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What Is High Whiteness Quartz Powder for Ceramics — and Who Supplies It?
The 5 markers of genuinely high whiteness quartz powder:
- Verify Fe₂O₃ below 0.01-0.02% — the single largest factor separating "white" claims from actually white-firing material.
- Check TiO₂ below 0.008-0.01% — titanium causes a grey-blue tint that iron testing alone will not catch.
- Demand ISO brightness above 90-94% in the COA — the verifiable optical number, not a marketing description.
- Confirm SiO₂ purity 99.5-99.9% is maintained — whiteness selection should not come at the cost of structural strength.
- 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 Quartz Powder to 50+ Countries Since 1992 · www.feldsparindia.com
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AALOK OVERSEAS INDIA · RAJASTHAN · QUARTZ DIVISION · PRODUCT GUIDE
Ultra Low Iron · Low Titanium · ISO Brightness 90-94% · SiO₂ Purity Retained · NABL COA · Bone China, Sanitaryware & Polished Tile 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 QUARTZ POWDER SPECSWhat Is High Whiteness Quartz Powder for Ceramics — and Why Does It Matter?
High whiteness Quartz Powder is crystalline silica (SiO₂) selected and beneficiated specifically to minimise iron and titanium impurities, so that its structural role in a ceramic body — hardness, thermal shock resistance, and dimensional stability — can be delivered without compromising the overall whiteness of a premium white ware body. A ceramic body's final colour is the combined result of its feldspar, kaolin, and quartz components; even when feldspar and kaolin are both high-grade, a standard-purity quartz filler carrying elevated iron or titanium can still visibly dull the fired result. Ordinary quartz powder is graded primarily on SiO₂ purity 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.
High Whiteness Requirements by Application
| APPLICATION | FE₂O₃ CEILING | ISO BRIGHTNESS REQUIRED | MARKET / STANDARD |
|---|---|---|---|
| Bone China / Fine Porcelain | <0.015% | 92-95% | EU, UK, Japan export |
| Premium Sanitaryware | <0.02% | 91-94% | ISO, EN, JIS B 1082 |
| Polished Vitrified Tile (GVT) | <0.03% | 90-93% | ISO 13006 Group BIa |
| Clear Container & Sheet Glass | <0.015% | 93%+ | ASTM C162, IS 2835 |
| Porcelain Floor Tile — Export Grade | <0.025% | 90-92% | ISO 13006, EN ISO 10545 |
| Premium Enamel Frit | <0.02% | 91-94% | Manufacturer specification |
8 Markers of Genuinely High Whiteness Quartz Powder — What to Verify Before You Buy
MARKER 01 — MOST IMPORTANT
Fe₂O₃ Below 0.01-0.02% — The Whiteness Ceiling
Iron oxide is the dominant impurity responsible for cream, buff, or off-white tinting in a fired body's structural filler component. Standard-grade quartz powder commonly runs Fe₂O₃ 0.03-0.05%, which is acceptable for wall tile and foundry work but visibly limits brightness in premium white ware. Genuinely high whiteness quartz powder holds Fe₂O₃ below 0.01-0.02%, and Aalok Overseas' ultra-white grade below 0.01%.
MARKER 02 — OFTEN OVERLOOKED
TiO₂ Below 0.008-0.01% — 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 dulls a bone china or premium sanitaryware body because titanium was never controlled. High whiteness quartz powder specifies TiO₂ below 0.008-0.01% as a separate, verified line item on the COA.
MARKER 03 — VERIFIABLE METRIC
ISO Brightness Above 90-94%
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 quartz powder reports ISO brightness of 90% or higher, with bone china and glass grades reaching 93-95%.
MARKER 04 — STRUCTURAL STRENGTH RETAINED
SiO₂ Purity Maintained at 99.5-99.9%
Whiteness selection should not come at the cost of the structural strength and thermal stability that quartz contributes to a ceramic body in the first place. Genuine high whiteness quartz powder achieves its brightness through selective mining of low-iron, low-titanium zones — not by diluting SiO₂ purity with an inert filler — so structural performance is fully retained alongside the whiteness gain.
MARKER 05 — CONSISTENCY
Consistent 200/325 Mesh Grading
Particle size affects both packing density 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 0.1-0.12% for Stable, Predictable Firing
High LOI introduces moisture or 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 quartz powder pairs low iron and titanium with LOI below 0.1-0.12%.
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 quartz powder comes with a NABL-accredited COA reporting Fe₂O₃, TiO₂, SiO₂, 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, and grading in-house, which is what makes repeatable high whiteness possible at scale.
High Whiteness Quartz Powder Sourcing Problem — Symptom → Cause → Fix
| SYMPTOM OBSERVED | PROBABLE CAUSE | RECOMMENDED FIX |
|---|---|---|
| Body dulls despite premium feldspar and kaolin | Standard-purity quartz filler carrying Fe₂O₃ above 0.02% | Switch to Fe₂O₃ <0.01% high whiteness quartz; verify XRF COA |
| Grey or dull cast in white ware, iron reading acceptable | TiO₂ not tested or above 0.01% | Specify TiO₂ <0.008% as a separate line item in COA |
| Body strength weaker than expected from a "premium" grade | Whiteness achieved by diluting SiO₂ with inert filler | Verify SiO₂ 99.5-99.9% 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 moisture/gas release during firing | Request LOI <0.12% in quartz 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 Quartz Powder — Available Grades
High Whiteness Quartz Powder — 200 Mesh
Selectively beneficiated for export-grade porcelain floor tile and premium wall tile work, offering a clear step up in brightness over standard-grade quartz powder without any loss of structural strength.
SiO₂ 99.3-99.6% · Fe₂O₃ <0.02% · TiO₂ <0.01% · ISO Brightness 90-92% · 200 Mesh · NABL COA
High Whiteness Quartz Powder — 325 Mesh
Finer grading combined with tighter iron and titanium control, engineered for premium sanitaryware, export porcelain, and polished vitrified tile where visible whiteness is a quality-inspection criterion.
SiO₂ 99.5-99.8% · Fe₂O₃ <0.015% · TiO₂ <0.009% · ISO Brightness 91-93% · 325 Mesh · NABL COA
Ultra White Quartz Powder — 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.
SiO₂ 99.7-99.9% · Fe₂O₃ <0.01% · TiO₂ <0.007% · ISO Brightness 93-95% · 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 SiO₂, 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 Quartz Powder Specification Reference
| GRADE | SIO₂ | FE₂O₃ | TIO₂ | AL₂O₃ | LOI | ISO BRIGHTNESS | MESH | APPLICATION |
|---|---|---|---|---|---|---|---|---|
| High Whiteness 200M | 99.3-99.6% | <0.02% | <0.01% | <0.15% | <0.12% | 90-92% | ≥200M | Export Porcelain Tile · Premium Wall Tile |
| High Whiteness 325M | 99.5-99.8% | <0.015% | <0.009% | <0.1% | <0.1% | 91-93% | ≥325M | Sanitaryware · Porcelain · Polished GVT |
| Ultra White Bone China/Glass | 99.7-99.9% | <0.01% | <0.007% | <0.08% | <0.08% | 93-95% | ≥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 Quartz Powder for Ceramics
Q
What makes quartz powder "high whiteness"?
High whiteness quartz powder is silica selectively beneficiated to hold Fe₂O₃ below 0.01-0.02% and TiO₂ below 0.008-0.01%, verified by ISO brightness above 90-94%, while maintaining SiO₂ purity of 99.5-99.9% so structural strength is not sacrificed for whiteness.
Q
Why does the quartz filler affect whiteness if I already use premium feldspar and kaolin?
A ceramic body's final colour reflects all its components combined. Even with high-grade, low-iron feldspar and kaolin, a standard-purity quartz filler carrying elevated Fe₂O₃ or TiO₂ can still measurably dull the fired result, since quartz typically makes up a significant proportion of body weight. High whiteness quartz closes this gap.
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 reduce structural strength?
It shouldn't, if the whiteness is achieved through genuine low-iron, low-titanium mineral selection. Some suppliers achieve apparent whiteness by diluting SiO₂ purity with inert filler, which reduces the hardness and thermal stability quartz is meant to contribute. Genuine high whiteness quartz powder maintains SiO₂ 99.5-99.9%.
Q
What ISO brightness value should I ask for?
For export porcelain tile and premium wall tile, ISO brightness 90-92% is typical. For sanitaryware and polished vitrified tile, 91-93% is preferred. For bone china, fine porcelain, and clear glass, 93% 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, SiO₂, LOI, and a numeric ISO brightness value — not just a written description. Fire a trial batch in your actual kiln alongside your existing feldspar and kaolin, and compare the result to your reference standard before committing to bulk order.
Search Keywords — 8 Languages
Hindi — हिंदी: उच्च श्वेतता क्वार्ट्ज पाउडर · सफेद क्वार्ट्ज पाउडर · कम आयरन क्वार्ट्ज · आलोक ओवरसीज क्वार्ट्ज · राजस्थान क्वार्ट्ज निर्यातक
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Vietnamese — Tiếng Việt: Bột thạch anh độ trắng cao · Bột thạch anh trắng Ấn Độ · Thạch anh sắt thấp · Độ sáng ISO thạch anh · Thạch anh Ấn Độ chất lượng cao
REQUEST HIGH WHITENESS SAMPLE · NABL COA · FE₂O₃, TIO₂ & ISO BRIGHTNESS REFERENCE DATA
Contact Aalok Overseas — India's High Whiteness Quartz Powder Specialist
Request free samples of High Whiteness Quartz Powder 200 Mesh, 325 Mesh (Fe₂O₃ <0.015%), or Ultra White Bone China & Glass Grade (Fe₂O₃ <0.01%, ISO Brightness 93-95%) — with NABL-certified COA, brightness reference data, and MSDS. Verified whiteness, not just a claim.
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