HS code · 6-digit subheading
HS Code 2835.10 – Phosphinates (hypophosphites) and phosphonates (phosphites), whether or not chemically defined
HS code 2835.10 is the 6-digit subheading for phosphinates (hypophosphites) and phosphonates (phosphites), whether or not chemically defined. It is used for sodium hypophosphite, calcium hypophosphite, manganese hypophosphite, triphenyl phosphite and dimethyl phosphite.
What HS 2835.10 covers
This HS code covers phosphinates (hypophosphites) and phosphonates (phosphites), which are salts and esters derived from hypophosphorous acid and phosphorous acid, respectively. These compounds are critical in various industrial applications. Hypophosphites, such as sodium hypophosphite, are widely employed as powerful reducing agents, particularly in electroless nickel plating processes essential for electronics and automotive components. Phosphites, like triphenyl phosphite, serve as effective stabilizers in polymers, antioxidants, and as ligands in catalysis. Chemical manufacturers, electronics companies, and polymer producers are key importers and exporters of these specialized chemicals. Trade in these compounds demands high purity and specific formulations tailored for their advanced manufacturing roles. Key considerations include their often-hazardous nature, necessitating careful handling and transport, and their integral role in high-tech production processes.
- Covers
- Sodium hypophosphite
- Calcium hypophosphite
- Manganese hypophosphite
- Triphenyl phosphite
- Dimethyl phosphite
- Diethyl phosphite
- Tris(nonylphenyl)phosphite
- Examples
- Electroless Nickel Plating Solutions (Atotech, MacDermid Enthone)
- Polymer Stabilizers (BASF, Songwon)
- Antioxidants (various chemical suppliers)
- Chemical Intermediates
Codes often confused with 2835.10
Common mistake. These compounds are distinct from phosphates (2835.2x) due to their different oxidation states of phosphorus and chemical structures, leading to different applications.
Top exporters and importers of HS code 283510, 2025
In 2025, the largest exporter of HS code 283510 in UN Comtrade data was China, with 43% of world exports; the largest importer in UN Comtrade data was Malaysia, with 11% 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 $122M 43% of world exports
- 2 Indonesia $107M 38% of world exports
- 3 Switzerland $8.0M 2.8% of world exports
World total: $284M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Malaysia $21M 11% of world imports
- 2 United States $20M 11% of world imports
- 3 Germany $16M 8.9% of world imports
World total: $181M 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 that did not report are estimated from what other countries recorded trading with them. 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 2835.10 4
Brazil splits HS 2835.10 into 4 NCM codes, Mercosur's 8-digit tariff lines.
- 2835.10.1 Phosphinates (hypophosphites)Fosfinatos (hipofosfitos) Group
- 2835.10.11 Sodium phosphinate (hypophosphite)De sódio
- 2835.10.19 Other phosphinates (hypophosphites)Outros
- 2835.10.2 Phosphonates (phosphites)Fosfonatos (fosfitos) Group
- 2835.10.21 Dibasic lead phosphonate (phosphite)Dibásico de chumbo
- 2835.10.29 Other phosphonates (phosphites)Outros
All Brazil NCM codes in heading 28.35 →
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.
Questions about HS 2835.10
What is HS code 283510?
HS code 283510 is a 6-digit subheading in the Harmonized System that covers: Phosphinates (hypophosphites) and phosphonates (phosphites), whether or not chemically defined. This HS code covers phosphinates (hypophosphites) and phosphonates (phosphites), which are salts and esters derived from hypophosphorous acid and phosphorous acid, respectively. These compounds are critical in various industrial applications. Hypophosphites, such as sodium hypophosphite, are widely employed as powerful reducing agents, particularly in electroless nickel plating processes essential for electronics and automotive components. Phosphites, like triphenyl phosphite, serve as effective stabilizers in polymers, antioxidants, and as ligands in catalysis. Chemical manufacturers, electronics companies, and polymer producers are key importers and exporters of these specialized chemicals. Trade in these compounds demands high purity and specific formulations tailored for their advanced manufacturing roles. Key considerations include their often-hazardous nature, necessitating careful handling and transport, and their integral role in high-tech production processes.
What products fall under HS code 283510?
Sodium hypophosphite, Calcium hypophosphite, Manganese hypophosphite, Triphenyl phosphite, Dimethyl phosphite, Diethyl phosphite, Tris(nonylphenyl)phosphite
What are common misclassifications for HS code 283510?
These compounds are distinct from phosphates (2835.2x) due to their different oxidation states of phosphorus and chemical structures, leading to different applications.
Which countries are the top exporters of goods under HS code 283510?
In 2025, the top exporters of HS code 283510 in UN Comtrade data were China ($122M, 43% of world exports), Indonesia ($107M) and Switzerland ($8.0M). World exports came to about $284M, 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 283510?
In 2025, the top importers of HS code 283510 in UN Comtrade data were Malaysia ($21M, 11% of world imports), the United States ($20M) and Germany ($16M). World imports came to about $181M, 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 283510 structured?
HS code 283510 is a 6-digit subheading under the Harmonized System. The first 2 digits (28) identify the chapter, digits 3-4 (35) 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 283510?
Brazil splits HS code 283510 into 4 NCM codes: 2835.10.11 (Sodium phosphinate (hypophosphite)), 2835.10.19 (Other phosphinates (hypophosphites)), 2835.10.21 (Dibasic lead phosphonate (phosphite)), 2835.10.29 (Other phosphonates (phosphites)). The first 6 digits of each match the HS code.