Quarzo polare / Grana di quarzo (sabbia), grado 2

The product was obtained as a result of crushing and enrichment of vein quartz from the deposits of the Subpolar Urals. Coarseness: -0.315 + 0.1 mm. The content of the main substance (mass fraction of SiO2) is not less than 99.8%. The quality of the products corresponds to TU-5726-001-11496665-97 (optical glass-making), grains grade 2 Class E (Engineering)