HS code · 6-digit subheading
HS Code 8439.91 – Machinery; parts of machinery for making pulp of fibrous cellulosic material
HS code 8439.91 is the 6-digit subheading for machinery, parts of machinery for making pulp of fibrous cellulosic material. It is used for digester linings, refiner plates, chipper knives, screen baskets and pump impellers.
What HS 8439.91 covers
This HS code specifically covers parts of machinery for making pulp of fibrous cellulosic material, as classified under 843910. These components are vital for the maintenance, repair, and upgrade of the heavy industrial equipment found in pulp mills. This includes specialized parts for digesters, refiners, debarkers, and washing systems, which are subject to extreme conditions and wear. The availability of these parts is critical for minimizing downtime and ensuring the continuous, efficient operation of pulp production lines. Importers are pulp mills worldwide, seeking to maintain their capital-intensive machinery. Exporters are typically the same countries that manufacture the original pulping equipment, such as Finland, Sweden, and Germany, leveraging their expertise in specialized industrial components and global supply chains. Trade in these parts supports the foundational stage of the paper industry.
- Covers
- Digester linings
- Refiner plates
- Chipper knives
- Screen baskets
- Pump impellers
- Debarking drums
- Washing filters
- Bleaching system components
- Examples
- Valmet pulp mill spare parts
- Andritz refiner segments
- Voith pulping system components
- Kadant stock prep parts
Codes often confused with 8439.91
Common mistake. Could be confused with 843999 (parts for paper/paperboard making/finishing machinery) if the distinction between pulp-specific parts and general paper machine parts is not clear. The '91' suffix specifically denotes pulp-making parts.
Top exporters and importers of HS code 843991, 2025
In 2025, the largest exporter of HS code 843991 in UN Comtrade data was Finland, with 19% of world exports; the largest importer in UN Comtrade data was the United States, with 13% 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 Finland $176M 19% of world exports
- 2 China $142M 15% of world exports
- 3 Germany $131M 14% of world exports
World total: $933M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 United States $105M 13% of world imports
- 2 Sweden $58M 7.1% of world imports
- 3 Canada $55M 6.7% of world imports
World total: $824M 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 8439.91
Brazil does not split HS 8439.91: its NCM code is 8439.91.00.
All Brazil NCM codes in heading 84.39 →
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.
Questions about HS 8439.91
What is HS code 843991?
HS code 843991 is a 6-digit subheading in the Harmonized System that covers: Machinery; parts of machinery for making pulp of fibrous cellulosic material. This HS code specifically covers parts of machinery for making pulp of fibrous cellulosic material, as classified under 843910. These components are vital for the maintenance, repair, and upgrade of the heavy industrial equipment found in pulp mills. This includes specialized parts for digesters, refiners, debarkers, and washing systems, which are subject to extreme conditions and wear. The availability of these parts is critical for minimizing downtime and ensuring the continuous, efficient operation of pulp production lines. Importers are pulp mills worldwide, seeking to maintain their capital-intensive machinery. Exporters are typically the same countries that manufacture the original pulping equipment, such as Finland, Sweden, and Germany, leveraging their expertise in specialized industrial components and global supply chains. Trade in these parts supports the foundational stage of the paper industry.
What products fall under HS code 843991?
Digester linings, refiner plates, chipper knives, screen baskets, pump impellers, debarking drums, washing filters, bleaching system components
What are common misclassifications for HS code 843991?
Could be confused with 843999 (parts for paper/paperboard making/finishing machinery) if the distinction between pulp-specific parts and general paper machine parts is not clear. The '91' suffix specifically denotes pulp-making parts.
Which countries are the top exporters of goods under HS code 843991?
In 2025, the top exporters of HS code 843991 in UN Comtrade data were Finland ($176M, 19% of world exports), China ($142M) and Germany ($131M). World exports came to about $933M, 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 843991?
In 2025, the top importers of HS code 843991 in UN Comtrade data were the United States ($105M, 13% of world imports), Sweden ($58M) and Canada ($55M). World imports came to about $824M, 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 843991 structured?
HS code 843991 is a 6-digit subheading under the Harmonized System. The first 2 digits (84) identify the chapter, digits 3-4 (39) identify the heading, and digits 5-6 (91) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 843991?
In Brazil, HS code 843991 is NCM 8439.91.00. The last two digits are 00 because Brazil does not split this HS code further.