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What Is High Whiteness Potash Feldspar — and Who Supplies It?
The 5 markers of genuinely high whiteness potash feldspar:
- Verify Fe₂O₃ below 0.04-0.06% — the single largest factor separating "white" claims from actually white-firing material.
- Check TiO₂ below 0.01-0.015% — titanium causes a grey-blue tint that iron testing alone will not catch.
- Demand ISO brightness above 88-92% in the COA — the verifiable optical number, not a marketing description.
- Confirm K₂O 11.5-13% is maintained — whiteness selection should not come at the cost of vitrification control.
- 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 Potash 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 88-92% · K₂O Vitrification Retained · NABL COA · Porcelain, Bone China & Sanitaryware 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 POTASSIUM FELDSPAR SPECSWhat Is High Whiteness Potash Feldspar — and Why Does It Matter?
High whiteness Potash Feldspar is potassium feldspar (orthoclase, KAlSi₃O₈) selected and beneficiated specifically to minimise iron and titanium impurities, so that its naturally wide, controlled melt viscosity — the property that lets porcelain, bone china, and sanitaryware hold shape through a broad firing range — can be used in applications where colour purity is non-negotiable. Ordinary potassium feldspar is graded primarily on K₂O 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 in a bone china or premium sanitaryware body that a high whiteness grade will not.
High Whiteness Requirements by Application
| APPLICATION | FE₂O₃ CEILING | ISO BRIGHTNESS REQUIRED | MARKET / STANDARD |
|---|---|---|---|
| Bone China / Fine Porcelain | <0.03% | 90-93% | EU, UK, Japan export |
| Premium Sanitaryware | <0.04% | 89-92% | ISO, EN, JIS B 1082 |
| Porcelain Floor Tile — Export Grade | <0.05% | 88-91% | ISO 13006, EN ISO 10545 |
| Enamel Frit / Premium Glaze | <0.05% | 89-92% | Manufacturer specification |
| Clear Container & Sheet Glass | <0.03% | 91%+ | ASTM C162, IS 2835 |
| Polished Vitrified Tile (GVT) | <0.06% | 87-90% | ISO 13006 Group BIa |
8 Markers of Genuinely High Whiteness Potash Feldspar — What to Verify Before You Buy
MARKER 01 — MOST IMPORTANT
Fe₂O₃ Below 0.04-0.06% — The Whiteness Ceiling
Iron oxide is the dominant impurity responsible for cream, buff, or yellow tinting in fired porcelain, sanitaryware, and bone china. Standard-grade potassium feldspar commonly runs Fe₂O₃ 0.10-0.20%, which is acceptable for wall tile but visibly limits brightness on premium white ware. Genuinely high whiteness potash feldspar holds Fe₂O₃ below 0.04-0.06%, and Aalok Overseas' ultra-white grade below 0.03%.
MARKER 02 — OFTEN OVERLOOKED
TiO₂ Below 0.01-0.015% — 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 fires dull or grey in bone china and premium sanitaryware because titanium was never controlled. High whiteness potash feldspar specifies TiO₂ below 0.01-0.015% as a separate, verified line item on the COA.
MARKER 03 — VERIFIABLE METRIC
ISO Brightness Above 88-92%
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 body looks, rather than a chemistry figure alone. Genuinely high whiteness potash feldspar reports ISO brightness of 88% or higher, with bone china grades reaching 90-93%.
MARKER 04 — VITRIFICATION CONTROL RETAINED
K₂O Maintained at 11.5-13%
Whiteness selection should not come at the cost of the wide, controlled melting range that makes potassium feldspar valuable in the first place. Some low-iron feldspars achieve their whiteness by blending in inert, low-flux material, which quietly reduces K₂O and narrows the safe firing window. High whiteness potash feldspar keeps K₂O in the same 11.5-13% range as standard premium grades.
MARKER 05 — CONSISTENCY
Consistent 200/325 Mesh Grading
Particle size affects both melt uniformity and how light scatters off a fired body 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 0.35% for Stable, Predictable Melt
High LOI introduces gas release during firing that can affect body surface quality, sometimes appearing as micro-pinholing or slight discolouration that dulls apparent brightness even when the underlying chemistry is correct. High whiteness potash feldspar pairs low iron and titanium with LOI below 0.35%.
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 potash feldspar comes with a NABL-accredited COA reporting Fe₂O₃, TiO₂, K₂O, 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 Potash Feldspar Sourcing Problem — Symptom → Cause → Fix
| SYMPTOM OBSERVED | PROBABLE CAUSE | RECOMMENDED FIX |
|---|---|---|
| Porcelain/bone china fires cream or yellow-tinted despite "white" claim | Fe₂O₃ above 0.06% — no ISO brightness verification | Demand Fe₂O₃ <0.04% and ISO brightness figure in COA |
| Grey or dull cast in white ware, iron reading acceptable | TiO₂ not tested or above 0.015% | Specify TiO₂ <0.01% as a separate line item in COA |
| Firing range narrower than expected from a "premium" grade | Whiteness achieved by diluting K₂O with inert filler | Verify K₂O 11.5-13% 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 or slight discolouration in fired body | High LOI causing gas release during firing | Request LOI <0.35% 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 Potash Feldspar — Available Grades
High Whiteness Potash Feldspar — 200 Mesh
Selectively beneficiated for export-grade porcelain floor tile and premium wall tile glaze work, offering a clear step up in brightness over standard-grade potassium feldspar without narrowing the firing range.
K₂O 11.5-12.5% · Fe₂O₃ <0.06% · TiO₂ <0.015% · ISO Brightness 87-89% · 200 Mesh · NABL COA
High Whiteness Potash Feldspar — 325 Mesh
Finer grading combined with tighter iron and titanium control, engineered for premium sanitaryware, export porcelain, and enamel frit where visible whiteness is a quality-inspection criterion.
K₂O 12.0-13.0% · Fe₂O₃ <0.04% · TiO₂ <0.01% · ISO Brightness 89-92% · 325 Mesh · NABL COA
Ultra White Potash Feldspar — Bone China & Glass Grade
Our lowest iron and titanium formulation, purpose-built for bone china, fine porcelain, and clear container/sheet glass where colour purity is the single most important specification.
K₂O 12.5-13.0% · Fe₂O₃ <0.03% · TiO₂ <0.008% · ISO Brightness 91-93% · 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 K₂O, 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 Potash Feldspar Specification Reference
| GRADE | K₂O | FE₂O₃ | TIO₂ | SIO₂ | LOI | ISO BRIGHTNESS | MESH | APPLICATION |
|---|---|---|---|---|---|---|---|---|
| High Whiteness 200M | 11.5-12.5% | <0.06% | <0.015% | 65-68% | <0.4% | 87-89% | ≥200M | Export Porcelain Tile · Premium Glaze |
| High Whiteness 325M | 12.0-13.0% | <0.04% | <0.01% | 65-68% | <0.35% | 89-92% | ≥325M | Sanitaryware · Porcelain · Frit |
| Ultra White Bone China/Glass | 12.5-13.0% | <0.03% | <0.008% | 65-68% | <0.3% | 91-93% | ≥325M | Bone China · Fine Porcelain · Clear Glass |
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 Potash Feldspar
Q
What makes potash feldspar "high whiteness"?
High whiteness potash feldspar is potassium feldspar selectively beneficiated to hold Fe₂O₃ below 0.04-0.06% and TiO₂ below 0.01-0.015%, verified by ISO brightness above 88-92%, while maintaining K₂O 11.5-13% so vitrification control 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 in bone china or premium sanitaryware because titanium was never checked. Both must be verified independently.
Q
Does choosing a high whiteness grade narrow the firing range?
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 K₂O and narrows the safe vitrification window. Genuine high whiteness potash feldspar maintains K₂O 11.5-13%, the same range as standard premium grades.
Q
What ISO brightness value should I ask for?
For export porcelain tile and premium glaze, ISO brightness 87-89% is typical. For sanitaryware and general porcelain, 89-92% is preferred. For bone china, fine porcelain, and clear glass, 91% or higher is recommended.
Q
How is high whiteness potash feldspar different from standard potassium feldspar?
Both share the same K₂O flux range and wide, controlled 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 K₂O 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, K₂O, LOI, and a numeric ISO brightness value — not just a written description. Fire a trial batch in your actual kiln 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 Potash Feldspar Specialist
Request free samples of High Whiteness Potash Feldspar 200 Mesh, 325 Mesh (Fe₂O₃ <0.04%), or Ultra White Bone China & Glass Grade (Fe₂O₃ <0.03%, ISO Brightness 91-93%) — with NABL-certified COA, brightness reference data, and MSDS. Verified whiteness, not just a claim.
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