HS code · 6-digit subheading
HS Code 8405.90 – Generators; parts of producer gas, water gas, acetylene gas and similar water process gas generators, with or without their purifiers
HS code 8405.90 is the 6-digit subheading for generators, parts of producer gas, water gas, acetylene gas and similar water process gas generators, with or without their purifiers. It is used for generator nozzles, reaction chambers, purification filters, gas scrubbers and pressure regulators (for generators).
What HS 8405.90 covers
This HS code is dedicated to the parts of producer gas, water gas, acetylene gas, and similar water process gas generators, including their purifiers, as classified under 840510. These components are essential for the construction, maintenance, and repair of specialized industrial gas generation equipment. The trade in these parts supports the continuous operation of critical industrial processes worldwide, from chemical manufacturing to welding and energy production. Importers are typically industrial facilities, MRO providers, and equipment manufacturers who need specific components to build or service these complex generators. Exporters are often specialized manufacturers capable of producing high-precision parts for demanding industrial environments.
- Covers
- Generator nozzles
- Reaction chambers
- Purification filters
- Gas scrubbers
- Pressure regulators (for generators)
- Control valves (for generators)
- Refractory linings
- Catalyst beds
- Gasifier grates
- Examples
- Linde gasifier parts
- Air Products purification cartridges
- Messer Group acetylene generator spares
- Praxair valve assemblies (for gas generators)
Codes often confused with 8405.90
Common mistake. Often confused with parts of other gas handling machinery (841990) or general industrial valves (8481) if not clearly identified as specific to the generators classified under 840510.
Top exporters and importers of HS code 840590, 2025
In 2025, the largest exporter of HS code 840590 in UN Comtrade data was China, with 16% of world exports; the largest importer in UN Comtrade data was Italy, with 27% 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 $31M 16% of world exports
- 2 United States $24M 12% of world exports
- 3 United Kingdom $21M 11% of world exports
World total: $194M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Italy $70M 27% of world imports
- 2 Germany $22M 8.4% of world imports
- 3 Malaysia $16M 6.2% of world imports
World total: $256M 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 8405.90
Brazil does not split HS 8405.90: its NCM code is 8405.90.00.
All Brazil NCM codes in heading 84.05 →
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.
Questions about HS 8405.90
What is HS code 840590?
HS code 840590 is a 6-digit subheading in the Harmonized System that covers: Generators; parts of producer gas, water gas, acetylene gas and similar water process gas generators, with or without their purifiers. This HS code is dedicated to the parts of producer gas, water gas, acetylene gas, and similar water process gas generators, including their purifiers, as classified under 840510. These components are essential for the construction, maintenance, and repair of specialized industrial gas generation equipment. The trade in these parts supports the continuous operation of critical industrial processes worldwide, from chemical manufacturing to welding and energy production. Importers are typically industrial facilities, MRO providers, and equipment manufacturers who need specific components to build or service these complex generators. Exporters are often specialized manufacturers capable of producing high-precision parts for demanding industrial environments.
What products fall under HS code 840590?
Generator nozzles, reaction chambers, purification filters, gas scrubbers, pressure regulators (for generators), control valves (for generators), refractory linings, catalyst beds, gasifier grates
What are common misclassifications for HS code 840590?
Often confused with parts of other gas handling machinery (841990) or general industrial valves (8481) if not clearly identified as specific to the generators classified under 840510.
Which countries are the top exporters of goods under HS code 840590?
In 2025, the top exporters of HS code 840590 in UN Comtrade data were China ($31M, 16% of world exports), the United States ($24M) and the United Kingdom ($21M). World exports came to about $194M, 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 840590?
In 2025, the top importers of HS code 840590 in UN Comtrade data were Italy ($70M, 27% of world imports), Germany ($22M) and Malaysia ($16M). World imports came to about $256M, 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 840590 structured?
HS code 840590 is a 6-digit subheading under the Harmonized System. The first 2 digits (84) identify the chapter, digits 3-4 (05) 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 840590?
In Brazil, HS code 840590 is NCM 8405.90.00. The last two digits are 00 because Brazil does not split this HS code further.