Sodium Sulfate Anhydrous (Salt Cake)
Sodium sulfate anhydrous, also known as salt cake, is a white crystalline powder used in the glass, paper, and detergent industries as a filler and fluxing agent. It falls under HTS 2833.19.00.00 as 'other' sodium sulfates, distinct from Glauber's salt (sodium sulfate decahydrate) classified in 2833.11.50.00.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing 10 or more molecules of water of crystallization (Glauber's salt)
Hydrated sodium sulfate (decahydrate) is specifically classified under the Glauber's salt subheading.
If diammonium hydrogenorthophosphate or mixed with fertilizers
Fertilizer-grade sulfate mixtures fall under Chapter 31 as diammonium phosphate fertilizers.
If chemically defined mixtures for specific industrial preparations
Complex sulfate preparations not purely sodium sulfate are classified as chemical preparations.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Verify purity and anhydrous state via lab analysis to avoid misclassification as decahydrate under 2833.11
• Include Material Safety Data Sheets (MSDS) and certificates of analysis for customs clearance
• Check for hazardous material shipping requirements if in bulk quantities
Related Products under HTS 2833.19.00.00
Sodium Sulfate Decahydrate Technical Grade
Technical grade sodium sulfate decahydrate is a hydrated form used in heat packs and as a laboratory reagent, but classified here as 'other' when not meeting Glauber's salt criteria for purity or form. It fits HTS 2833.19.00.00 for sodium sulfates excluding the primary decahydrate subheading.
Sodium Bisulfate Monohydrate
Sodium bisulfate monohydrate (NaHSO4·H2O), also called niter cake, is an acid salt used for pH adjustment in pools, cleaning agents, and food processing. As a sodium sulfate derivative, it classifies under HTS 2833.19.00.00 for other sodium sulfates.
Trisodium Phosphate Dodecahydrate
No—persulfate is 2833.40. Sodium sulfate calcined powder for glass manufacturing, classified as 'other' under HTS 2833.19.00.00.