HS code · 6-digit subheading
HS Code 3810.90 – Fluxes and other auxiliary preparations; for soldering, brazing or welding, or preparations used as cores or coatings for welding electrodes or rods
HS code 3810.90 is the 6-digit subheading for fluxes and other auxiliary preparations, for soldering, brazing or welding, or preparations used as cores or coatings for welding electrodes or rods. It is used for rosin-based soldering flux, no-clean soldering flux, water-soluble soldering flux, brazing flux paste (non-metal) and welding electrode coatings.
What HS 3810.90 covers
This category encompasses fluxes and other auxiliary preparations for soldering, brazing, or welding, including preparations used as cores or coatings for welding electrodes or rods, but specifically excluding metal-containing powders and pastes. Fluxes are chemical agents that clean metal surfaces, prevent oxidation during heating, and improve the wetting and flow of molten solder or braze alloy, ensuring strong, reliable joints. Electrode coatings stabilize the arc, protect the weld pool from atmospheric contamination, and introduce alloying elements. Key participants in this trade are chemical suppliers, electronics manufacturers, metal fabricators, and construction companies. Critical aspects include flux activity levels, residue characteristics, and compatibility with various metals and joining techniques, driving innovation in welding and soldering technology.
- Covers
- Rosin-based soldering flux
- No-clean soldering flux
- Water-soluble soldering flux
- Brazing flux paste (non-metal)
- Welding electrode coatings
- Submerged arc welding flux
- Gas welding flux
- Examples
- Kester Flux
- Alpha Assembly Solutions Flux
- Indium Corporation Flux
- Lincoln Electric Flux
- ESAB Welding Flux
Codes often confused with 3810.90
Common mistake. Often confused with 381010 if the preparations contain metal powders or pastes, as 381010 specifically covers metal-containing soldering/brazing/welding powders and pastes.
Top exporters and importers of HS code 381090, 2025
In 2025, the largest exporter of HS code 381090 in UN Comtrade data was Germany, with 18% of world exports; the largest importer in UN Comtrade data was China, 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 Germany $164M 18% of world exports
- 2 Japan $159M 17% of world exports
- 3 China $86M 9.4% of world exports
World total: $921M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 China $120M 11% of world imports
- 2 Malaysia $105M 9.7% of world imports
- 3 Philippines $78M 7.2% of world imports
World total: $1.1B 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 code for 3810.90
Brazil does not split HS 3810.90: its NCM code is 3810.90.00.
All Brazil NCM codes in heading 38.10 →
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.
Questions about HS 3810.90
What is HS code 381090?
HS code 381090 is a 6-digit subheading in the Harmonized System that covers: Fluxes and other auxiliary preparations; for soldering, brazing or welding, or preparations used as cores or coatings for welding electrodes or rods. This category encompasses fluxes and other auxiliary preparations for soldering, brazing, or welding, including preparations used as cores or coatings for welding electrodes or rods, but specifically excluding metal-containing powders and pastes. Fluxes are chemical agents that clean metal surfaces, prevent oxidation during heating, and improve the wetting and flow of molten solder or braze alloy, ensuring strong, reliable joints. Electrode coatings stabilize the arc, protect the weld pool from atmospheric contamination, and introduce alloying elements. Key participants in this trade are chemical suppliers, electronics manufacturers, metal fabricators, and construction companies. Critical aspects include flux activity levels, residue characteristics, and compatibility with various metals and joining techniques, driving innovation in welding and soldering technology.
What products fall under HS code 381090?
Rosin-based soldering flux, No-clean soldering flux, Water-soluble soldering flux, Brazing flux paste (non-metal), Welding electrode coatings, Submerged arc welding flux, Gas welding flux
What are common misclassifications for HS code 381090?
Often confused with 381010 if the preparations contain metal powders or pastes, as 381010 specifically covers metal-containing soldering/brazing/welding powders and pastes.
Which countries are the top exporters of goods under HS code 381090?
In 2025, the top exporters of HS code 381090 in UN Comtrade data were Germany ($164M, 18% of world exports), Japan ($159M) and China ($86M). World exports came to about $921M, 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 381090?
In 2025, the top importers of HS code 381090 in UN Comtrade data were China ($120M, 11% of world imports), Malaysia ($105M) and the Philippines ($78M). World imports came to about $1.1B, 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 381090 structured?
HS code 381090 is a 6-digit subheading under the Harmonized System. The first 2 digits (38) identify the chapter, digits 3-4 (10) identify the heading, and digits 5-6 (90) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 381090?
In Brazil, HS code 381090 is NCM 3810.90.00. The last two digits are 00 because Brazil does not split this HS code further.