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What Is Potassium Feldspar — Properties, Uses, Grades and Best Supplier in India?
Key facts about potassium feldspar:
- Chemical formula KAlSi₃O₈ — an alkali alumino-silicate with K₂O typically 10-13% depending on grade.
- Wide, forgiving melting range — its defining commercial advantage over sodium feldspar, allowing precise vitrification control in porcelain and bone china.
- Primary uses: porcelain, sanitaryware, vitrified/bone china tableware, vitrified floor tile, electrical porcelain, and glass manufacturing.
- Available in standard, premium, and high whiteness grades, mesh-graded to 200/325, with Fe₂O₃ as low as <0.03-0.04% in ultra-white grades.
- Best sourced mine-direct with NABL COA per shipment — Aalok Overseas controls extraction, washing, and grading in-house from its own Rajasthan operations.
Source: Aalok Overseas Technical Laboratory, Rajasthan, India · Manufacturer & Exporter of Potassium Feldspar to 50+ Countries Since 1992 · www.feldsparindia.com
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REQUEST POTASSIUM FELDSPAR SAMPLE → VIEW FULL SPECIFICATIONSWhat Is Potassium Feldspar?
Potassium feldspar, also known as potash feldspar or orthoclase, is a rock-forming mineral with the chemical formula KAlSi₃O₈ — an alkali alumino-silicate belonging to the feldspar mineral group. It forms in igneous and metamorphic rocks, particularly pegmatites, and is mined, washed, and ground into a fine powder for industrial use as a flux. Its defining property is a wide, controlled melting range: unlike sodium feldspar, which flows quickly at lower temperatures, potassium feldspar melts more gradually across a broader temperature window, letting fired ceramic pieces reach full vitrification while holding their shape rather than slumping or deforming.
Properties, Uses & Grades of Potassium Feldspar
PROPERTY 01
K₂O Content 10-13%
The flux value that determines melt behaviour — 10-11.5% for standard wall tile grades, 11.5-13% for porcelain and premium export grades.
PROPERTY 02
Wide Vitrification Range
Compared to sodium feldspar's fast, low-viscosity melt, potassium feldspar melts more gradually, giving porcelain and sanitaryware more forgiving firing tolerance.
PROPERTY 03
Low Iron for Whiteness-Sensitive Uses
Premium and ultra-white grades hold Fe₂O₃ below 0.04-0.06%, essential for bone china, premium sanitaryware, and export porcelain.
PROPERTY 04
Primary Industrial Uses
Porcelain, sanitaryware, bone china, vitrified floor tile, electrical porcelain/insulators, enamel frit, and glass manufacturing.
PROPERTY 05
Standard Mesh Grades
200 mesh for general wall tile bodies; 325 mesh for porcelain, sanitaryware, and export-grade applications requiring finer, more complete melt.
Potassium Feldspar Specification Reference
| GRADE | K₂O | FE₂O₃ | MESH | APPLICATION |
|---|---|---|---|---|
| Standard 200M | 10.0-11.5% | <0.15% | 200M | Wall Tile · Domestic |
| Premium 325M | 11.5-13.0% | <0.06% | 325M | Porcelain · Export · Frit |
| Ultra White | 12.0-13.0% | <0.04% | 325M | Sanitaryware · Bone China |
The Aalok Overseas Advantage — India's Trusted Potassium Feldspar Supplier
Mine-Direct from Rajasthan's Aravalli Belt
Extraction, washing, milling, and mesh grading controlled in-house from Aalok Overseas' own Ajmer-region deposits — not blended trader stock.
Full Grade Range
Standard, premium, and ultra-white potassium feldspar, mesh-graded 200/325, matched to every application from domestic wall tile to bone china.
NABL COA on Every Shipment
K₂O, Fe₂O₃, TiO₂, LOI, and sieve analysis verified per lot — not a one-time sample — so your recipe stays matched to your raw material.
Three Decades of Export Experience
Manufacturing and exporting potassium feldspar since 1992, with established shipping routes to 50+ countries via Mundra and Kandla.
Why Manufacturers Choose Aalok Overseas
Consistency, not just chemistry on paper, is what defines a reliable potassium feldspar supplier. Aalok Overseas' mine-direct control, decades of processing experience, and NABL-verified documentation on every shipment are why ceramic manufacturers across 50+ countries trust Aalok Overseas potassium feldspar for their most demanding porcelain and sanitaryware bodies.
FAQ — Potassium Feldspar
Q
What is potassium feldspar used for?
Potassium feldspar is used as a flux in porcelain, sanitaryware, bone china, vitrified floor tile, electrical porcelain, enamel frit, and glass manufacturing, valued for its wide, controlled melting range.
Q
What is the difference between potassium feldspar and orthoclase?
Orthoclase is the mineralogical name for the potassium-rich feldspar (KAlSi₃O₈). "Potassium feldspar" and "potash feldspar" are the commercial terms for the same mineral used in industry.
Q
What K₂O percentage should I look for in potassium feldspar?
10.0-11.5% is adequate for standard wall tile, 11.5-12.5% for porcelain and export tile, and 12.0-13.0% for premium sanitaryware and bone china requiring maximum whiteness and firing precision.
Q
Where is the best quality potassium feldspar sourced from in India?
Rajasthan, particularly Ajmer district within the Aravalli mineral belt, is India's leading potassium feldspar-producing region, supplying the large majority of the country's output.
Q
How do I verify potassium feldspar quality before ordering in bulk?
Request a free sample with a NABL-accredited XRF COA showing K₂O, Fe₂O₃, TiO₂, LOI, and mesh grading, and fire a trial batch to compare against your reference standard before committing to bulk order.
Related Guides
REQUEST POTASSIUM FELDSPAR SAMPLE · NABL COA · FULL CHEMISTRY DATA
Contact Aalok Overseas — India's Best Quality Potassium Feldspar Supplier
Request free samples of standard, premium, or ultra-white potassium feldspar with NABL-certified COA and MSDS. Mine-direct sourced from Rajasthan since 1992, exported to 50+ countries.
Aalok Overseas · Rajasthan, India · Manufacturer & Exporter of Feldspar, Quartz Powder & Kaolin Since 1992
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