HS code · 6-digit subheading
HS Code 3903.20 – Styrene polymers; styrene-acrylonitrile (SAN) copolymers, in primary forms
HS code 3903.20 is the 6-digit subheading for styrene polymers, styrene-acrylonitrile (SAN) copolymers, in primary forms. It is used for SAN pellets, high-clarity SAN, UV-stabilized SAN, food-contact SAN and injection molding SAN.
What HS 3903.20 covers
This code covers styrene-acrylonitrile (SAN) copolymers in their primary forms, typically pellets or granules. SAN is a transparent, rigid, and chemical-resistant engineering thermoplastic, offering better heat resistance and mechanical properties than general-purpose polystyrene. It's a niche but important material in international trade, primarily exported by specialized chemical producers and imported by manufacturers of household goods (e.g., blender jars), automotive parts (e.g., instrument panels), medical devices, and transparent packaging. Key trade aspects include the demand for high-performance transparent plastics, the impact of acrylonitrile monomer prices, and the need for specific grades tailored to end-use applications requiring clarity and chemical resistance.
- Covers
- SAN pellets
- High-clarity SAN
- UV-stabilized SAN
- Food-contact SAN
- Injection molding SAN
- Extrusion grade SAN
- Chemical-resistant SAN
- Examples
- Trinseo Tyril SAN
- INEOS Styrolution Luran SAN
- LG Chem SAN
- Chi Mei Polylac SAN
- Toray SAN
Codes often confused with 3903.20
Common mistake. Can be confused with 390319 (other polystyrene) if the acrylonitrile component is overlooked, or with 390330 (ABS copolymers) if the butadiene rubber phase is not present.
Top exporters and importers of HS code 390320, 2025
In 2025, the largest exporter of HS code 390320 in UN Comtrade data was South Korea, with 37% of world exports; the largest importer in UN Comtrade data was China, with 19% 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 South Korea $263M 37% of world exports
- 2 Taiwan* ~$104M 15% of world exports · partner records ↗
- 3 China $83M 12% of world exports
World total: $709M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 China $157M 19% of world imports
- 2 India $72M 8.5% of world imports
- 3 United States $62M 7.3% of world imports
World total: $847M 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 code for 3903.20
Brazil does not split HS 3903.20: its NCM code is 3903.20.00.
All Brazil NCM codes in heading 39.03 →
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.
Questions about HS 3903.20
What is HS code 390320?
HS code 390320 is a 6-digit subheading in the Harmonized System that covers: Styrene polymers; styrene-acrylonitrile (SAN) copolymers, in primary forms. This code covers styrene-acrylonitrile (SAN) copolymers in their primary forms, typically pellets or granules. SAN is a transparent, rigid, and chemical-resistant engineering thermoplastic, offering better heat resistance and mechanical properties than general-purpose polystyrene. It's a niche but important material in international trade, primarily exported by specialized chemical producers and imported by manufacturers of household goods (e.g., blender jars), automotive parts (e.g., instrument panels), medical devices, and transparent packaging. Key trade aspects include the demand for high-performance transparent plastics, the impact of acrylonitrile monomer prices, and the need for specific grades tailored to end-use applications requiring clarity and chemical resistance.
What products fall under HS code 390320?
SAN pellets, high-clarity SAN, UV-stabilized SAN, food-contact SAN, injection molding SAN, extrusion grade SAN, chemical-resistant SAN
What are common misclassifications for HS code 390320?
Can be confused with 390319 (other polystyrene) if the acrylonitrile component is overlooked, or with 390330 (ABS copolymers) if the butadiene rubber phase is not present.
Which countries are the top exporters of goods under HS code 390320?
In 2025, the top exporters of HS code 390320 in UN Comtrade data were South Korea ($263M, 37% of world exports), Taiwan (about $104M) and China ($83M). World exports came to about $709M, 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 390320?
In 2025, the top importers of HS code 390320 in UN Comtrade data were China ($157M, 19% of world imports), India ($72M) and the United States ($62M). World imports came to about $847M, 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 390320 structured?
HS code 390320 is a 6-digit subheading under the Harmonized System. The first 2 digits (39) identify the chapter, digits 3-4 (03) identify the heading, and digits 5-6 (20) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 390320?
In Brazil, HS code 390320 is NCM 3903.20.00. The last two digits are 00 because Brazil does not split this HS code further.