2833.11 - Disodium sulfate:

This HTS category, 2833.11, specifically covers **disodium sulfate**. Disodium sulfate, also known as sodium sulfate anhydrous or sodium sulfate decahydrate, is a chemical compound primarily used in the manufacture of detergents, glass, paper pulp, and textiles. Its classification here is within the broader group of sodium sulfates, which are salts derived from sulfuric acid and sodium.

Disodium sulfate is distinguished from its sibling category, 2833.19, which encompasses "Other" sodium sulfates. While 2833.11 is exclusively for disodium sulfate, the "Other" category would include sodium sulfates that are not disodium sulfate, such as sodium bisulfate (sodium hydrogen sulfate) or sodium metabisulfite. The key differentiator lies in the specific chemical composition and the ratio of sodium to sulfate ions.

Within this disodium sulfate classification, further subdivisions exist to provide more granular detail. The subcategory 2833.11.10.00 designates "Salt cake," which is a technical grade of anhydrous sodium sulfate often produced as a byproduct of other industrial processes and commonly used in the paper and detergent industries. The subcategory 2833.11.50 covers "Other" forms of disodium sulfate not specifically defined as salt cake, allowing for the classification of other preparations or purities of this compound.