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Posted by Admin on May, 02, 2026
Potash Feldspar · Potassium Feldspar
K-Feldspar · Orthoclase · Microcline
https://www.feldsparindia.com/potassium-feldspar.htm
India's trusted manufacturer, supplier & bulk exporter of high-purity Potash Feldspar (K-Feldspar / Orthoclase / Microcline) for ceramics, bone china, glass, electrical porcelain, tiles, sanitaryware, paints & specialty industries worldwide.
What is Potash Feldspar? (पोटाश फेल्डस्पार | Feldspato Potásico | Kalifeldspar)
Potash Feldspar — scientifically known as Orthoclase or Microcline (KAlSi₃O₈) — is the potassium-rich end member of the alkali feldspar series and one of the most commercially significant industrial minerals on earth. Aalok Overseas India is a leading manufacturer, processor, and bulk exporter of premium K-Feldspar sourced from the prolific mineral belts of Rajasthan and beyond.
With a chemical formula of KAlSi₃O₈, Potash Feldspar (also written as K-Spar or K-Feldspar) is distinguished by its high potassium oxide (K₂O) content, elevated alumina (Al₂O₃), low iron oxide, and excellent whiteness. These properties make it the preferred raw material for bone china, high-voltage electrical insulators, vitrified tiles, glass, and countless specialty industrial applications.
At Aalok Overseas India, we mine, beneficiate, magnetically separate, grind, and supply potash feldspar in a wide range of grades and particle sizes — from raw lumps and chips to ultra-fine 1250 mesh powder — precisely engineered to your manufacturing requirements.
Did You Know? Potash Feldspar produces a more viscous glassy phase at sintering temperatures compared to Sodium Feldspar, making it uniquely suited for bone china, high-tension electrical porcelain, and applications where controlled deformation during firing is critical. This viscosity difference is the single most important reason many premium ceramic manufacturers specify K-Feldspar over soda feldspar.
Types of Potash Feldspar — Orthoclase, Microcline & Sanidine
The term "Potash Feldspar" encompasses several polymorphs of KAlSi₃O₈, each with the same chemical composition but different crystal structures formed under different geological conditions. Understanding these distinctions helps buyers select the most appropriate grade:
| Mineral Name | Crystal System | Formation | Typical K₂O% | Industrial Use |
|---|---|---|---|---|
| Orthoclase | Monoclinic | Granites, pegmatites, syenites | 14–16% | Ceramics, glass, tiles, glazes |
| Microcline | Triclinic | Granitic pegmatites (low-T) | 14–16% | Bone china, electrical porcelain, abrasives |
| Sanidine | Monoclinic | Volcanic rocks (rapid cooling) | 12–15% | Specialty glass, research ceramics |
| Adularia | Monoclinic | Low-T hydrothermal veins | 13–15% | Gemstones (moonstone), specialty |
| Perthite | Intergrowth | Mixed Na/K unmixing in pegmatites | Varies | Industrial ceramics, glass batch |
Commercially, Orthoclase and Microcline are the two primary potash feldspars supplied by Aalok Overseas. Our Rajasthan and Andhra Pradesh sources yield both varieties, and we can supply to specific K₂O targets depending on the mineralogy of the deposit being mined.
Chemical Composition & Technical Specifications
All Aalok Overseas Potash Feldspar is tested by XRF (X-Ray Fluorescence) analysis in our in-house laboratory. Each shipment is accompanied by a full Certificate of Analysis (COA). Typical specifications for our commercial grades are:
| Parameter | Standard Grade | Premium Grade | Ultra-White Grade | Bone China Grade | Electrical Porcelain Grade |
|---|---|---|---|---|---|
| SiO₂ (Silica) | 63–66% | 64–67% | 63–65% | 63–65% | 63–66% |
| Al₂O₃ (Alumina) | 18–20% | 19–21% | 20–22% | 20–22% | 20–22% |
| K₂O (Potassium Oxide) | 9–11% | 10–12% | 11–13% | 11–13% | 12–14% |
| Na₂O (Sodium Oxide) | 1.5–3.0% | 1.0–2.5% | <1.5% | <1.0% | <1.0% |
| Fe₂O₃ (Iron Oxide) | <0.25% | <0.15% | <0.10% | <0.10% | <0.12% |
| TiO₂ (Titanium Oxide) | <0.10% | <0.08% | <0.05% | <0.05% | <0.06% |
| CaO (Calcium Oxide) | <1.5% | <1.0% | <0.8% | <0.5% | <0.8% |
| MgO (Magnesium Oxide) | <0.12% | <0.10% | <0.06% | <0.05% | <0.06% |
| LOI (Loss on Ignition) | <1.0% | <0.8% | <0.6% | <0.5% | <0.6% |
| Whiteness (Hunter Lab) | 72–80% | 80–87% | 87–92% | 88–93% | 85–90% |
| Specific Gravity | 2.55 – 2.63 g/cm³ | ||||
| Mohs Hardness | 6.0 – 6.5 | ||||
| Melting / Fusion Point | 1150°C – 1200°C | ||||
Available Mesh Sizes & Particle Grades
| Mesh Size | Micron (µm) | Typical Application | Packing |
|---|---|---|---|
| 20 – 40 Mesh | 425–850 µm | Glass batch, abrasives, electrode coating | 50 kg PP Bags / Big Bags |
| 60 – 80 Mesh | 180–250 µm | Ceramic body, floor tiles | 50 kg PP Bags / Big Bags |
| 100 – 150 Mesh | 106–150 µm | Bone china, fine ceramics | 50 kg Laminated Bags |
| 200 Mesh | 74 µm | Sanitaryware, wall tiles, engobes | 50 kg PP / HDPE Bags |
| 325 Mesh | 44 µm | Glazes, vitrified tiles, electrical porcelain | 25 / 50 kg HDPE Bags |
| 500 Mesh | 25 µm | Paints, coatings, rubber compounds | 25 kg Paper / PE Bags |
| 800 – 1250 Mesh | 10–20 µm | Specialty technical ceramics, cosmetics | 25 kg Valve Bags |
| Lumps / Chips | 10–75 mm | Glass plants, direct grinding feed | Bulk / Jumbo Bags / Loose |
Industries That Use Potash Feldspar
Potash Feldspar is one of the most versatile industrial minerals in the world. Its unique combination of high-temperature viscosity, low iron content, elevated alumina, and consistent K₂O makes it irreplaceable across the following industries — listed with their names in multiple world languages:
Ceramic Industry
सिरेमिक उद्योग (Hindi) · Industrie céramique (FR) · Industria Ceramica (IT/ES) · Seramik Sektörü (TR) · Keramische Industrie (DE) · 陶瓷行业 (ZH) · सेरामिक उद्योग (Marathi)
The largest global consumer of potash feldspar. Used as a primary flux in ceramic body formulations for floor tiles, wall tiles, vitrified tiles, stoneware, earthenware, and porcelain. Lowers firing temperature while improving mechanical strength, translucency, and density.
Bone China & Fine China Industry
बोन चाइना उद्योग (Hindi) · Bone China (FR/DE/ES) · 骨瓷行业 (ZH) · Bone China Sektörü (TR) · Bone China Industria (IT) · ボーンチャイナ (JA) · 본차이나 (KO)
Potash Feldspar is essential in bone china body formulations, contributing to the characteristic translucency, whiteness, and strength. Its more viscous glassy phase at firing temperatures prevents deformation and is critical in achieving the delicate, thin-walled aesthetics of fine china tableware.
Electrical Porcelain & Insulators
विद्युत पोर्सेलेन (Hindi) · Porcelaine Électrique (FR) · Elektroporzellan (DE) · Porcelana Eléctrica (ES) · 电气瓷 (ZH) · Elektrik Porselen (TR) · Porcellana Elettrica (IT)
High-K₂O potash feldspar is the preferred mineral for manufacturing high-voltage insulators, spark plug bodies, switchgear components, bushing insulators, and electrical substations porcelain. The viscous glassy phase provides superior dielectric strength and dimensional stability.
Glass & Glassware Industry
कांच उद्योग (Hindi) · Glasindustrie (DE) · Industrie du Verre (FR) · Industria del Vidrio (ES) · 玻璃行业 (ZH) · Cam Sektörü (TR) · Industria del Vetro (IT)
K-Feldspar introduces alumina and potassium oxide into glass batches, improving chemical durability, scratch resistance, refractive index, and viscosity at working temperatures. Used in container glass, flat glass, tableware glass, crystal glass, and technical specialty glass.
Sanitaryware Industry
सेनेटरीवेयर (Hindi) · Sanitärkeramik (DE) · Artículos Sanitarios (ES) · Produits Sanitaires (FR) · 卫浴洁具 (ZH) · Sağlık Gereçleri (TR) · Sanitari (IT)
High-purity, ultra-white potash feldspar is a key body ingredient in vitreous china products — WC pans, washbasins, cisterns, urinals, and bathtubs. Ensures complete vitrification, zero water absorption, superior whiteness, and mechanical durability.
Floor & Vitrified Tile Industry
टाइल उद्योग (Hindi) · Industrie des Carreaux (FR) · Fliesenindustrie (DE) · Industria de Azulejos (ES) · 瓷砖行业 (ZH) · Fayans Sektörü (TR) · Industria Piastrelle (IT)
One of the largest consumers of potash feldspar globally. Used in the body composition of double-charge vitrified tiles, full-body vitrified tiles, and GVT/PGVT tiles. Controls the glass phase development during firing for optimal mechanical strength and low porosity.
Paints, Coatings & Primers
पेंट उद्योग (Hindi) · Industrie des Peintures (FR) · Farben & Lacke (DE) · Pintura (ES) · 涂料行业 (ZH) · Boya Endüstrisi (TR) · Vernici e Pitture (IT)
Ultra-fine micronized potash feldspar acts as a functional extender pigment and filler in architectural paints, industrial protective coatings, wood primers, and powder coatings. Improves scrub resistance, hiding power, and cost efficiency.
Enamel, Frit & Glaze Industry
इनेमल उद्योग (Hindi) · Email-Industrie (DE) · Émaux (FR) · Esmaltes (ES) · 搪瓷釉料行业 (ZH) · Emaye (TR) · Smalti e Fritte (IT)
K-Feldspar is a major component in ceramic frit manufacturing, glaze formulations, and enamel coatings. The potassium flux produces a glossier, more durable glaze surface compared to sodium-based alternatives, and is favoured in high-end tile glazing and tableware enamels.
Rubber & Plastics Industry
रबर उद्योग (Hindi) · Gummi-Industrie (DE) · Industrie du Caoutchouc (FR) · Industria del Caucho (ES) · 橡胶塑料行业 (ZH) · Kauçuk (TR) · Gomma e Plastica (IT)
Micronized potash feldspar serves as an inert reinforcing filler in natural rubber, synthetic rubber (SBR, NBR), PVC, and thermoplastic formulations. Improves hardness, tear resistance, dimensional stability, and reduces compound cost.
Abrasives & Grinding Industry
अपघर्षक उद्योग (Hindi) · Schleifmittel (DE) · Abrasifs (FR) · Abrasivos (ES) · 研磨材料 (ZH) · Aşındırıcılar (TR) · Abrasivi (IT)
Coarser grades of potash feldspar (Mohs 6.0–6.5) are used in industrial abrasive blasting, surface preparation, bonded abrasives, and abrasive paper manufacturing. Feldspar is preferred over silica sand in certain applications due to lower free-silica content and reduced health risk.
Cosmetics & Personal Care
सौंदर्य उद्योग (Hindi) · Kosmetikindustrie (DE) · Industrie Cosmétique (FR) · Cosmética (ES) · 化妆品行业 (ZH) · Kozmetik Sektörü (TR) · Cosmetica (IT)
Ultra-pure, micronized potash feldspar powder (1000–1250 mesh) is used in face powders, mineral foundations, eyeshadows, and body powders. Its natural mineral origin, chemical inertness, soft feel, and excellent coverage properties make it a preferred ingredient in natural and mineral cosmetics.
Construction & Building Materials
निर्माण उद्योग (Hindi) · Bauindustrie (DE) · Construction (FR) · Construcción (ES) · 建筑材料行业 (ZH) · İnşaat (TR) · Edilizia (IT)
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