Sodium Thiosulfate Pentahydrate Crystals
Sodium thiosulfate pentahydrate (Na2S2O3·5H2O) is a colorless crystalline compound used primarily in photography as a fixer to remove unexposed silver halides from film. It falls under HTS 2832.30.10.00 as it is specifically the sodium salt of thiosulfuric acid, classified among thiosulfates in Chapter 28 for chemically defined inorganic compounds.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If stabilized with organic substances like starch or alcohol
Chapter note to 2832 excludes dithionites/sulfoxylates stabilized organically, directing them to 2831; thiosulfates with stabilizers follow this.
If as a double or complex salt with other metals/ammonium
Chapter note states complex salts of headings 2826-2842 go to 2842; a metal-thiosulfate complex changes from simple sodium thiosulfate.
If impure mixture or preparation for specific end-use like lab reagent
If not chemically defined or mixed with additives beyond pure compound specs, it falls under 3824 as chemical preparations, per Chapter exclusions.
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Import Tips & Compliance
• Verify purity and hydration state (e.g
• pentahydrate) via Certificate of Analysis to confirm classification under 2832.30.10.00 and avoid reclassification as anhydrous
• Include Safety Data Sheet (SDS) and proper UN packaging certification for Hazard Class 8 (corrosive) to prevent customs delays
• Label shipments clearly as 'Sodium Thiosulfate' to match HTS description; impure blends may shift to 2842 for complex salts
Related Products under HTS 2832.30.10.00
Anhydrous Sodium Thiosulfate Powder
Anhydrous sodium thiosulfate (Na2S2O3) is a white powder form of the compound used in gold extraction and as a dechlorinator in water treatment. Classified under HTS 2832.30.10.00 as the pure sodium thiosulfate salt, distinct from its hydrated forms but sharing the thiosulfate heading.
Sodium Thiosulfate for Photographic Fixing
High-purity sodium thiosulfate designed for use in photographic developers as a hypo fixer to dissolve silver halides. It is classified under HTS 2832.30.10.00 because it is chemically defined sodium thiosulfate, meeting Chapter 28 notes for inorganic sulfur compounds.
Aquarium Dechlorinator Sodium Thiosulfate
Concentrated sodium thiosulfate solution crystals for neutralizing chlorine in aquarium water to protect fish. It is the pure sodium thiosulfate under HTS 2832.30.10.00, classified by chemical identity regardless of aquarium labeling.
Industrial Grade Sodium Thiosulfate Flakes
Sodium thiosulfate flakes for industrial applications like paper bleaching and leather tanning, where it acts as an antichlor agent. Falls under HTS 2832.30.10.00 as the sodium thiosulfate subheading for chemically pure inorganic thiosulfates.
Pharmaceutical Grade Sodium Thiosulfate USP
USP-grade sodium thiosulfate meeting pharmacopeia standards for use as an antidote in cyanide poisoning treatment. Classified in HTS 2832.30.10.00 as chemically defined sodium thiosulfate, pure for medicinal purposes under Chapter 28.
Gold Mining Sodium Thiosulfate Extractant
Technical grade sodium thiosulfate used in cyanidation-free gold leaching processes as a lixiviant. HTS 2832.30.10.00 covers this as sodium thiosulfate for industrial metallurgy.