India Silica : Washed Silica Sand
Silica sand is produced by crushing sand stone or quartzite of open texture, and washing and garding it to yield requisite grain distribution. Silica flour is produced by crushing grinding and washing the high grade quartz, quartzite rocks or from white silica sand. SiO2 . 98% min. Al2O3 . 1.5% max. Fe2O3 . 0.5% max.