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Posted by Admin on July, 26, 2026
What Is the Best Feldspar for Bone China?
The 5 specification priorities for bone china feldspar:
- K₂O 12.5-13%, tightly consistent — bone china's thin-walled, translucent body needs precise, repeatable vitrification.
- Fe₂O₃ below 0.03% — the tightest iron ceiling of any ceramic application, since bone china's whiteness is central to its market positioning.
- TiO₂ below 0.008% — verified as a separate line item, since titanium's grey-blue tint is just as visible as iron's on translucent, thin-walled ware.
- ISO brightness above 91-93% — the verifiable optical standard bone china buyers actually specify against.
- Fine, consistent mesh grading — supporting the smooth, even translucency that defines premium bone china.
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 #25
Ultra-White · Fe₂O₃ <0.03% · ISO Brightness 91-93% · Premium Grade · NABL COA · Exporter Since 1992
REQUEST ULTRA WHITE SAMPLE → VIEW SPECIFICATIONSWhy Bone China Sets the Highest Whiteness Bar in Ceramics
Bone china is a translucent, thin-walled porcelain body containing bone ash (typically 25-50%) alongside kaolin, feldspar, and quartz, fired to produce the whitest, most translucent ceramic ware commercially made. Because bone china's entire market identity is built on whiteness and light translucency, even the smallest iron or titanium tint — invisible in a standard ceramic tile — becomes immediately visible when light passes through a thin bone china cup or plate held up to a window. This makes bone china the single most demanding application for feldspar whiteness in the entire ceramic industry.
Bone China vs. Standard Porcelain Feldspar Requirements
| CERAMIC TYPE | K₂O | FE₂O₃ | ISO BRIGHTNESS |
|---|---|---|---|
| Standard Porcelain | 11.5-12.5% | <0.06% | 87-90% |
| Premium Sanitaryware | 12.0-13.0% | <0.04% | 88-91% |
| Bone China | 12.5-13.0% | <0.03% | 91-93% |
What to Verify Before Buying Feldspar for Bone China
PRIORITY 01
Fe₂O₃ Below 0.03%
The tightest iron ceiling of any ceramic application — standard-grade and even most premium-grade feldspar is inadequate; a purpose-built ultra-white grade is required.
PRIORITY 02
TiO₂ Below 0.008%
Verified as a separate line item, since titanium's grey undertone is just as visible as iron's yellow tint on thin, translucent bone china ware.
PRIORITY 03
ISO Brightness Above 91-93%
The verifiable optical number bone china buyers order against — a chemistry reading alone doesn't fully capture perceived whiteness the way ISO brightness does.
PRIORITY 04
Consistent K₂O for Precise Vitrification
Bone china's thin-walled body has less material to buffer chemistry variation than a thicker porcelain piece, making flux consistency especially important.
PRIORITY 05
Fine, Consistent Mesh Grading
Supports the smooth, even microstructure that gives premium bone china its characteristic even translucency, free of visible texture variation.
The Aalok Overseas Advantage for Bone China Manufacturers
Ultra White Potash Feldspar
Fe₂O₃ <0.03%, TiO₂ <0.008%, ISO brightness 91-93% — purpose-built to bone china's tightest-in-industry whiteness specification.
Matching Ultra White Quartz & Kaolin
Complementary ultra-white grades of quartz powder and kaolin available from the same Rajasthan operations, since bone china's whiteness depends on every raw material in the body.
NABL COA on Every Shipment
Full chemistry and ISO brightness verified per lot — bone china's inspection standard leaves no room for undetected batch drift.
Mine-Direct, Selectively Beneficiated Sourcing
Ultra-white grades come from selectively extracted, lowest-iron zones within Aalok Overseas' own deposits — not blended trader stock.
Why Manufacturers Choose Aalok Overseas
Since 1992, Aalok Overseas has supplied mine-direct, NABL-certified ultra-white feldspar to fine porcelain and bone china manufacturers across 50+ countries. Bone china's translucency hides nothing — verified whiteness, not a marketing claim, is what a fine china maker actually needs.
FAQ — Feldspar for Bone China
Q
What Fe2O3 level is required for bone china feldspar?
Bone china typically requires Fe₂O₃ below 0.03%, the tightest iron ceiling of any ceramic application, given bone china's translucent, whiteness-focused market positioning.
Q
Why does bone china show impurities more than other ceramics?
Bone china's thin walls are translucent, so light passing through the piece reveals even faint iron or titanium tinting that would be invisible in an opaque, thicker ceramic body.
Q
What ISO brightness should bone china feldspar have?
ISO brightness above 91-93% is typical for bone china feldspar, the highest tier used across ceramic applications.
Q
Does bone china need matching ultra-white quartz and kaolin too?
Yes. A ceramic body's final whiteness reflects all its raw material components combined, so bone china formulations typically require ultra-white grades of quartz and kaolin alongside ultra-white feldspar.
Q
How do I verify bone china-grade feldspar before bulk ordering?
Request a NABL-accredited XRF COA showing Fe₂O₃, TiO₂, K₂O, and a numeric ISO brightness value, and fire a trial batch to inspect translucency and whiteness under bright light against your reference standard.
Related Guides
REQUEST ULTRA WHITE BONE CHINA GRADE SAMPLE · NABL COA · ISO BRIGHTNESS VERIFIED
Contact Aalok Overseas — India's Bone China Feldspar Specialist
Request free samples of ultra-white bone china-grade potassium feldspar with NABL-certified COA including ISO brightness. Mine-direct sourced from Rajasthan since 1992, exported to 50+ countries.
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