# HS code 3903.20: Styrene-acrylonitrile (SAN) copolymers

> HS code 3903.20 covers styrene-acrylonitrile (SAN) copolymers. It sits in heading 39.03 (polymers of styrene, in primary forms) in chapter 39 (plastics and articles thereof). Other goods of heading 39.03 are classified under 3903.11 (polystyrene, expansible), 3903.19 (polystyrene, other), 3903.30 (acrylonitrile-butadiene-styrene (ABS) copolymers) or 3903.90 (other). National tariff lines under 3903.20 are live on border.bot for the United States (1 line, also used by 1 other country).

Source: https://border.bot/hs-codes/390320
Last updated: 11 October 2026

[HS codes](https://border.bot/hs-codes) / [Chapter 39](https://border.bot/hs-codes/39) / [39.03](https://border.bot/hs-codes/3903) / [3903.20](https://border.bot/hs-codes/390320)

## Key facts

- HS code: 3903.20
- Covers: Styrene-acrylonitrile (SAN) copolymers
- Heading: [39.03: Polymers of styrene, in primary forms](https://border.bot/hs-codes/3903)
- Chapter: [39: Plastics and articles thereof](https://border.bot/hs-codes/39)
- Edition: HS2022
- Duty in the United States: [See its 1 line](https://border.bot/countries/united-states/hs-codes/390320)

## What this code covers

HS code 3903.20 covers styrene-acrylonitrile (SAN) copolymers.

The legal text of the subheading is “Styrene-acrylonitrile (SAN) copolymers”, in HS2022.

## What it doesn’t cover

Other goods of heading 39.03 are classified under 3903.11 (polystyrene, expansible), 3903.19 (polystyrene, other), 3903.30 (acrylonitrile-butadiene-styrene (ABS) copolymers) or 3903.90 (other).

- [3903.11](https://border.bot/hs-codes/390311) Polystyrene: Expansible
- [3903.19](https://border.bot/hs-codes/390319) Polystyrene: Other
- [3903.30](https://border.bot/hs-codes/390330) Acrylonitrile-butadiene-styrene (ABS) copolymers
- [3903.90](https://border.bot/hs-codes/390390) Other

## How it is structured

3903.20 is a six-digit subheading. Its first two digits, 39, are the chapter; the first four, 3903, are heading 39.03; the last two, 20, identify the subheading within the heading.

Countries add their own digits after these six for their national tariff lines.

- Chapter 39: Plastics and articles thereof
- Heading 39.03: Polymers of styrene, in primary forms
- Subheading 3903.20: Styrene-acrylonitrile (SAN) copolymers

## In other countries

National tariff lines under 3903.20 are live on border.bot for the United States (1 line, also used by 1 other country).

- [United States](https://border.bot/countries/united-states/hs-codes/390320): 1 line, used by 1 other country

- Previous subheading: [3903.19](https://border.bot/hs-codes/390319) Polystyrene: Other
- Next subheading: [3903.30](https://border.bot/hs-codes/390330) Acrylonitrile-butadiene-styrene (ABS) copolymers

## Frequently asked questions

### What does HS code 3903.20 cover?

HS code 3903.20 covers styrene-acrylonitrile (SAN) copolymers.

### Which heading and chapter is HS code 3903.20 in?

HS code 3903.20 is in heading 39.03 (polymers of styrene, in primary forms) in chapter 39 (plastics and articles thereof).

### Where are goods of heading 39.03 classified when 3903.20 doesn’t fit?

Other goods of heading 39.03 are classified under 3903.11 (polystyrene, expansible), 3903.19 (polystyrene, other), 3903.30 (acrylonitrile-butadiene-styrene (ABS) copolymers) or 3903.90 (other).

### Which countries’ tariffs list national lines under HS code 3903.20?

National tariff lines under 3903.20 are live on border.bot for the United States (1 line, also used by 1 other country).

## Sources and updates

The Harmonized System legal text comes from border.bot release 2 (edition HS 2022), imported from a file, and has been live since 11 October 2026.

This page was last updated on 11 October 2026.

Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling.

Machine-readable: https://border.bot/hs-codes/390320.json