HS code · 6-digit subheading

HS Code 4106.31 – Tanned or crust hides and skins; of swine, without hair on, whether or not split, but not further prepared, in the wet state (including wet-blue)

HS code 4106.31 is the 6-digit subheading for tanned or crust hides and skins, of swine, without hair on, whether or not split, but not further prepared, in the wet state (including wet-blue). It is used for wet-blue pigskin for shoe linings, pigskin wet-blue for work gloves, pigskin wet-blue for garment interlinings, pigskin wet-blue for small leather goods and pigskin wet-blue for upholstery backing.

What HS 4106.31 covers

This category covers tanned or crust hides and skins of swine, specifically those without hair and in the 'wet-blue' state. Wet-blue indicates that the hides have been chrome-tanned but not yet dried, making them a semi-processed material ready for further finishing. Swine hides are known for their durability and are often used for linings, cheaper footwear, gloves, and some apparel where a robust yet economical leather is needed. China is a major player in both the production and consumption of these hides, with significant trade flows to other Asian manufacturing hubs. The 'wet-blue' state means they are typically traded in bulk to tanneries equipped for the subsequent drying and finishing stages, offering flexibility in final product characteristics.

Covers
  • Wet-blue pigskin for shoe linings
  • Pigskin wet-blue for work gloves
  • Pigskin wet-blue for garment interlinings
  • Pigskin wet-blue for small leather goods
  • Pigskin wet-blue for upholstery backing
  • Pigskin wet-blue for industrial gloves
Examples
  • Timberland (for boot linings)
  • Wolverine (for work gloves)
  • Coach (for internal components)
  • Samsonite (for luggage linings)
  • various automotive suppliers (for seat backing)

Codes often confused with 4106.31

Common mistake. Often confused with 410632 (dry state/crust) due to the difference in moisture content, or 4107 (finished leather) if the 'not further prepared' aspect is missed.

4106.32Tanned or crust hides and skins; of swine, without hair on, whether or not split, but not further prepared, in the dry state (crust)41.07Leather further prepared after tanning or crusting, including parchment-dressed leather, of bovine (including buffalo) or equine animals, without hair on, whether or not split, other than leather of heading 41.14

Top exporters and importers of HS code 410631, 2025

In 2025, the largest exporter of HS code 410631 in UN Comtrade data was Thailand, with 63% of world exports; the largest importer in UN Comtrade data was China, with 82% of world imports. Vietnam did not report 2025 data, and its estimate from partner records misses its trade with other countries that did not report: in 2024 that was 26% of its imports here ($1.1M, CEPII BACI), so it may rank higher.

Top exporters 2025 · share of world exports

  1. 1 Thailand $35M
  2. 2 Taiwan* ~$6.0M
  3. 3 Vietnam* ~$4.7M

World total: $55M Reported figures on UN Comtrade ↗

Top importers 2025 · share of world imports

  1. 1 China $46M
  2. 2 Taiwan* ~$3.9M
  3. 3 Vietnam* ~$3.2M

Vietnam did not report 2025 data, and its estimate from partner records misses its trade with other countries that did not report: in 2024 that was 26% of its imports here ($1.1M, CEPII BACI), so it may rank higher.

World total: $57M 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. UN Comtrade records Taiwan as "Other Asia, not elsewhere specified". Saudi Arabia's exports under that code are left out: they are far too large to be trade with Taiwan, so mostly undisclosed partners. 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 4106.31 2

Brazil splits HS 4106.31 into 2 NCM codes, Mercosur's 8-digit tariff lines.

  1. 4106.31.10 Wet-blue pigskins, simply chrome-tannedSimplesmente curtidos ao cromo (wet-blue)
  2. 4106.31.90 Other wet-state pigskinsOutros

All Brazil NCM codes in heading 41.06 →

Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.

Questions about HS 4106.31

What is HS code 410631?

HS code 410631 is a 6-digit subheading in the Harmonized System that covers: Tanned or crust hides and skins; of swine, without hair on, whether or not split, but not further prepared, in the wet state (including wet-blue). This category covers tanned or crust hides and skins of swine, specifically those without hair and in the 'wet-blue' state. Wet-blue indicates that the hides have been chrome-tanned but not yet dried, making them a semi-processed material ready for further finishing. Swine hides are known for their durability and are often used for linings, cheaper footwear, gloves, and some apparel where a robust yet economical leather is needed. China is a major player in both the production and consumption of these hides, with significant trade flows to other Asian manufacturing hubs. The 'wet-blue' state means they are typically traded in bulk to tanneries equipped for the subsequent drying and finishing stages, offering flexibility in final product characteristics.

What products fall under HS code 410631?

Wet-blue pigskin for shoe linings, Pigskin wet-blue for work gloves, Pigskin wet-blue for garment interlinings, Pigskin wet-blue for small leather goods, Pigskin wet-blue for upholstery backing, Pigskin wet-blue for industrial gloves

What are common misclassifications for HS code 410631?

Often confused with 410632 (dry state/crust) due to the difference in moisture content, or 4107 (finished leather) if the 'not further prepared' aspect is missed.

Which countries are the top exporters of goods under HS code 410631?

In 2025, the top exporters of HS code 410631 in UN Comtrade data were Thailand ($35M, 63% of world exports), Taiwan (about $6.0M) and Vietnam (about $4.7M). World exports came to about $55M, 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 410631?

In 2025, the top importers of HS code 410631 in UN Comtrade data were China ($46M, 82% of world imports), Taiwan (about $3.9M) and Vietnam (about $3.2M). World imports came to about $57M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Vietnam did not report 2025 data, and its estimate from partner records misses its trade with other countries that did not report: in 2024 that was 26% of its imports here ($1.1M, CEPII BACI), so it may rank higher.

How is HS code 410631 structured?

HS code 410631 is a 6-digit subheading under the Harmonized System. The first 2 digits (41) identify the chapter, digits 3-4 (06) identify the heading, and digits 5-6 (31) specify the subheading. This code is standardized globally by the World Customs Organization.

What is the Brazil NCM code for HS code 410631?

Brazil splits HS code 410631 into 2 NCM codes: 4106.31.10 (Wet-blue pigskins, simply chrome-tanned), 4106.31.90 (Other wet-state pigskins). The first 6 digits of each match the HS code.