Iron oxide (Fe2O3) is one of the most closely watched impurities in glass-grade silica sand. Even small increases in PPM can shift colour, raise scrap rates, and weaken optical performance in float and solar glass.
Why buyers specify PPM limits
Glassmakers typically demand Fe2O3 in the low hundreds of PPM. At Stone Skipper, multi-stage magnetic separation supports Fe2O3 as low as 100 PPM, with SiO2 ≥ 99%.
Lower iron → cleaner melt colour
More stable viscosity and furnace behaviour
Better yield for float and solar lines
How we control iron
Incoming silica is washed, scrubbed, and processed through staged magnetic roller separators before screening to grade. Batch chemistry is verified before shipment so buyers receive sand that matches the agreed specification.
Need a datasheet or sample for your furnace program? Share your Fe2O3 and particle-size targets and we will respond with options from Mundra and Kandla.
