# HS code 3911.20: Poly(1,3-phenylene methylphosphonate)

> HS code 3911.20 covers poly(1,3-phenylene methylphosphonate). It sits in heading 39.11 (petroleum resins, coumarone-indene resins, polyterpenes, polysulphides, polysulphones and other products specified in note 3 to this chapter, not elsewhere specified or included, in primary forms) in chapter 39 (plastics and articles thereof). Other goods of heading 39.11 are classified under 3911.10 (petroleum resins, coumarone, indene or coumarone-indene resins or polyterpenes) and 3911.90 (other). National tariff lines under 3911.20 are live on border.bot for the United States (1 line, also used by 1 other country).

Source: https://border.bot/hs-codes/391120
Last updated: 11 October 2026

[HS codes](https://border.bot/hs-codes) / [Chapter 39](https://border.bot/hs-codes/39) / [39.11](https://border.bot/hs-codes/3911) / [3911.20](https://border.bot/hs-codes/391120)

## Key facts

- HS code: 3911.20
- Covers: Poly(1,3-phenylene methylphosphonate)
- Heading: [39.11: Petroleum resins, coumarone-indene resins, polyterpenes, polysulphides, polysulphones and other products specified in note 3 to this chapter, not elsewhere specified or included, in primary forms](https://border.bot/hs-codes/3911)
- 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/391120)

## What this code covers

HS code 3911.20 covers poly(1,3-phenylene methylphosphonate).

The legal text of the subheading is “Poly(1,3-phenylene methylphosphonate)”, in HS2022.

## What it doesn’t cover

Other goods of heading 39.11 are classified under 3911.10 (petroleum resins, coumarone, indene or coumarone-indene resins or polyterpenes) and 3911.90 (other).

- [3911.10](https://border.bot/hs-codes/391110) Petroleum resins, coumarone, indene or coumarone-indene resins and polyterpenes
- [3911.90](https://border.bot/hs-codes/391190) Other

## How it is structured

3911.20 is a six-digit subheading. Its first two digits, 39, are the chapter; the first four, 3911, are heading 39.11; 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 39.11: Petroleum resins, coumarone-indene resins, polyterpenes, polysulphides, polysulphones and other products specified in note 3 to this chapter, not elsewhere specified or included, in primary forms
- Subheading 3911.20: Poly(1,3-phenylene methylphosphonate)

## In other countries

National tariff lines under 3911.20 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/391120): 1 line, used by 1 other country

- Previous subheading: [3911.10](https://border.bot/hs-codes/391110) Petroleum resins, coumarone, indene or coumarone-indene resins and polyterpenes
- Next subheading: [3911.90](https://border.bot/hs-codes/391190) Other

## Frequently asked questions

### What does HS code 3911.20 cover?

HS code 3911.20 covers poly(1,3-phenylene methylphosphonate).

### Which heading and chapter is HS code 3911.20 in?

HS code 3911.20 is in heading 39.11 (petroleum resins, coumarone-indene resins, polyterpenes, polysulphides, polysulphones and other products specified in note 3 to this chapter, not elsewhere specified or included, in primary forms) in chapter 39 (plastics and articles thereof).

### Where are goods of heading 39.11 classified when 3911.20 doesn’t fit?

Other goods of heading 39.11 are classified under 3911.10 (petroleum resins, coumarone, indene or coumarone-indene resins or polyterpenes) and 3911.90 (other).

### Which countries’ tariffs list national lines under HS code 3911.20?

National tariff lines under 3911.20 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/391120.json