Product classification
HS code for Rubber stabilizers: 3812.39
Anti-oxidising preparations and other compound stabilisers, for rubber or plastics, other than mixtures of oligomers of 2,2,4-trimethyl-1,2-dihydroquinoline (TMQ).
Classification of rubber stabilizers under HS 3812.39
HS code 381239 is designated for anti-oxidising preparations and other compound stabilizers specifically formulated for rubber or plastics. These are chemical mixtures used to prevent degradation from heat, light, or oxidation during processing or throughout the product's lifecycle. Classification here is based on the functional application of the chemical preparation. According to the Explanatory Notes to Chapter 38, heading 3812 covers prepared rubber accelerators, compound plasticizers, and anti-oxidising preparations. Subheading 381239 is a residual category for stabilizers that do not consist of mixtures of oligomers of 2,2,4-trimethyl-1,2-dihydroquinoline (TMQ), which are specifically carved out into 381231. These stabilizers are essential in the rubber industry to ensure the longevity and durability of vulcanized products. They are typically complex mixtures of various chemical agents designed to inhibit the free radical reactions that lead to polymer chain scission or cross-linking. The classification requires that the product be a "preparation" or a "compound," meaning it must consist of two or more ingredients mixed together. Single, chemically defined elements or compounds are generally excluded from this chapter and are instead classified in Chapter 28 or 29. Therefore, the chemical composition and the intended use as a stabilizer for rubber or plastics are the primary drivers for selecting 381239.
- Covers
- Compound UV stabilizers for rubber
- Anti-oxidant mixtures for vulcanized rubber
- Heat stabilizers for plastic and rubber compounds
- Light stabilizers for synthetic rubber
- Blended chemical preparations to prevent rubber aging
- Also under 3812.39
- Irganox 1010
- Tinuvin 770
- Weston 618
- Songnox 1076
- Doverphos S-9228
Codes often confused with 3812.39
Common mistake. Rubber stabilizers are often misclassified under Chapter 29 (Organic Chemicals) if the importer believes the product is a single chemical compound. For example, a pure antioxidant like BHT would fall under 2907, whereas a mixture containing BHT for use in rubber would fall under 381239. Another common error is confusing these with rubber accelerators classified under 381210. Furthermore, mixtures containing TMQ must be classified under 381231, not 381239, due to the specific 2022 HS nomenclature updates.
Top exporters and importers of HS 381239 (the code used for rubber stabilizers), 2025
In 2025, the largest exporter of HS 381239 (the code used for rubber stabilizers) in UN Comtrade data was China, with 19% of world exports; the largest importer in UN Comtrade data was the United States, with 8.7% 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 381239, not only rubber stabilizers.
Top exporters 2025 · share of world exports
- 1 China $598M 19% of world exports
- 2 Germany $420M 13% of world exports
- 3 United States $296M 9.3% of world exports
World total: $3.2B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 United States $316M 8.7% of world imports
- 2 Germany $252M 7.0% of world imports
- 3 China $239M 6.6% of world imports
World total: $3.6B 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 rubber stabilizers
Brazil splits HS 3812.39 into 5 NCM codes. Pick the one that matches your product:
- 3812.39.11N-substituted p-phenylenediamines for rubber
- 3812.39.12Phosphite antioxidants for rubber
- 3812.39.19Other rubber antioxidants and stabilisers
- 3812.39.21N-substituted p-phenylenediamines for plastics
- 3812.39.29Other plastics antioxidants and stabilisers
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about rubber stabilizers
What is the HS code for Rubber stabilizers?
The HS code for Rubber stabilizers is 381239 (Anti-oxidising preparations and other compound stabilisers; for rubber or plastics, other than mixtures of oligomers of 2,2,4-trimethyl-1,2-dihydroquinoline (TMQ)). The HS code for compound rubber stabilizers and anti-oxidising preparations is 381239.
How do I classify Rubber stabilizers for customs?
Rubber stabilizers is classified under HS code 381239 — Anti-oxidising preparations and other compound stabilisers; for rubber or plastics, other than mixtures of oligomers of 2,2,4-trimethyl-1,2-dihydroquinoline (TMQ). This is a 6-digit subheading level code.
Are single chemical antioxidants classified here?
No, single chemically defined antioxidants are typically classified in Chapter 29. HS code 381239 is reserved for mixtures and compound preparations.
Which countries are the top exporters of rubber stabilizers (HS 381239)?
In 2025, the top exporters of HS 381239 (the code used for rubber stabilizers) in UN Comtrade data were China ($598M, 19% of world exports), Germany ($420M) and the United States ($296M). World exports came to about $3.2B, 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 rubber stabilizers (HS 381239)?
In 2025, the top importers of HS 381239 (the code used for rubber stabilizers) in UN Comtrade data were the United States ($316M, 8.7% of world imports), Germany ($252M) and China ($239M). World imports came to about $3.6B, 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 Rubber stabilizers the same in all countries?
The base HS code 381239 for Rubber stabilizers 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 rubber stabilizers in Brazil?
Brazil splits HS 381239 into 5 NCM codes, so the right one for rubber stabilizers depends on the product's details: 3812.39.11 (N-substituted p-phenylenediamines for rubber), 3812.39.12 (Phosphite antioxidants for rubber), 3812.39.19 (Other rubber antioxidants and stabilisers), 3812.39.21 (N-substituted p-phenylenediamines for plastics), 3812.39.29 (Other plastics antioxidants and stabilisers).