HS code · 6-digit subheading
HS Code 2831.10 – Dithionites and sulphoxylates; of sodium
HS code 2831.10 is the 6-digit subheading for dithionites and sulphoxylates, of sodium. It is used for sodium dithionite powder, sodium formaldehyde sulphoxylate (SFS), rongalite, sodium hydroxymethanesulphinate and hydrosulphite.
What HS 2831.10 covers
Sodium dithionite and sodium sulphoxylate are powerful reducing agents widely traded internationally, primarily for their critical applications in the textile industry for dyeing and bleaching, and in the pulp and paper industry. They are also utilized in various chemical syntheses and as effective oxygen scavengers. Countries with significant textile manufacturing, such as India, China, and Bangladesh, are major importers, relying heavily on these chemicals for their processing needs. Exporters are typically large chemical producers with advanced manufacturing capabilities, including China, Germany, and the USA. Key trade considerations involve ensuring proper packaging to prevent decomposition (especially for dithionite, which is sensitive to moisture and air), safe handling due to its flammability and potential for self-heating, and strict compliance with international hazardous materials regulations. The market for these compounds is closely tied to the health and activity of the global textile and paper industries.
- Covers
- Sodium dithionite powder
- Sodium formaldehyde sulphoxylate (SFS)
- Rongalite
- Sodium hydroxymethanesulphinate
- Hydrosulphite
- Sodium dithionite solution
- Examples
- BASF Sodium Dithionite
- Arkema Sodium Dithionite
- Sigma-Aldrich Sodium Formaldehyde Sulphoxylate
- Huntsman Textile Effects Dithionite
Codes often confused with 2831.10
Common mistake. This code is specific to sodium dithionites and sulphoxylates and should not be confused with other dithionites/sulphoxylates (283190) or other sulfur compounds like sulphites (2832xx).
Top exporters and importers of HS code 283110, 2025
In 2025, the largest exporter of HS code 283110 in UN Comtrade data was China, with 54% of world exports; the largest importer in UN Comtrade data was Türkiye, with 12% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Top exporters 2025 · share of world exports
- 1 China $96M 54% of world exports
- 2 India $36M 20% of world exports
- 3 Belgium $28M 16% of world exports
World total: $178M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Türkiye $29M 12% of world imports
- 2 Vietnam* ~$19M 7.9% of world imports · partner records ↗
- 3 United States $14M 5.8% of world imports
World total: $239M Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries marked * did not, so their figures add up what other countries recorded trading with them, and their exports are valued at buyers' CIF prices. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM codes for 2831.10 4
Brazil splits HS 2831.10 into 4 NCM codes, Mercosur's 8-digit tariff lines.
- 2831.10.1 Dithionites (hydrosulphites)Ditionitos (hidrossulfitos) Group
- 2831.10.11 Stabilised sodium dithioniteEstabilizados
- 2831.10.19 Other sodium dithionitesOutros
- 2831.10.2 SulphoxylatesSulfoxilatos Group
- 2831.10.21 Sodium formaldehyde sulphoxylateEstabilizados com formaldeído
- 2831.10.29 Other sodium sulphoxylatesOutros
All Brazil NCM codes in heading 28.31 →
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.
Questions about HS 2831.10
What is HS code 283110?
HS code 283110 is a 6-digit subheading in the Harmonized System that covers: Dithionites and sulphoxylates; of sodium. Sodium dithionite and sodium sulphoxylate are powerful reducing agents widely traded internationally, primarily for their critical applications in the textile industry for dyeing and bleaching, and in the pulp and paper industry. They are also utilized in various chemical syntheses and as effective oxygen scavengers. Countries with significant textile manufacturing, such as India, China, and Bangladesh, are major importers, relying heavily on these chemicals for their processing needs. Exporters are typically large chemical producers with advanced manufacturing capabilities, including China, Germany, and the USA. Key trade considerations involve ensuring proper packaging to prevent decomposition (especially for dithionite, which is sensitive to moisture and air), safe handling due to its flammability and potential for self-heating, and strict compliance with international hazardous materials regulations. The market for these compounds is closely tied to the health and activity of the global textile and paper industries.
What products fall under HS code 283110?
Sodium dithionite powder, Sodium formaldehyde sulphoxylate (SFS), Rongalite, Sodium hydroxymethanesulphinate, Hydrosulphite, Sodium dithionite solution
What are common misclassifications for HS code 283110?
This code is specific to sodium dithionites and sulphoxylates and should not be confused with other dithionites/sulphoxylates (283190) or other sulfur compounds like sulphites (2832xx).
Which countries are the top exporters of goods under HS code 283110?
In 2025, the top exporters of HS code 283110 in UN Comtrade data were China ($96M, 54% of world exports), India ($36M) and Belgium ($28M). World exports came to about $178M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Which countries are the top importers of goods under HS code 283110?
In 2025, the top importers of HS code 283110 in UN Comtrade data were Türkiye ($29M, 12% of world imports), Vietnam (about $19M) and the United States ($14M). World imports came to about $239M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
How is HS code 283110 structured?
HS code 283110 is a 6-digit subheading under the Harmonized System. The first 2 digits (28) identify the chapter, digits 3-4 (31) identify the heading, and digits 5-6 (10) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 283110?
Brazil splits HS code 283110 into 4 NCM codes: 2831.10.11 (Stabilised sodium dithionite), 2831.10.19 (Other sodium dithionites), 2831.10.21 (Sodium formaldehyde sulphoxylate), 2831.10.29 (Other sodium sulphoxylates). The first 6 digits of each match the HS code.