Sodium pyrosulfite Sodium pyrosulfite Sodium pyrosulfite Sodium pyrosulfite disodium metabisulfite; Fertitilo; metabisulfitesodium; Sodium diummetabisulfite na2-s2o5; Sodium pyrosulfite na2s2o5; Sodium Dissulfite; Sodium pyrosulfite; Sodium Sodium Sulfite; Sodium Disulfite; Sodium Bisulfite; heavy oxygen; Sodium Sulfite; Sodium Sodium Metabisulfite; Sodium metabisulfite. APPEARANCE: White or yellowish crystalline powder or small crystal product specification: Sulfur Dioxide ≥65% iron ≤0.005% water insoluble substance ≤0.05% ph value: 4.0-4.6 chemical chemical name: Sodium metabisulfite class: Antioxidant.