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Posted by Admin on July, 12, 2026
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What Is High Whiteness Kaolin — and Who Supplies It?
The 5 markers of genuinely high whiteness kaolin:
- Verify Fe₂O₃ below 0.2-0.3% — the single largest factor separating "white" claims from actually white-firing material.
- Check TiO₂ below 0.3-0.5% — titanium causes a grey undertone that iron testing alone will not catch, and kaolin deposits often carry more of it than feldspar or quartz.
- Demand ISO brightness above 88-92% in the COA — the verifiable optical number, not a marketing description.
- Confirm Al₂O₃ 34-38% is maintained — whiteness selection should not come at the cost of plasticity and refractoriness.
- Request fine, consistent particle size (mesh or micron) 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 Kaolin to 50+ Countries Since 1992 · www.feldsparindia.com
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AALOK OVERSEAS INDIA · RAJASTHAN · KAOLIN DIVISION · PRODUCT GUIDE
Ultra Low Iron · Low Titanium · ISO Brightness 88-92% · Al₂O₃ Plasticity Retained · NABL COA · Bone China, Sanitaryware, Paper & Paint Grade · 50+ Countries · Exporter Since 1992
Published: July 2026 | Author: Aalok Overseas Technical Team | Category: Ceramic & Industrial Raw Materials
REQUEST HIGH WHITENESS SAMPLE → VIEW FULL KAOLIN SPECSWhat Is High Whiteness Kaolin — and Why Does It Matter?
High whiteness Kaolin is hydrated aluminium silicate clay selected and beneficiated specifically to minimise iron and titanium impurities, so that the whiteness it is fundamentally chosen for — more than any other raw material in a ceramic body or coating formulation — is delivered to the highest verifiable standard. Feldspar and quartz contribute some whiteness sensitivity, but kaolin is the ingredient buyers reach for specifically because of its brightness contribution, which means impurity control matters more here than anywhere else in the formulation. Ordinary kaolin is graded primarily on Al₂O₃ and particle size; high whiteness grades add a strict ceiling on Fe₂O₃ and TiO₂, verified by ISO brightness testing, on top of the standard specification.
High Whiteness Requirements by Application
| APPLICATION | FE₂O₃ CEILING | ISO BRIGHTNESS REQUIRED | MARKET / STANDARD |
|---|---|---|---|
| Paper Coating Grade | <0.15% | 90-92% | TAPPI, ISO brightness standards |
| Bone China / Fine Porcelain | <0.2% | 89-92% | EU, UK, Japan export |
| Premium Paint & Cosmetics Grade | <0.2% | 89-91% | Manufacturer specification |
| Premium Sanitaryware | <0.3% | 87-90% | ISO, EN, JIS B 1082 |
| Porcelain Floor Tile — Export Grade | <0.35% | 85-88% | ISO 13006, EN ISO 10545 |
| Rubber & Plastics Filler — Bright Grade | <0.4% | 84-87% | Manufacturer specification |
8 Markers of Genuinely High Whiteness Kaolin — What to Verify Before You Buy
MARKER 01 — MOST IMPORTANT
Fe₂O₃ Below 0.2-0.3% — The Whiteness Ceiling
Iron oxide is the dominant impurity responsible for cream, buff, or yellow tinting in kaolin — and because kaolin is chosen specifically for whiteness, its iron ceiling is held tighter than in feldspar or quartz relative to their respective roles. Standard-grade kaolin commonly runs Fe₂O₃ 0.6-1.2%, which is acceptable for domestic wall tile but visibly limits brightness in premium white ware and coatings. Genuinely high whiteness kaolin holds Fe₂O₃ below 0.2-0.3%, and Aalok Overseas' paper-grade formulation below 0.15%.
MARKER 02 — OFTEN OVERLOOKED
TiO₂ Below 0.3-0.5% — The Impurity Iron Testing Misses
Titanium dioxide produces a distinct grey undertone that is easy to miss if a supplier only reports Fe₂O₃ — and kaolin deposits are naturally more prone to carrying accessory titanium minerals than feldspar or quartz deposits. Buyers who test iron alone can still receive material that fires or coats dull because titanium was never controlled. High whiteness kaolin specifies TiO₂ below 0.3-0.5% 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 a fired body or coated surface looks, rather than a chemistry figure alone. Genuinely high whiteness kaolin reports ISO brightness of 88% or higher, with paper-coating grades reaching 90-92%.
MARKER 04 — PLASTICITY RETAINED
Al₂O₃ Maintained at 34-38%
Whiteness selection should not come at the cost of the alumina content that gives kaolin its plasticity and green strength in the raw state, and its contribution to mullite formation on firing. Genuine high whiteness kaolin achieves its brightness through selective mining of low-iron, low-titanium zones — not by diluting Al₂O₃ with an inert filler — so workability is fully retained alongside the whiteness gain.
MARKER 05 — CONSISTENCY
Fine, Consistent Particle Size (Mesh / Micron)
Particle fineness affects both plasticity in the green state and coating smoothness in paper or paint applications, and also contributes to perceived whiteness through how light scatters off finer particles. Coarse or inconsistently graded kaolin can look duller and behave less predictably even at the same chemistry. High whiteness grades are held to a controlled micron distribution, typically 85-92% below 2 micron for paper/paint grades, consistent lot to lot.
MARKER 06 — FIRING BEHAVIOUR
Controlled LOI 12.5-14% — Normal for Kaolin, But Must Stay Consistent
Kaolin naturally carries a high LOI (12-14%) from the bound water in its kaolinite crystal structure — this is expected and not an impurity signal on its own. What matters for high whiteness grades is that LOI stays consistent lot to lot within this normal band; an LOI reading well outside 12-14% can indicate contamination or an unexpected mineral mix that would also affect brightness.
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 kaolin comes with a NABL-accredited COA reporting Fe₂O₃, TiO₂, Al₂O₃, 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, washing, 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, drying, and grading in-house, which is what makes repeatable high whiteness possible at scale.
High Whiteness Kaolin Sourcing Problem — Symptom → Cause → Fix
| SYMPTOM OBSERVED | PROBABLE CAUSE | RECOMMENDED FIX |
|---|---|---|
| Body or coating fires/dries cream or buff-tinted despite "white" claim | Fe₂O₃ above 0.3% — no ISO brightness verification | Demand Fe₂O₃ <0.2% and ISO brightness figure in COA |
| Grey undertone in white ware or coating, iron reading acceptable | TiO₂ not tested or above 0.5% | Specify TiO₂ <0.3% as a separate line item in COA |
| Plasticity or green strength weaker than expected | Whiteness achieved by diluting Al₂O₃ with inert filler | Verify Al₂O₃ 34-38% 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 |
| Rough or uneven coated surface (paper/paint) | Inconsistent particle size distribution | Request micron distribution data; specify 85%+ below 2 micron |
| 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 Kaolin — Available Grades
High Whiteness Kaolin — Ceramic Grade
Selectively beneficiated for export-grade porcelain floor tile and premium sanitaryware, offering a clear step up in brightness over standard-grade kaolin without any loss of plasticity.
Al₂O₃ 33.0-35.0% · Fe₂O₃ <0.35% · TiO₂ <0.5% · ISO Brightness 85-88% · LOI 12.5-13.5% · NABL COA
High Whiteness Kaolin — Sanitaryware & Bone China Grade
Tighter iron and titanium control combined with higher Al₂O₃, engineered for premium sanitaryware, bone china, and export porcelain where visible whiteness is a quality-inspection criterion.
Al₂O₃ 35.0-37.0% · Fe₂O₃ <0.2% · TiO₂ <0.3% · ISO Brightness 88-91% · LOI 13-14% · NABL COA
Ultra White Kaolin — Paper, Paint & Cosmetics Grade
Our finest particle size and lowest iron/titanium formulation, purpose-built for paper coating, premium paint, and cosmetics where surface smoothness, gloss, and colour purity are the priority.
Al₂O₃ 36.0-38.0% · Fe₂O₃ <0.15% · TiO₂ <0.2% · ISO Brightness 90-92% · LOI 13-14% · 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, drying, and particle-size grading that material separately from standard-grade output. This is why our high whiteness Al₂O₃, 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 Kaolin Specification Reference
| GRADE | AL₂O₃ | FE₂O₃ | TIO₂ | SIO₂ | LOI | ISO BRIGHTNESS | APPLICATION |
|---|---|---|---|---|---|---|---|
| High Whiteness Ceramic Grade | 33.0-35.0% | <0.35% | <0.5% | 45-48% | 12.5-13.5% | 85-88% | Export Porcelain Tile · Sanitaryware |
| Sanitaryware / Bone China Grade | 35.0-37.0% | <0.2% | <0.3% | 45-47% | 13-14% | 88-91% | Bone China · Premium Sanitaryware |
| Ultra White Paper/Paint Grade | 36.0-38.0% | <0.15% | <0.2% | 44-47% | 13-14% | 90-92% | Paper Coating · Paint · Cosmetics |
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 Kaolin
Q
What makes kaolin "high whiteness"?
High whiteness kaolin is china clay selectively beneficiated to hold Fe₂O₃ below 0.2-0.3% and TiO₂ below 0.3-0.5%, verified by ISO brightness above 88-92%, while maintaining Al₂O₃ 34-38% so plasticity and refractoriness are not sacrificed for whiteness.
Q
Why does kaolin's whiteness matter more than feldspar's or quartz's?
Kaolin is the ingredient specifically chosen for the whiteness it contributes to a ceramic body or coating — unlike feldspar (chosen for flux behaviour) or quartz (chosen for structural strength), whiteness is kaolin's primary reason for inclusion. This means impurity control in kaolin has an outsized effect on the final result compared to the same impurity level in feldspar or quartz.
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 undertone. Kaolin deposits are naturally more prone to carrying accessory titanium minerals than feldspar or quartz. A supplier who tests and reports only Fe₂O₃ can still supply material that fires or coats dull because titanium was never checked.
Q
Does choosing a high whiteness grade reduce plasticity?
It shouldn't, if the whiteness is achieved through genuine low-iron, low-titanium mineral selection. Some suppliers achieve apparent whiteness by diluting Al₂O₃ with inert filler, which reduces the plasticity and green strength kaolin is meant to contribute. Genuine high whiteness kaolin maintains Al₂O₃ 34-38%.
Q
What ISO brightness value should I ask for?
For export porcelain tile and premium sanitaryware, ISO brightness 85-88% is typical. For bone china and premium paint, 88-91% is preferred. For paper coating and cosmetics grade, 90% or higher is recommended.
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, Al₂O₃, LOI, and a numeric ISO brightness value — not just a written description. Test plasticity and fired or coated whiteness in your own process and compare against your reference standard before committing to bulk order.
Search Keywords — 8 Languages
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Vietnamese — Tiếng Việt: Cao lanh độ trắng cao · Đất sét cao lanh trắng Ấn Độ · Cao lanh sắt thấp · Độ sáng ISO cao lanh · Cao lanh Ấn Độ chất lượng cao
REQUEST HIGH WHITENESS SAMPLE · NABL COA · FE₂O₃, TIO₂ & ISO BRIGHTNESS REFERENCE DATA
Contact Aalok Overseas — India's High Whiteness Kaolin Specialist
Request free samples of High Whiteness Kaolin Ceramic Grade, Sanitaryware & Bone China Grade (Fe₂O₃ <0.2%), or Ultra White Paper, Paint & Cosmetics Grade (Fe₂O₃ <0.15%, ISO Brightness 90-92%) — with NABL-certified COA, brightness reference data, and MSDS. Verified whiteness, not just a claim.
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