# United States tariff lines under HS 3902.20

> The United States tariff splits HS 3902.20 (polyisobutylene) into 2 national lines: 3902.20.10.00 (elastomeric) and 3902.20.50.00 (other). The general (MFN) duty differs by line: free on 3902.20.10.00 and 6.5% on 3902.20.50.00.

Source: https://border.bot/countries/united-states/hs-codes/390220
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 39](https://border.bot/countries/united-states/hs-codes/39) / [3902.20](https://border.bot/countries/united-states/hs-codes/390220)

## Key facts

- HS subheading: [3902.20](https://border.bot/hs-codes/390220)
- National lines: 2
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 39: Plastics and articles thereof

## United States lines under 3902.20

The United States tariff splits HS 3902.20 (polyisobutylene) into 2 national lines: 3902.20.10.00 (elastomeric) and 3902.20.50.00 (other).

The general (MFN) duty differs by line: free on 3902.20.10.00 and 6.5% on 3902.20.50.00.

- [3902.20.10.00](https://border.bot/countries/united-states/hs-codes/3902201000) Polyisobutylene, Elastomeric. Duty (MFN): free
- [3902.20.50.00](https://border.bot/countries/united-states/hs-codes/3902205000) Polyisobutylene, Other. Duty (MFN): 6.5%

## In other countries

No other national tariff on border.bot has live lines under 3902.20 yet.

- [The Harmonized System text for 3902.20](https://border.bot/hs-codes/390220)

- Previous subheading: [3902.10](https://border.bot/countries/united-states/hs-codes/390210) Polymers of propylene or of other olefins, in primary forms
- Next subheading: [3902.30](https://border.bot/countries/united-states/hs-codes/390230) Polymers of propylene or of other olefins, in primary forms

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 3902.20?

The United States tariff splits HS 3902.20 (polyisobutylene) into 2 national lines: 3902.20.10.00 (elastomeric) and 3902.20.50.00 (other).

### What is the duty on HS 3902.20 in the United States?

The general (MFN) duty differs by line: free on 3902.20.10.00 and 6.5% on 3902.20.50.00.

## Sources and updates

The tariff lines for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The duty rates for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The trade programmes for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

This page was last updated on 9 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.

Official source files:

- https://hts.usitc.gov/reststop/exportList?from=0000000000&to=9999999999&format=CSV&styles=false

Machine-readable: https://border.bot/countries/united-states/hs-codes/390220.json