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Feldspar Supplier & Exporter — Potassic, Sodic and Blended Grades

(K,Na)AlSi₃O₈ Alkali Feldspar · Total alkali 10.20 – 13.90%

Bulk feldspar in three chemistries off different working faces — a potassic grade at 11.80% K₂O with iron held to 0.14%, a sodic grade at 9.40% Na₂O for fast-fired porcelain tile, and a potassic–sodic blend for general body and glass batch. Supplied as lump, graded granular or micronized powder, with a batch-specific Certificate of Analysis per shipment.

Request a Feldspar Quote Packaging & Incoterms
Bulk feldspar — potassic and sodic alkali flux for glass, porcelain tile and glaze — B2B export supplier Raivaco K₂O 11.80%

Supply capability at a glance

13.90%

Total alkali — potassic grade

0.14%

Fe₂O₃ — potassic grade

9.40%

Na₂O — sodic grade

Per batch

Certificate of Analysis

Physical Properties

Formula

(K,Na)AlSi₃O₈

Mineral

Orthoclase / Albite

HS Code

2529.10

Mohs Hardness

6

Total Alkali

10.20 – 13.90%

L.O.I

0.35 – 0.85%

Synonyms: Potash Feldspar, Potassium Feldspar, K-Spar, Soda Feldspar, Sodium Feldspar, Orthoclase, Albite, Alkali Feldspar · Off-white to pale pink lump, graded granular or micronized powder.

Six-digit WCO heading — national subheadings vary by destination.

Grades & Chemical Analysis

Three feldspars, split on which alkali dominates — which is the property that decides how the melt behaves, not how much of it there is. Potash melts stiff over a wide temperature range and suits glaze and slow-fired porcelain; soda melts lower and runs thinner, which is what a fast-fired tile line wants; the blend sits between the two. Select a grade to view its typical analysis.

These are typical production analyses for the faces we ship from, not the result of a single certificate — feldspar is quarried, and the chemistry moves within a band across a working face. Oxide totals run 98.62–100.23%, which is ordinary for XRF once rounding and unreported trace oxides are allowed for. A batch-specific Certificate of Analysis with the actual figures is issued for every shipment.

Feldspar — Grade Comparison by Oxide

The three analyses side by side, which is how a body or glaze recipe is actually proportioned. Total alkali sets how much feldspar the batch needs; the split between potash and soda sets how wide the firing window is; and iron sets how white the fired piece can be.

Typical oxide analysis of potassic, sodic and potassic-sodic feldspar grades
OxidePotassicSodicPotassic–Sodic
SiO₂67.40%69.50%70.80%
Al₂O₃17.85%16.20%15.60%
K₂O11.80%1.10%2.40%
Na₂O2.10%9.40%7.80%
Total Alkali13.90%10.50%10.20%
K₂O : Na₂O5.6 : 11 : 8.51 : 3.3
Fe₂O₃0.14%0.25%0.32%
CaO0.40%1.10%0.90%
MgO0.15%0.30%—
TiO₂0.04%0.07%—
Loss on Ignition0.35%0.70%0.85%

Total alkali and the potash-to-soda ratio are arithmetic on the two alkali figures above them, not separately measured values; the ratio is rounded to one decimal. A dash marks an oxide the blended grade’s analysis does not report — it is not a zero, and it has not been filled in from the other two columns. Where MgO or TiO₂ matters to your body, ask for it on the batch certificate at enquiry stage.

Bespoke Production

Need a tighter iron ceiling or a specific micron cut?

If none of the grades above matches your target chemistry, fineness, or packaging, tell us your requirements — we produce custom grades to your exact specification.

Request a Custom Grade

Applications

Feldspar is bought for the alkali it carries and the iron it does not. Which of the two alkalis dominates decides how wide the firing window is and how the melt behaves once it opens.

Flat & Container Glass

Alkali and alumina source; drops the batch melting point and cuts furnace fuel.

Porcelain Tile & Sanitaryware

Vitrifying flux forming the glassy phase that closes porosity in the body.

Tableware & Technical Porcelain

Body flux fired to translucency, where iron decides the achievable whiteness.

Glazes & Frits

Principal flux and glass former in raw glaze and frit recipes.

Welding Electrode Coating

Arc stabiliser and slag former in the flux coating of covered electrodes.

Fillers & Extenders

Low oil-absorption extender in paint, plastics, rubber and adhesive compounds.

Packaging, Logistics & Trading Terms

How we crush, grade, certify and ship feldspar. Terms can be adapted by agreement — tell us what your operation needs.

Minimum Order Quantity
1 × 20 ft container (approx. 25 MT) bagged. 500 MT minimum for bulk vessel. Trial quantities available for qualification.
Packaging
25 kg and 50 kg PP bags, 1–1.5 MT woven jumbo bags, or bulk. Lump and graded granular ship in bulk; micronized grades are bagged with a moisture-barrier liner on request.
Incoterms & Loading Ports
EXW, FOB, CFR and CIF (Incoterms® 2020). Standard loading at Bandar Abbas and Bandar Imam Khomeini; other ports by arrangement.
Quality Certification
Batch-specific CoA with every shipment covering K₂O, Na₂O, Al₂O₃, Fe₂O₃ and loss on ignition. SGS / Bureau Veritas inspection at buyer’s cost.
Lead Time
7–14 days for standard grades after order confirmation; 15–25 days for custom-milled or specially packed material.
Storage & Handling
Store under cover and keep dry. Feldspar is chemically inert and has no shelf-life limit, but damp powder cakes in the bag and will not disperse into a slip or a glaze suspension until it has been re-milled. Keep lump off bare ground — iron-bearing dirt picked up in the yard ends up in the mill, and the whole reason to buy a 0.14% iron feldspar is to keep it out.

Certificate of Analysis

A batch-specific CoA is issued with every shipment. Third-party inspection by SGS, Bureau Veritas or an inspector of your choice can be arranged at the buyer’s cost.

Ready to quote

Send us your grade, tonnage, destination port and packaging and we will return a firm FOB/CFR/CIF price with lead time.

Request a Feldspar Quote

Feldspar — Frequently Asked Questions

What is the difference between potassic and sodic feldspar?
Which alkali dominates, and what that does to the melt. The potassic grade runs 11.80% K₂O against 2.10% Na₂O; the sodic grade reverses it at 9.40% Na₂O against 1.10% K₂O. Potash feldspar melts to a stiffer, more viscous glass across a wide temperature range, which is forgiving — a glaze holds its place and a slow-fired porcelain body tolerates an uneven kiln. Soda feldspar melts lower and runs thinner, which is what a fast-fired porcelain tile line is built around. Total alkali is the other half of the answer: 13.90% against 10.50%, so the potassic grade does more fluxing per kilo added to the batch.
Why does the iron figure matter so much?
Because iron is the oxide that colours a fired body, and nothing downstream removes it. Fe₂O₃ is 0.14% on the potassic grade, 0.25% on the sodic and 0.32% on the blend — the difference between a body that fires white, one that fires cream and one that fires buff. In a glass batch the same oxide is what puts the green cast into the ware. Tell us your iron ceiling with the enquiry and we will quote only against faces that hold it, rather than quote the grade and argue about it later.
What does total alkali actually tell me?
It is K₂O plus Na₂O added together, and it is the single number a body formulator scales the feldspar addition on: 13.90% potassic, 10.50% sodic, 10.20% blended. A higher figure means less feldspar buys the same fluxing, which matters once you are costing a recipe by the tonne. What it does not tell you is how the melt behaves — that is the potash-to-soda split, which is why both are published.
Are these figures from a certificate of analysis?
No, and the page does not claim they are. They are typical production analyses for the faces we ship from. Feldspar is a quarried mineral, so the chemistry moves within a band across a working face rather than sitting on one certified number. Every shipment goes out against a batch-specific CoA carrying the figures for that material. It is also why the blended grade shows a dash for MgO and TiO₂: its analysis does not report them, and filling those cells in from the other two grades would be a guess dressed as a specification.
What sizes and forms do you supply?
Lump as quarried, crushed and graded granular, and micronized powder. There is no standing mesh range published here because the cut is the part buyers differ on most — a glass batch, a tile body and a glaze suspension all want something different. Send the screen range or micron cut your process needs and we will confirm what the plant can hold before quoting. Iron reduction by magnetic separation is arranged to order rather than held as a standard grade.
What is the minimum order quantity for feldspar?
One 20 ft container, approximately 25 MT, for bagged material. Bulk vessel shipments start at 500 MT. Trial quantities can be arranged so you can fire the feldspar in your own body or glaze before committing to a full order — which, given that the figures above are production bands rather than one certified lot, is the sensible way to qualify it.

Related Products

Silica (SiO₂) Quartz for the same glass and ceramic batch. Kaolin The china clay this flux vitrifies into a porcelain body. Dolomite Secondary flux and magnesia source in the same glass melt.