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Posted by Admin on July, 26, 2026
What Is the Best Feldspar for Sanitaryware?
The 5 specification priorities for sanitaryware feldspar:
- K₂O 12-13% for premium sanitaryware — potassium feldspar's wide vitrification range is generally preferred over soda feldspar for large, complex-shaped castings.
- Fe₂O₃ below 0.04-0.06% — sanitaryware is inspected closely for whiteness; standard-grade iron levels are usually inadequate.
- TiO₂ verified alongside Fe₂O₃ — titanium's grey-blue tint is equally visible on sanitaryware's large, smooth surfaces.
- 325 mesh grading — for uniform melt across large, thick-walled castings that need even vitrification throughout.
- Consistent LOI — since sanitaryware's large surface area makes gas-release defects like pinholing especially visible.
Source: Aalok Overseas Technical Laboratory, Rajasthan, India · Manufacturer & Exporter of Ultra-White Feldspar to 50+ Countries Since 1992 · www.feldsparindia.com
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AALOK OVERSEAS INDIA · APPLICATION GUIDE #22
Ultra-Low Iron · Whiteness · 325 Mesh · Vitrification Control · NABL COA · Exporter Since 1992
REQUEST SANITARYWARE GRADE SAMPLE → VIEW SPECIFICATIONSWhy Sanitaryware Demands the Whitest, Most Consistent Feldspar
Sanitaryware — basins, WC pans, cisterns, and bidets — is fired at high temperature into large, complex, thick-walled shapes that must vitrify evenly throughout without cracking, warping, or discolouring on any part of the surface. Because these pieces are viewed up close in bathrooms with strong lighting, even minor iron or titanium tinting is far more visible than on a floor tile viewed from a distance. This makes sanitaryware one of the most demanding applications for feldspar whiteness and vitrification consistency in the entire ceramic industry.
Sanitaryware Feldspar Requirements by Grade Tier
| GRADE TIER | K₂O | FE₂O₃ | APPLICATION |
|---|---|---|---|
| Standard Sanitaryware | 11.0-12.0% | <0.10% | Domestic market sanitaryware |
| Premium Sanitaryware | 12.0-13.0% | <0.06% | Export sanitaryware |
| Ultra White Sanitaryware | 12.5-13.0% | <0.04% | Premium/luxury sanitaryware brands |
What to Verify Before Buying Feldspar for Sanitaryware
PRIORITY 01
Fe₂O₃ Below 0.04-0.06%
Standard-grade feldspar's Fe₂O₃ (often 0.15-0.30%) is generally inadequate for premium sanitaryware — a dedicated ultra-white grade is needed.
PRIORITY 02
TiO₂ Verified Separately
Titanium causes a grey-blue tint distinct from iron's yellow-cream tint; sanitaryware's close-inspection use case makes verifying both essential, not just Fe₂O₃.
PRIORITY 03
Wide, Controlled Vitrification Range
Potassium feldspar's forgiving melting window suits the thick, complex shapes of sanitaryware castings better than sodium feldspar's faster, narrower melt in most premium formulations.
PRIORITY 04
325 Mesh for Uniform Vitrification
Finer mesh grading supports even melt throughout thick-walled castings, reducing the risk of localized under-vitrification.
PRIORITY 05
Low, Stable LOI
Sanitaryware's large, smooth surface area makes pinholing and micro-blistering from gas release especially visible, so LOI below 0.35% is preferred for premium grades.
The Aalok Overseas Advantage for Sanitaryware Manufacturers
Ultra White Potash Feldspar
Fe₂O₃ <0.03-0.04%, TiO₂ <0.01%, ISO brightness 91-93% — purpose-built for premium sanitaryware and bone china whiteness requirements.
NABL COA on Every Shipment
K₂O, Fe₂O₃, TiO₂, LOI, and mesh grading verified per lot — critical given sanitaryware's close-inspection quality standard.
Mine-Direct, Selectively Beneficiated Sourcing
Ultra-white grades come from selectively extracted, low-iron, low-titanium zones within Aalok Overseas' own Rajasthan deposits, not blended trader stock.
Full Complementary Range
Quartz powder and kaolin also available for sanitaryware's full body formulation, sourced from the same mine-direct Rajasthan operations.
Why Manufacturers Choose Aalok Overseas
Since 1992, Aalok Overseas has supplied mine-direct, NABL-certified ultra-white feldspar to sanitaryware manufacturers across 50+ countries. Sanitaryware's up-close, bright-light inspection standard leaves no room for inconsistency — verified whiteness on every shipment is the guarantee behind every load.
FAQ — Feldspar for Sanitaryware
Q
What Fe2O3 level is needed for premium sanitaryware feldspar?
Premium sanitaryware typically requires Fe₂O₃ below 0.04-0.06%, well below standard tile-grade feldspar, to achieve the bright white finish expected in close-inspection bathroom fixtures.
Q
Is potassium or sodium feldspar better for sanitaryware?
Potassium feldspar's wider, more controlled vitrification range is generally preferred for sanitaryware's thick-walled, complex-shaped castings, which benefit from a more forgiving firing window than sodium feldspar's faster melt provides.
Q
Why is titanium dioxide checked separately from iron for sanitaryware?
Titanium causes a distinct grey-blue tint separate from iron's yellow-cream tint. A supplier who only reports Fe₂O₃ can still supply material that looks dull on close inspection because titanium was never controlled.
Q
What mesh size is best for sanitaryware feldspar?
325 mesh is generally preferred to support even, complete vitrification throughout the thick walls typical of sanitaryware castings.
Q
How do I verify sanitaryware-grade feldspar before bulk ordering?
Request a NABL-accredited XRF COA showing K₂O, Fe₂O₃, TiO₂, LOI, and mesh grading, and cast/fire a trial batch to inspect whiteness under bright lighting before committing to bulk production.
Related Guides
REQUEST SANITARYWARE GRADE SAMPLE · NABL COA · FE₂O₃ & TIO₂ VERIFIED
Contact Aalok Overseas — India's Ultra-White Sanitaryware Feldspar Specialist
Request free samples of premium or ultra-white sanitaryware-grade potassium feldspar with NABL-certified COA and MSDS. Mine-direct sourced from Rajasthan since 1992, exported to 50+ countries.
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