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What Is the Best Quality Sodium Feldspar Powder — and Who Supplies It?
The 5 markers of best quality sodium feldspar powder:
- Check Na₂O content 9-11% — this is the flux value that drives melt behaviour and firing performance.
- Verify Fe₂O₃ below 0.10-0.12% — low iron content is essential for whiteness and colour consistency in the fired body.
- Confirm 200/325 mesh grading — consistent particle size ensures predictable, repeatable melt and shrinkage behaviour.
- Request LOI below 0.4-0.6% — low loss-on-ignition means minimal gas release and stable firing performance.
- Demand a NABL-accredited XRF COA on every shipment — the only reliable way to verify quality lot to lot, not just on a sample.
Source: Aalok Overseas Technical Laboratory, Rajasthan, India · Manufacturer & Exporter of Premium Sodium Feldspar Powder to 50+ Countries Since 1992 · www.feldsparindia.com
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AALOK OVERSEAS INDIA · RAJASTHAN · FELDSPAR DIVISION · PRODUCT GUIDE
Na₂O Flux Content · Low Iron · 200/325 Mesh · Low LOI · NABL COA · Ceramic & Glass Grade · 50+ Countries · Exporter Since 1992
Published: July 2026 | Author: Aalok Overseas Technical Team | Category: Ceramic & Glass Raw Materials
REQUEST SODIUM FELDSPAR SAMPLE → VIEW FULL SODIUM FELDSPAR SPECSWhat Is Sodium Feldspar Powder — and Why Does Quality Matter?
Sodium Feldspar Powder (also called soda feldspar or albite) is a naturally occurring mineral, NaAlSi₃O₈, ground and graded for use as a flux in ceramic tile bodies, sanitaryware, glazes, frit, and glass manufacturing. Compared to potassium feldspar, sodium feldspar has a lower melt viscosity — meaning it flows more freely at lower temperatures, producing faster, more uniform glazes and bubble-free glass melts. The quality of the raw powder — its Na₂O content, iron level, mesh grading, and lot-to-lot consistency — directly determines melt behaviour, whiteness, and firing performance downstream. No amount of process adjustment in the kiln can compensate for an inconsistent or impure feldspar lot.
Sodium Feldspar Quality Standards by Application
| APPLICATION | NA₂O REQUIRED | FE₂O₃ TARGET | MARKET / STANDARD |
|---|---|---|---|
| Fast-Fire Glaze & Frit | 10.0-11.0% | <0.12% | Manufacturer specification |
| Vitrified Wall Tile | 9.5-10.5% | <0.15% | ISO 13006, SNI, TCVN |
| Standard Wall Tile — Domestic | 9.0-10.0% | <0.20% | IS 15622, SNI domestic |
| Container & Sheet Glass | 9.5-11.0% | <0.10% | ASTM C162, IS 2835 |
| Enamel Frit | 10.0-11.0% | <0.10% | Manufacturer specification |
| Sanitaryware Glaze | 9.5-10.5% | <0.10% | ISO, EN, JIS B 1082 |
8 Markers of Best Quality Sodium Feldspar Powder — What to Verify Before You Buy
MARKER 01 — MOST IMPORTANT
Na₂O Content 9-11% — The Core Flux Value
Na₂O is the flux oxide that gives sodium feldspar its defining low-viscosity melt. Below 9%, the material behaves more like a low-grade filler than a true flux, requiring higher firing temperatures to achieve the same vitrification. Aalok Overseas Sodium Feldspar consistently delivers Na₂O 9.0-11.0% depending on grade, verified on every shipment's XRF COA.
MARKER 02 — WHITENESS CRITICAL
Low Fe₂O₃ (Iron Oxide) Below 0.10-0.15%
Iron oxide is the single most damaging impurity for whiteness and colour consistency in glaze and glass applications. Standard-grade sodium feldspar can carry Fe₂O₃ as high as 0.25-0.30%, producing a visibly cream or grey-tinted result. Premium sodium feldspar holds Fe₂O₃ below 0.12%, and Aalok Overseas' high-flow grade below 0.10%.
MARKER 03 — CONSISTENCY
Consistent 200/325 Mesh Grading
Particle size determines how completely and how quickly the flux melts within a firing cycle. Coarse or inconsistently graded material melts unevenly, leaving unmolten grains that create both visual defects and unpredictable shrinkage. Best-quality sodium feldspar is graded to a tight 200 or 325 mesh band and held consistent lot to lot.
MARKER 04 — FIRING STABILITY
Low LOI (Loss on Ignition) Below 0.4-0.6%
LOI reflects bound water, carbonates, and organic content that release gas during firing. High LOI introduces unpredictable variability into melt timing and can cause pinholing or blistering in glazes. Best-quality sodium feldspar keeps LOI low and stable, verified on every COA.
MARKER 05 — PURITY
Low TiO₂ (Titanium Dioxide) Below 0.02-0.03%
Titanium dioxide causes a blue-grey tint distinct from iron's yellow tint, and is equally damaging in premium white glaze and clear glass applications. Best-quality sodium feldspar is sourced from deposits low in accessory titanium-bearing minerals and verified by XRF.
MARKER 06 — MELT BEHAVIOUR
Low Melt Viscosity for Fast, Uniform Flow
The defining commercial advantage of sodium feldspar over potassium feldspar is its lower melt viscosity, producing a more uniform, bubble-free glass phase at faster firing cycles. This property is directly tied to Na₂O purity and consistency — inconsistent flux content produces inconsistent flow, undermining the very reason sodium feldspar is chosen.
MARKER 07 — DOCUMENTATION
NABL-Accredited XRF COA on Every Shipment
A one-time sample analysis does not guarantee bulk shipment quality. Best-quality sodium feldspar suppliers provide a NABL-accredited Certificate of Analysis with full XRF breakdown (Na₂O, Fe₂O₃, TiO₂, SiO₂, Al₂O₃, LOI) on every single shipment, not just on request.
MARKER 08 — SUPPLY RELIABILITY
Mine-Direct Sourcing for Batch-to-Batch Consistency
Traders who blend feldspar from multiple mine zones and multiple suppliers cannot guarantee consistency between shipments. Mine-direct manufacturers who control extraction, beneficiation, milling, and grading in-house — like Aalok Overseas — deliver the batch-to-batch consistency that defines genuinely best-quality material.
Sodium Feldspar Sourcing Problem — Symptom → Cause → Fix
| SYMPTOM OBSERVED | PROBABLE CAUSE | RECOMMENDED FIX |
|---|---|---|
| Glaze fires cream or yellow-tinted | Fe₂O₃ above 0.15-0.20% in feldspar | Switch to Fe₂O₃ <0.12% high-flow grade; verify XRF COA |
| Unmelted grains visible in fired glaze | Coarse or inconsistent mesh grading | Specify 200/325 mesh grading; request per-lot sieve data |
| Melt flow inconsistent batch to batch | Na₂O content varies lot to lot | Demand NABL COA per shipment; reject outside ±0.3% band |
| Pinholing or blistering in fired glaze | High LOI causing gas release during firing | Request LOI <0.5% in feldspar COA |
| Blue-grey tint in premium white glaze | TiO₂ above 0.03% in feldspar | Specify TiO₂ <0.02% in COA; verify by XRF |
| Sample quality good; bulk shipment inconsistent | Sample ≠ bulk lot — no per-shipment COA | Demand NABL COA on every shipment, not one-time sample |
Aalok Overseas Sodium Feldspar Powder — Available Grades
Standard Sodium Feldspar 200 Mesh
Reliable, cost-effective flux for domestic and standard-export wall tile bodies and general-purpose glazes. Consistent Na₂O content and low LOI ensure predictable, repeatable firing behaviour batch after batch.
Na₂O 9.0-10.0% · Fe₂O₃ <0.20% · LOI <0.6% · 200 Mesh · NABL COA
Premium Sodium Feldspar 325 Mesh
Finer grading and tighter chemistry control for vitrified tile bodies, export-grade glazes, and frit manufacturing where uniform melt and consistent whiteness are critical to passing quality inspection.
Na₂O 9.5-10.5% · Fe₂O₃ <0.15% · LOI <0.5% · 325 Mesh · NABL COA
High-Flow Sodium Feldspar — Fast-Fire & Frit Grade
Highest Na₂O and lowest iron in the range, engineered for fast-fire glaze cycles, enamel frit, and glass manufacturing where melt speed, clarity, and colour purity are the priority.
Na₂O 10.0-11.0% · Fe₂O₃ <0.10% · LOI <0.4% · 325 Mesh · NABL COA
Why Mine-Direct Supply Makes the Difference
Aalok Overseas has operated its own dedicated mine sources in Rajasthan since 1992. Unlike traders who blend material from multiple mine zones and multiple suppliers, Aalok Overseas controls every step — from mine extraction and beneficiation to milling, mesh grading, and NABL-certified XRF analysis. This is why Na₂O content, iron level, and mesh grading stay within a tight band lot after lot, not occasionally. Consistency is the quality guarantee behind every shipment.
Aalok Overseas — Sodium Feldspar Powder Specification Reference
| GRADE | NA₂O | FE₂O₃ | TIO₂ | SIO₂ | AL₂O₃ | LOI | MESH | APPLICATION |
|---|---|---|---|---|---|---|---|---|
| Standard 200M | 9.0-10.0% | <0.20% | <0.03% | 65-68% | 17-19% | <0.6% | ≥200M | Wall Tile · Domestic |
| Premium 325M | 9.5-10.5% | <0.15% | <0.025% | 65-68% | 18-20% | <0.5% | ≥325M | Vitrified Tile · Export |
| High-Flow Fast-Fire | 10.0-11.0% | <0.10% | <0.02% | 66-69% | 18-20% | <0.4% | ≥325M | Frit · Fast-Fire Glaze |
| Glass Grade | 9.5-11.0% | <0.10% | <0.02% | 66-69% | 18-20% | <0.4% | ≥325M | Container & Sheet Glass |
All grades: NABL XRF COA · MSDS · Certificate of Origin · Free sample — 48hr dispatch · FOB Mundra / Kandla · Export to 50+ countries
FAQ — Best Quality Sodium Feldspar Powder
Q
What makes sodium feldspar powder "best quality"?
Best-quality sodium feldspar powder has Na₂O 9-11% for reliable flux performance, Fe₂O₃ below 0.10-0.12% for whiteness and colour consistency, consistent 200/325 mesh grading for predictable melt behaviour, low LOI below 0.4-0.6%, and a NABL-accredited XRF COA verifying every shipment.
Q
What is the difference between sodium feldspar and potassium feldspar?
Sodium feldspar (albite, NaAlSi₃O₈) has a lower melt viscosity than potassium feldspar (orthoclase, KAlSi₃O₈), producing faster, more fluid, bubble-free melts at lower temperatures — making it preferred for fast-fire glazes, frit, and glass. Potassium feldspar has a higher, more controlled viscosity, often preferred for porcelain and sanitaryware bodies requiring precise vitrification control.
Q
What Na₂O percentage should I look for in sodium feldspar?
For standard wall tile and general glaze applications, Na₂O 9.0-10.0% is adequate. For fast-fire glaze, frit, and glass manufacturing where melt speed and flow are critical, Na₂O 10.0-11.0% is preferred. Aalok Overseas offers both ranges depending on grade.
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, SiO₂, Al₂O₃, and LOI. Fire a trial batch in your actual kiln and compare melt flow, whiteness, and shrinkage against your reference standard. Aalok Overseas dispatches free samples with full NABL COA within 48 hours of request.
Q
Which mesh size is best for sodium feldspar in ceramic glaze?
200 mesh is standard for general-purpose glaze and wall tile bodies. 325 mesh finer grading is preferred for vitrified tile, frit, and fast-fire glaze applications where uniform, complete melt within a shorter firing cycle is essential.
Q
Where does Aalok Overseas source its sodium feldspar from?
Aalok Overseas sources sodium feldspar from dedicated mine deposits in Rajasthan, India, applying beneficiation, milling, and mesh grading in-house before NABL-accredited XRF verification on every shipment. Mine-direct control is what allows consistent Na₂O, iron, and mesh specification lot after lot.
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REQUEST SODIUM FELDSPAR SAMPLE · NABL COA · NA₂O & FE₂O₃ REFERENCE DATA
Contact Aalok Overseas — India's Best Quality Sodium Feldspar Powder Supplier
Request free samples of Standard Sodium Feldspar (200 mesh), Premium Sodium Feldspar (325 mesh, Fe₂O₃ <0.15%), or High-Flow Fast-Fire Grade (Fe₂O₃ <0.10%) — with NABL-certified COA, melt-flow reference data, and MSDS. Consistent flux performance from the first firing.
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