# HS code 3903.11: Polystyrene, expansible

> HS code 3903.11 covers polystyrene, expansible. 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 3903.19 (polystyrene, other), 3903.20 (styrene-acrylonitrile (SAN) copolymers), 3903.30 (acrylonitrile-butadiene-styrene (ABS) copolymers) or 3903.90 (other).

Source: https://staging.border.bot/hs-codes/390311
Last updated: 13 October 2026

[HS codes](https://staging.border.bot/hs-codes) / [Chapter 39](https://staging.border.bot/hs-codes/39) / [39.03](https://staging.border.bot/hs-codes/3903) / [3903.11](https://staging.border.bot/hs-codes/390311)

## Key facts

- HS code: 3903.11
- Covers: Polystyrene, expansible
- Heading: [39.03: Polymers of styrene, in primary forms](https://staging.border.bot/hs-codes/3903)
- Chapter: [39: Plastics and articles thereof](https://staging.border.bot/hs-codes/39)
- Edition: HS2022
- Duty rates: [Set by each country’s tariff](https://staging.border.bot/countries)

## What this code covers

HS code 3903.11 covers polystyrene, expansible.

The legal text of the subheading is “Polystyrene: Expansible”, read under “Polystyrene”, in HS2022.

## What it doesn’t cover

Other goods of heading 39.03 are classified under 3903.19 (polystyrene, other), 3903.20 (styrene-acrylonitrile (SAN) copolymers), 3903.30 (acrylonitrile-butadiene-styrene (ABS) copolymers) or 3903.90 (other).

- [3903.19](https://staging.border.bot/hs-codes/390319) Polystyrene: Other
- [3903.20](https://staging.border.bot/hs-codes/390320) Styrene-acrylonitrile (SAN) copolymers
- [3903.30](https://staging.border.bot/hs-codes/390330) Acrylonitrile-butadiene-styrene (ABS) copolymers
- [3903.90](https://staging.border.bot/hs-codes/390390) Other

## How it is structured

3903.11 is a six-digit subheading. Its first two digits, 39, are the chapter; the first four, 3903, are heading 39.03; the last two, 11, 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
- Within the heading: Polystyrene
- Subheading 3903.11: Expansible

## In other countries

No national tariff lines under 3903.11 are live on border.bot yet. Tariffs built on the Harmonized System (HS2022) use 3903.11 at six digits and add their own digits after it.

- Previous subheading: [3902.90](https://staging.border.bot/hs-codes/390290) Other
- Next subheading: [3903.19](https://staging.border.bot/hs-codes/390319) Polystyrene: Other

## Frequently asked questions

### What does HS code 3903.11 cover?

HS code 3903.11 covers polystyrene, expansible.

### Which heading and chapter is HS code 3903.11 in?

HS code 3903.11 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 3903.11 doesn’t fit?

Other goods of heading 39.03 are classified under 3903.19 (polystyrene, other), 3903.20 (styrene-acrylonitrile (SAN) copolymers), 3903.30 (acrylonitrile-butadiene-styrene (ABS) copolymers) or 3903.90 (other).

## Sources and updates

The Harmonized System legal text comes from border.bot release 1 (edition HS 2022), imported from a file, and has been live since 13 October 2026.

This page was last updated on 13 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://staging.border.bot/hs-codes/390311.json