an essential raw material in industries such as ceramics, glass manufacturing, construction, paints, plastics, rubber, and adhesives. In ceramic and glass applications, feldspar lowers the melting temperature of raw materials, enhances vitrification, improves hardness, and provides a smooth, glossy finish. Its low iron content and consistent particle size make it especially suitable for high-quality tiles, sanitaryware, tableware, and specialty glass.

In addition to ceramics and glass, feldspar is used as a functional filler in paints, plastics, and rubber to improve durability, abrasion resistance, and chemical stability. Carefully processed feldspar ensures controlled composition, uniform granulation, and reliable performance in manufacturing processes.

Feldspar – Technical Specifications

Parameter Specification
Chemical Composition Alumino-silicate (KAlSi₃O₈ / NaAlSi₃O₈ / CaAl₂Si₂O₈)
Type Potash Feldspar / Soda Feldspar
Al₂O₃ Content 16% – 20%
SiO₂ Content 65% – 75%
Na₂O + K₂O 9% – 14%
Fe₂O₃ ≤ 0.5% (low iron grade)
Color White / Off-white
Mohs Hardness 6
Specific Gravity 2.55 – 2.65
Melting Point 1100°C – 1250°C
Moisture Content ≤ 0.5%
Water Absorption Negligible
Particle Size Range 100 mesh – 10 mm (customizable)
Bulk Density 1.3 – 1.5 g/cm³
Packaging 25 kg / 50 kg bags or jumbo bags
Applications Ceramics, Glass, Tiles, Sanitaryware, Paints, Plastics