Feldspar
Industrial Strength. Consistent Grade
Didwaniya Group supplies premium-grade feldspar, sourced and processed to meet stringent industrial specifications for glass, ceramics, and filler applications. Our feldspar offers consistent chemical composition, controlled particle size distribution, and superior batch-to-batch uniformity — trusted by manufacturers worldwide for performance and purity.
Feldspar is a family of rock-forming tectosilicate minerals that make up a large portion of the Earth’s crust. The group is broadly classified into alkali feldspars (potassium-rich, e.g., orthoclase) and plagioclase feldspars (sodium-calcium series). Feldspars are typically white, pink, gray or cream in appearance and occur as hard, crystalline grains. Their robustness, chemical stability, and fluxing behaviour under heat make them essential raw materials for many industrial processes.
Industrial feldspar is beneficiated and milled to specific sizes and grades depending on end-use requirements. Quality control focuses on chemical composition (notably Al₂O₃ and silica content), low levels of iron and contaminants, and tight particle-size distributions. Didwaniya Group’s feldspar batches undergo rigorous testing to ensure they meet customer specs for brightness, chemical stability and thermal behaviour — delivering reliable feedstock for glass and ceramic manufacturers as well as for applications requiring inert fillers.
Characteristics
Chemical system / formula: Framework tectosilicates (typical end-members include KAlSi₃O₈ for alkali feldspar and NaAlSi₃O₈–CaAl₂Si₂O₈ for plagioclase).
Group: Alkali feldspars and plagioclase feldspars (commercial product usually described by grade and chemistry).
Appearance (structure): Crystalline grains, typically white, pink, gray or cream; may be supplied as coarse lumps, crushed grains or milled powder.
Mohs hardness: ~6.0 – 6.5.
Specific gravity: ≈ 2.55 – 2.76 (depends on composition).
Typical industrial composition: High silica and alumina content with controlled iron and alkali levels (exact specs provided per grade).
Particle size: Supplied in various mesh/powder sizes according to application (custom sieving or micronized grades available).
Impurities: Low iron and minimal clay content are preferred for high-brightness glass and ceramic grades; Didwaniya provides lab certificates for impurity levels.
Application
Feldspar serves as a vital fluxing agent in glass and ceramics production — lowering melting temperatures and improving the strength, translucency and workability of finished products. It is widely used in the manufacture of flat glass, container glass, sanitaryware and porcelain. Beyond glass and ceramics, feldspar is used as an industrial filler and extender in paints, plastics, rubber and adhesives to enhance hardness, durability and dimensional stability. Specialized grades are used in frits, glazes, and other formulated mineral products where controlled chemical composition and particle size are critical.
Storage Condition
Store feldspar in clean, dry, well-ventilated warehouses on raised pallets or in sealed silos/bins to prevent moisture pickup and contamination. Keep separate by grade to avoid cross-mixing and maintain traceability; protect against excessive humidity, salt exposure, and foreign matter. Maintain ambient temperatures and relative humidity conditions that prevent caking and preserve particle flow for handling and transport.