钠dithionite

Specification: itemsIndustrial GradeFood Grade85%88%90%85%88%90%AppearanceWhite crystalline powderodorOdorless or with a slight odor of sulfur dioxide Na2S2O4 %≥85≥88≥90≥85≥88≥90Water Insolubles%≤0.2≤0.2≤0.2≤0.1≤0.1≤0.1Heavy Metal Contentppm≤1≤1≤1≤1≤1≤1Na2CO3 (%)0.9-5.00.9-5.00.9-5.00.9-5.00.9-5.00.9-5.0Fe(ppm)≤20≤20≤20≤20≤20≤20Shelf life (Months)121212121212 Package: 50kg per iron drum.