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What Is Sodium Feldspar — and How Does It Differ from Potash Feldspar?
Key facts about sodium feldspar:
- Chemical formula NaAlSi₃O₈ — an alkali alumino-silicate with Na₂O typically 9-11% depending on grade.
- Lower melt viscosity than potash feldspar — its defining commercial advantage, producing faster, more fluid, bubble-free melts.
- Primary uses: fast-fire glaze, enamel frit, container and sheet glass, and vitrified wall tile.
- Available in standard, high-flow, and high whiteness grades, mesh-graded 200/325, with Fe₂O₃ as low as <0.05% in glass-grade material.
- 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 Sodium Feldspar to 50+ Countries Since 1992 · www.feldsparindia.com
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REQUEST SODIUM FELDSPAR SAMPLE → VIEW FULL SPECIFICATIONSWhat Is Sodium Feldspar?
Sodium feldspar, also known as soda feldspar or albite, is a rock-forming mineral with the chemical formula NaAlSi₃O₈ — an alkali alumino-silicate mined, washed, and ground for use as a flux in ceramic and glass manufacturing. Its defining property is a lower melt viscosity than potassium feldspar: sodium feldspar begins melting at a lower temperature and flows more freely once molten, producing fast, uniform, low-bubble glass phases. This makes it the preferred flux wherever speed and flow matter more than a wide, forgiving firing range — fast-fire glaze cycles, enamel frit, and glass manufacturing.
Sodium Feldspar vs. Potassium Feldspar — Quick Comparison
| PROPERTY | SODIUM FELDSPAR | POTASSIUM FELDSPAR |
|---|---|---|
| Flux Oxide | Na₂O (9-11%) | K₂O (10-13%) |
| Melt Viscosity | Lower — faster flow | Higher — more controlled |
| Melting Range | Narrower, lower temperature | Wider, more forgiving |
| Best For | Fast-fire glaze, frit, glass | Porcelain, sanitaryware, bone china |
Properties, Uses & Grades of Sodium Feldspar
PROPERTY 01
Na₂O Content 9-11%
The flux value driving melt behaviour — 9-10% for standard wall tile and general glaze grades, 10-11% for fast-fire and glass-grade applications.
PROPERTY 02
Low Melt Viscosity for Fast, Uniform Flow
Produces a more uniform, bubble-free glass phase at faster firing cycles than potassium feldspar — the defining commercial advantage for glaze and glass work.
PROPERTY 03
Low Iron for Clear Glass & Premium Glaze
Glass-grade and high-whiteness sodium feldspar hold Fe₂O₃ below 0.05-0.10%, essential for colourless glass and bright, premium glaze work.
PROPERTY 04
Primary Industrial Uses
Fast-fire glaze, enamel frit, container and sheet glass, vitrified wall tile, and premium porcelain glaze layers.
PROPERTY 05
Standard Mesh Grades
200 mesh for general-purpose glaze and wall tile bodies; 325 mesh for vitrified tile, frit, and fast-fire glaze applications.
Sodium Feldspar Specification Reference
| GRADE | NA₂O | FE₂O₃ | MESH | APPLICATION |
|---|---|---|---|---|
| Standard 200M | 9.0-10.0% | <0.20% | 200M | Wall Tile · Glaze |
| Premium 325M | 9.5-10.5% | <0.15% | 325M | Vitrified Tile · Export |
| High-Flow / Glass Grade | 10.0-11.0% | <0.05-0.10% | 325M | Frit · Fast-Fire Glaze · Glass |
The Aalok Overseas Advantage — India's Trusted Sodium Feldspar Supplier
Mine-Direct from Rajasthan's Aravalli Belt
Extraction, washing, milling, and mesh grading controlled in-house from Aalok Overseas' own Rajasthan deposits — not blended trader stock.
Full Grade Range
Standard, high-flow, and high whiteness sodium feldspar, mesh-graded 200/325, matched to every application from wall tile to clear glass.
NABL COA on Every Shipment
Na₂O, Fe₂O₃, TiO₂, LOI, and sieve analysis verified per lot — not a one-time sample — so your melt performance stays predictable shipment after shipment.
Three Decades of Export Experience
Manufacturing and exporting sodium feldspar since 1992, with established shipping routes to 50+ countries via Mundra and Kandla.
Why Manufacturers Choose Aalok Overseas
Melt speed and flow consistency define good sodium feldspar — and both depend entirely on chemistry and mesh grading staying stable, lot after lot. Aalok Overseas' mine-direct control and NABL-verified documentation on every shipment are why ceramic and glass manufacturers across 50+ countries trust Aalok Overseas sodium feldspar for their fast-fire and premium glaze work.
FAQ — Sodium Feldspar
Q
What is sodium feldspar used for?
Sodium feldspar is used as a flux in fast-fire glaze, enamel frit, container and sheet glass, and vitrified wall tile, valued for its low melt viscosity and fast, uniform flow.
Q
What is the difference between sodium feldspar and albite?
Albite is the mineralogical name for the sodium-rich feldspar (NaAlSi₃O₈). "Sodium feldspar" and "soda feldspar" are the commercial terms for the same mineral used in industry.
Q
What Na₂O percentage should I look for in sodium feldspar?
9.0-10.0% is adequate for standard wall tile and general glaze applications; 10.0-11.0% is preferred for fast-fire glaze, frit, and glass manufacturing where melt speed matters most.
Q
Why does sodium feldspar melt at a lower temperature than potassium feldspar?
Sodium ions create a less viscous glass network than potassium ions at equivalent temperatures, giving sodium feldspar its characteristic lower melt viscosity and faster flow.
Q
How do I verify sodium feldspar quality before ordering in bulk?
Request a free sample with a NABL-accredited XRF COA showing Na₂O, Fe₂O₃, TiO₂, LOI, and mesh grading, and fire a trial batch to compare melt flow and whiteness against your reference standard.
Related Guides
REQUEST SODIUM FELDSPAR SAMPLE · NABL COA · FULL CHEMISTRY DATA
Contact Aalok Overseas — India's Best Quality Sodium Feldspar Supplier
Request free samples of standard, high-flow, or high-whiteness sodium feldspar with NABL-certified COA and MSDS. Mine-direct sourced from Rajasthan since 1992, exported to 50+ countries.
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