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What Is High Whiteness Soda Feldspar — and Who Supplies It?
The 5 markers of genuinely high whiteness soda feldspar:
- Verify Fe₂O₃ below 0.08-0.10% — the single largest factor separating "white" claims from actually white-firing material.
- Check TiO₂ below 0.02% — titanium causes a grey-blue tint that iron testing alone will not catch.
- Demand ISO brightness above 85-90% in the COA — the verifiable optical number, not a marketing description.
- Confirm Na₂O 9.5-11% is maintained — whiteness selection should not come at the cost of flux performance.
- Request consistent 200/325 mesh grading and a NABL-accredited XRF COA on every shipment, not a one-time sample.
Source: Aalok Overseas Technical Laboratory, Rajasthan, India · Manufacturer & Exporter of High Whiteness Soda Feldspar to 50+ Countries Since 1992 · www.feldsparindia.com
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AALOK OVERSEAS INDIA · RAJASTHAN · FELDSPAR DIVISION · PRODUCT GUIDE
Ultra Low Iron · Low Titanium · ISO Brightness 85-90% · Na₂O Flux Retained · NABL COA · Polished Tile & Premium Glaze Grade · 50+ Countries · Exporter Since 1992
Published: July 2026 | Author: Aalok Overseas Technical Team | Category: Ceramic Raw Material Quality
REQUEST HIGH WHITENESS SAMPLE → VIEW FULL SODIUM FELDSPAR SPECSWhat Is High Whiteness Soda Feldspar — and Why Does It Matter?
High whiteness Soda Feldspar is sodium feldspar (albite, NaAlSi₃O₈) selected and beneficiated specifically to minimise iron and titanium impurities, so that its naturally low melt viscosity — the property that makes soda feldspar valuable as a fast, uniform flux — can be used in applications where colour purity is non-negotiable: polished vitrified tile, premium sanitaryware glaze, enamel frit, and clear glass. Ordinary sodium feldspar is graded primarily on Na₂O and mesh size; high whiteness grades add a strict ceiling on Fe₂O₃ and TiO₂, verified by ISO brightness testing, on top of the standard specification. The difference shows up directly on the fired surface — a standard-grade feldspar batch can leave a visible cream or grey cast under a clear glaze that a high whiteness grade will not.
High Whiteness Requirements by Application
| APPLICATION | FE₂O₃ CEILING | ISO BRIGHTNESS REQUIRED | MARKET / STANDARD |
|---|---|---|---|
| Polished Vitrified Tile (GVT) | <0.08% | 88-92% | ISO 13006 Group BIa |
| Premium Sanitaryware Glaze | <0.08% | 87-91% | ISO, EN, JIS B 1082 |
| Enamel Frit / Fast-Fire Glaze | <0.06% | 88-92% | Manufacturer specification |
| Clear Container & Sheet Glass | <0.05% | 90%+ | ASTM C162, IS 2835 |
| Bone China / Fine Porcelain | <0.06% | 88-91% | EU, UK, Japan export |
| Vitrified Wall Tile — Export Grade | <0.10% | 85-88% | ISO 13006, SNI, TCVN |
8 Markers of Genuinely High Whiteness Soda Feldspar — What to Verify Before You Buy
MARKER 01 — MOST IMPORTANT
Fe₂O₃ Below 0.08-0.10% — The Whiteness Ceiling
Iron oxide is the dominant impurity responsible for cream, buff, or yellow tinting in fired glaze and tile. Standard-grade sodium feldspar commonly runs Fe₂O₃ 0.15-0.25%, which is acceptable for wall tile but visibly limits brightness on polished or clear-glazed surfaces. Genuinely high whiteness soda feldspar holds Fe₂O₃ below 0.08-0.10%, and Aalok Overseas' ultra-white grade below 0.06%.
MARKER 02 — OFTEN OVERLOOKED
TiO₂ Below 0.02% — The Impurity Iron Testing Misses
Titanium dioxide produces a distinct grey-blue undertone that is easy to miss if a supplier only reports Fe₂O₃. Buyers who test iron alone can still receive material that looks dull or grey under a clear glaze because titanium was never controlled. High whiteness soda feldspar specifies TiO₂ below 0.02% as a separate, verified line item on the COA.
MARKER 03 — VERIFIABLE METRIC
ISO Brightness Above 85-90%
ISO brightness is the single optical measurement that captures the combined visual effect of iron, titanium, and particle size — it is the number that actually correlates with how white the fired surface looks, rather than a chemistry figure alone. Genuinely high whiteness soda feldspar reports ISO brightness of 85% or higher, with premium grades reaching 90%+.
MARKER 04 — FLUX PERFORMANCE RETAINED
Na₂O Maintained at 9.5-11%
Whiteness selection should not come at the cost of the flux performance that makes soda feldspar valuable in the first place. Some low-iron feldspars achieve their whiteness by blending in inert, low-flux material, which quietly reduces Na₂O and melt performance. High whiteness soda feldspar keeps Na₂O in the same 9.5-11% range as standard high-flow grades.
MARKER 05 — CONSISTENCY
Consistent 200/325 Mesh Grading
Particle size affects both melt uniformity and how light scatters off a fired glaze surface, contributing to perceived whiteness. Coarse or inconsistently graded material can look duller even at the same chemistry. High whiteness grades are held to a tight 200 or 325 mesh band, consistent lot to lot.
MARKER 06 — FIRING STABILITY
Low LOI Below 0.4% for Stable, Predictable Melt
High LOI introduces gas release during firing that can affect glaze surface quality, sometimes appearing as micro-pinholing that dulls apparent gloss and whiteness even when the underlying chemistry is correct. High whiteness soda feldspar pairs low iron and titanium with LOI below 0.4%.
MARKER 07 — DOCUMENTATION
NABL-Accredited XRF COA with ISO Brightness, on Every Shipment
Many suppliers quote "high whiteness" without a verified brightness number, or verify it only on the initial sample. Genuine high whiteness soda feldspar comes with a NABL-accredited COA reporting Fe₂O₃, TiO₂, Na₂O, LOI, and ISO brightness on every shipment — not a one-time claim.
MARKER 08 — SUPPLY RELIABILITY
Mine-Direct, Selectively Beneficiated Sourcing
High whiteness grades require selective mining and beneficiation to isolate low-iron, low-titanium zones within a deposit — a process traders blending multiple sources cannot replicate consistently. Mine-direct manufacturers like Aalok Overseas control extraction zone selection, washing, and grading in-house, which is what makes repeatable high whiteness possible at scale.
High Whiteness Soda Feldspar Sourcing Problem — Symptom → Cause → Fix
| SYMPTOM OBSERVED | PROBABLE CAUSE | RECOMMENDED FIX |
|---|---|---|
| Glaze fires cream or yellow-tinted despite "white" claim | Fe₂O₃ above 0.10% — no ISO brightness verification | Demand Fe₂O₃ <0.08% and ISO brightness figure in COA |
| Grey or dull cast under clear glaze, iron reading acceptable | TiO₂ not tested or above 0.02% | Specify TiO₂ <0.02% as a separate line item in COA |
| Melt flow weaker than expected from a "premium" grade | Whiteness achieved by diluting Na₂O with inert filler | Verify Na₂O 9.5-11% is maintained alongside whiteness spec |
| Brightness varies noticeably batch to batch | No per-lot ISO brightness testing, blended mine sources | Demand NABL COA with brightness per shipment; confirm mine-direct sourcing |
| Micro-pinholing dulling glaze gloss | High LOI causing gas release during firing | Request LOI <0.4% in feldspar COA |
| Sample was excellent; bulk shipment noticeably duller | Sample ≠ bulk lot — no per-shipment verification | Demand NABL COA with ISO brightness on every shipment |
Aalok Overseas High Whiteness Soda Feldspar — Available Grades
High Whiteness Soda Feldspar — 200 Mesh
Selectively beneficiated for export-grade vitrified wall tile and standard premium glaze work, offering a clear step up in brightness over standard-grade sodium feldspar without sacrificing melt performance.
Na₂O 9.5-10.5% · Fe₂O₃ <0.10% · TiO₂ <0.025% · ISO Brightness 85-88% · 200 Mesh · NABL COA
High Whiteness Soda Feldspar — 325 Mesh
Finer grading combined with tighter iron and titanium control, engineered for polished vitrified tile, premium sanitaryware glaze, and export porcelain where visible whiteness is a quality-inspection criterion.
Na₂O 10.0-11.0% · Fe₂O₃ <0.08% · TiO₂ <0.02% · ISO Brightness 87-90% · 325 Mesh · NABL COA
Ultra White Soda Feldspar — Frit & Glass Grade
Our lowest iron and titanium formulation, purpose-built for enamel frit, clear container and sheet glass, and bone china where colour purity is the single most important specification.
Na₂O 10.0-11.0% · Fe₂O₃ <0.05% · TiO₂ <0.015% · ISO Brightness 90%+ · 325 Mesh · NABL COA
Why Mine-Direct, Selective Sourcing Makes the Difference
Aalok Overseas has operated its own dedicated mine sources in Rajasthan since 1992. High whiteness grades are not achieved by blending — they come from identifying and selectively extracting the lowest iron, lowest titanium zones within our own deposits, then washing, milling, and mesh-grading that material separately from standard-grade output. This is why our high whiteness Na₂O, Fe₂O₃, TiO₂, and ISO brightness figures stay within a tight band lot after lot, not occasionally. Consistency is the whiteness guarantee behind every shipment.
Aalok Overseas — High Whiteness Soda Feldspar Specification Reference
| GRADE | NA₂O | FE₂O₃ | TIO₂ | SIO₂ | LOI | ISO BRIGHTNESS | MESH | APPLICATION |
|---|---|---|---|---|---|---|---|---|
| High Whiteness 200M | 9.5-10.5% | <0.10% | <0.025% | 65-68% | <0.45% | 85-88% | ≥200M | Export Wall Tile · Glaze |
| High Whiteness 325M | 10.0-11.0% | <0.08% | <0.02% | 66-69% | <0.4% | 87-90% | ≥325M | Polished GVT · Sanitaryware · Porcelain |
| Ultra White Frit/Glass | 10.0-11.0% | <0.05% | <0.015% | 66-69% | <0.35% | 90%+ | ≥325M | Frit · Clear Glass · Bone China |
All grades: NABL XRF COA with ISO brightness · MSDS · Certificate of Origin · Free sample — 48hr dispatch · FOB Mundra / Kandla · Export to 50+ countries
FAQ — High Whiteness Soda Feldspar
Q
What makes soda feldspar "high whiteness"?
High whiteness soda feldspar is sodium feldspar selectively beneficiated to hold Fe₂O₃ below 0.08-0.10% and TiO₂ below 0.02%, verified by ISO brightness above 85-90%, while maintaining Na₂O 9.5-11% so flux performance is not sacrificed for whiteness.
Q
Why does titanium dioxide matter if iron is already low?
Iron oxide produces a yellow-cream tint, while titanium dioxide produces a distinct grey-blue undertone. A supplier who tests and reports only Fe₂O₃ can still supply material with a visibly dull, grey-tinted result under a clear glaze because titanium was never checked. Both must be verified independently.
Q
Does choosing a high whiteness grade reduce flux performance?
It shouldn't, if the whiteness is achieved through genuine low-iron, low-titanium mineral selection. Some suppliers achieve apparent whiteness by blending in inert filler material, which quietly reduces Na₂O and melt performance. Genuine high whiteness soda feldspar maintains Na₂O 9.5-11%, the same range as standard high-flow grades.
Q
What ISO brightness value should I ask for?
For export vitrified wall tile and standard premium glaze, ISO brightness 85-88% is typical. For polished vitrified tile, sanitaryware, and porcelain, 87-90% is preferred. For enamel frit, clear glass, and bone china, 90% or higher is recommended.
Q
How is high whiteness soda feldspar different from standard sodium feldspar?
Both share the same Na₂O flux range and low-viscosity melt behaviour. The difference is in impurity selection: high whiteness grades are mined and beneficiated specifically from low-iron, low-titanium zones and verified by ISO brightness testing, while standard grades are graded mainly on Na₂O content and mesh size without a brightness ceiling.
Q
How do I verify a supplier's high whiteness claim before ordering in bulk?
Request a free sample with a NABL-accredited XRF COA that reports Fe₂O₃, TiO₂, Na₂O, LOI, and a numeric ISO brightness value — not just a written description. Fire a trial batch under your actual glaze and compare the result to your reference standard before committing to bulk order.
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REQUEST HIGH WHITENESS SAMPLE · NABL COA · FE₂O₃, TIO₂ & ISO BRIGHTNESS REFERENCE DATA
Contact Aalok Overseas — India's High Whiteness Soda Feldspar Specialist
Request free samples of High Whiteness Soda Feldspar 200 Mesh, 325 Mesh (Fe₂O₃ <0.08%), or Ultra White Frit & Glass Grade (Fe₂O₃ <0.05%, ISO Brightness 90%+) — with NABL-certified COA, brightness reference data, and MSDS. Verified whiteness, not just a claim.
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