Salt Cake (Sodium Sulfate Anhydrous)
Salt cake is the commercial name for disodium sulfate (Na2SO4) in its anhydrous form, produced as a by-product in chemical manufacturing processes like hydrochloric acid production. It falls under HTS 2833.11.10.00 as it is specifically defined as 'salt cake,' a crude or technical grade of sodium sulfate distinct from refined versions.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If refined or high-purity grade
Refined disodium sulfate exceeding technical grade purity falls under 'Other' sodium sulfates, not specifically 'salt cake'
If containing alum or impurities classifying as alums
Products meeting alum definitions (double sulfates) shift to alum subheadings regardless of sodium sulfate base
If formulated as fertilizer
Sodium sulfate mixed with fertilizers for agricultural use moves to Chapter 31 per chapter exclusion notes
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Import Tips & Compliance
• Verify purity levels as salt cake is typically under 99% Na2SO4 to avoid reclassification as refined sodium sulfate; obtain Certificate of Analysis from supplier
• Ensure bulk packaging complies with DOT hazardous material regs if moisture-reactive
• Common pitfall: mislabeling as 'Glauber's salt' which may shift to decahydrate subheading
Related Products under HTS 2833.11.10.00
Industrial Salt Cake for Glass Manufacturing
Coarse-grained salt cake used primarily as a flux in flat glass production to lower melting temperatures of silica. Classified under HTS 2833.11.10.00 due to its identification as 'salt cake,' the standard technical grade sodium sulfate for industrial applications.
Technical Grade Salt Cake for Detergent Production
Salt cake serving as filler and processing aid in powdered laundry detergent formulations, providing bulk and flow properties. HTS 2833.11.10.00 applies as it's the designated subheading for this commercial form of disodium sulfate.
Salt Cake By-Product from HCl Production
Crystalline salt cake generated as waste from the Mannheim process for hydrochloric acid manufacture from sodium chloride. Specifically provided for under HTS 2833.11.10.00 as 'salt cake,' distinguishing it from purified sodium sulfate.
Kraft Pulping Grade Salt Cake
Technical sodium sulfate (salt cake) used in sulfate pulp mills to regenerate cooking liquor during kraft paper production. Falls under HTS 2833.11.10.00 as the standard 'salt cake' specification for this essential pulping chemical.
Glass Batch Salt Cake Additive
Granular salt cake incorporated into glass batch compositions as a fining agent and viscosity modifier. HTS 2833.11.10.00 classification applies to this technical grade disodium sulfate known commercially as salt cake.
Textile Dyeing Salt Cake
Coarse salt cake used as mordant and leveling agent in reactive dyeing of cotton and cellulosic fibers. Provided for under HTS 2833.11.10.00 as the designated subheading for commercial salt cake.