... manufacture & exporter of sodium metabisulphite, supply sodium metabisulfite food grade, sodium metabisulphite tech grade in high quality at competitive price.Uses: Mainly used as ... fixing agent, etc.Property: White crystal powder.Spec: Item Index Sodium Metabisulphite (Na2S2O5) (%) 97% Min Iron Content (Fe) (%) 0. ... 0005%Max As (%) 0.0001%Max manufacturer HIGH QUALITY Sodium Metabisulphite food grade