Product classification

HS code for Polysulphide: 3911.90

Polysulphides, polysulphones and similar products of chemical synthesis n.e.c. in chapter 39, in primary forms.

Classification of polysulphide under HS 3911.90

Polysulphide polymers are classified under HS code 3911.90. This classification is determined by the General Rules for the Interpretation of the Harmonized System (GRI), specifically GRI 1 and 6. Chapter 39 covers plastics and articles thereof. Heading 3911 is designated for petroleum resins, coumarone-indene resins, polyterpenes, polysulphides, polysulphones, and other products of chemical synthesis not elsewhere specified or included, in primary forms. Since polysulphides are synthetic polymers that do not fall under the more specific headings of 3901 to 3910, they are categorized here. The primary forms designation refers to liquids and pastes, including dispersions and solutions, or blocks of irregular shape, lumps, powders, granules, flakes, and similar bulk forms. These polymers are valued for their chemical resistance and are frequently used in high-performance sealants and adhesives.

Covers
  • Liquid polysulphide polymers
  • Solid polysulphide resins in primary forms
  • Chemically synthesized polysulphide elastomers
  • Polysulphide dispersions and solutions
Also under 3911.90
  • Solvay Udel PSU
  • BASF Ultrason PES
  • Arkema Kynar PVDF (high-performance polymer)
  • Toray PPSU

Codes often confused with 3911.90

Common mistake. Polysulphides are frequently misclassified under HS code 4002, which covers synthetic rubber. However, 4002 is only applicable if the product meets specific vulcanization and elasticity criteria defined in Note 4 to Chapter 40. Additionally, prepared polysulphide sealants or caulking compounds are often incorrectly placed in 3911.90, but should actually be classified under HS code 3214.10 as glaziers' putty or sealing compounds.

40.02Synthetic rubber and factice derived from oils, in primary forms or in plates, sheets or strip; mixtures of heading no. 4001 and 4002, in primary forms or in plates, sheets or strip3214.10Mastics; painters' fillings

Top exporters and importers of HS 391190 (the code used for polysulphide), 2025

In 2025, the largest exporter of HS 391190 (the code used for polysulphide) in UN Comtrade data was Germany, with 20% of world exports; the largest importer in UN Comtrade data was China, with 15% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.

Figures cover everything classified under HS 391190, not only polysulphide.

Top exporters 2025 · share of world exports

  1. 1 Germany $1.0B
  2. 2 United States $872M
  3. 3 Japan $583M

World total: $5.2B Reported figures on UN Comtrade ↗

Top importers 2025 · share of world imports

  1. 1 China $769M
  2. 2 Germany $493M
  3. 3 United States $469M

World total: $5.2B 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 polysulphide

Brazil splits HS 3911.90 into 13 NCM codes. Pick the one that matches your product:

Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.

Questions about polysulphide

What is the HS code for Polysulphide?

The HS code for Polysulphide is 391190 (Polysulphides, polysulphones and similar products of chemical synthesis n.e.c. in chapter 39; in primary forms). The HS code for polysulphide in primary forms is 3911.90.

How do I classify Polysulphide for customs?

Polysulphide is classified under HS code 391190 — Polysulphides, polysulphones and similar products of chemical synthesis n.e.c. in chapter 39; in primary forms. This is a 6-digit subheading level code.

What is the difference between 3911 and 4002 for polymers?

Heading 3911 covers products of chemical synthesis like polysulphides in primary forms, while 4002 is reserved for synthetic rubbers that can be cross-linked with sulfur and meet specific recovery tests after stretching.

Which countries are the top exporters of polysulphide (HS 391190)?

In 2025, the top exporters of HS 391190 (the code used for polysulphide) in UN Comtrade data were Germany ($1.0B, 20% of world exports), the United States ($872M) and Japan ($583M). World exports came to about $5.2B, 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 polysulphide (HS 391190)?

In 2025, the top importers of HS 391190 (the code used for polysulphide) in UN Comtrade data were China ($769M, 15% of world imports), Germany ($493M) and the United States ($469M). World imports came to about $5.2B, 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.

Is the HS code for Polysulphide the same in all countries?

The base HS code 391190 for Polysulphide is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.

What is the NCM code for polysulphide in Brazil?

Brazil splits HS 391190 into 13 NCM codes, so the right one for polysulphide depends on the product's details: 3911.90.11 (Filled modified polyterpenes, not with phenols), 3911.90.12 (Filled polyetherimides (PEI) and copolymers), 3911.90.13 (Filled polyethersulphones (PES) and copolymers), 3911.90.14 (Filled poly(phenylene sulphide)), 3911.90.19 (Other filled polysulphones and similar polymers), 3911.90.21 (Unfilled modified polyterpenes, not with phenols), and more.