What are the key downstream applications and regulatory risks for sodium metabisulfite in China?
From a chemistry standpoint, sodium metabisulfite and sodium bisulfite are largely interchangeable in solution because both form bisulfite ions upon dissolution. This gives buyers flexibility in sourcing, but purity grades matter—industrial grade (96.5%) differs from food grade in allowable impurity levels. Always verify the intended application matches the product specification to avoid regulatory or performance issues.
