Tile · Sanitaryware · Glass
Feldspar
A stable alkali flux with low iron so ceramic bodies, glazes, and glass stay predictable in the fire.
The grade
Feldspar is the flux in ceramic tile, sanitaryware, and glass. A buyer is not looking for a romantic mineral. They are looking for alkali that stays put, iron that stays low, and a melt they have already planned the kiln or the furnace around.
When the alkali drifts, firing temperature drifts with it. Glaze fit moves. A glass batch that was balanced last month is no longer balanced. Low iron is the other half of the purchase: it is what keeps a white body white and a clear glass clear. Skylark Exports supplies feldspar on those terms, as a potash-side grade you can name in a recipe.
Pair it with silica sand in glass and with kaolin in a ceramic body. The table on this page is typical of the grade family. It is not a certificate of analysis, and it deliberately leaves the alkali percentage to the current sheet and to your trial.
What buyers check
- Alkali stable enough that the flux does not drift between lots
- Low iron so glaze and glass colour stay where the plant set them
- Firing behaviour a tile, sanitaryware, or glass buyer can plan around
- A named potash-side grade, not an unnamed “flux” bag
Applications
- Ceramics and tile
Tile, sanitaryware, and tableware plants use clay, feldspar, silica, and quartz so the body stays plastic and the fire stays predictable.
- Glass
Glass batches need silica that stays high and low in iron, plus a feldspar flux whose alkali does not drift.
Packing
- 25 kg bags, typical export packing, still to confirm
- 50 kg bags, typical export packing, still to confirm
- 1 MT jumbo bags, typical export packing, still to confirm
- Bulk, typical export packing, still to confirm
Questions buyers ask
Why does the alkali number matter?
Feldspar is the flux. If K2O and Na2O move, the body or the glaze matures at a different point and the glass melt changes. Buyers want that alkali stable from lot to lot, and they want the potash and soda split written on the sheet. This page states the requirement. It does not invent a percentage.
How low does iron need to be?
Iron colours glaze, sanitaryware, tile bodies, and glass. The acceptable Fe2O3 is the limit your colour standard allows. A typical ceramic and glass feldspar is a low-iron grade. Ask for the current figure and test it. Do not quote from this page.
Can one feldspar feed both tile and glass?
Sometimes the chemistry overlaps, and often it does not. Tile and sanitaryware care about firing shrinkage and glaze fit. Glass cares about alumina, alkali, and iron in the melt. Tell us which furnace or kiln it enters.
How is feldspar packed?
Typical export packing is 25 kg bags, 50 kg bags, 1 MT jumbo bags, or bulk. The packing Skylark offers is still to be confirmed. Name it, with quantity and destination port, in the quote request.
