# United States tariff line 4002.39.00.00: Other

> In the United States tariff, line 4002.39.00.00 covers isobutene-isoprene (butyl) rubber (IIR); halo-isobutene-isoprene rubber (CIIR or BIIR). Goods under this line enter free of general (MFN) duty. It falls under HS subheading 4002.39 in heading 40.02 (chapter 40).

Source: https://border.bot/countries/united-states/hs-codes/4002390000
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 40](https://border.bot/countries/united-states/hs-codes/40) / [4002.39](https://border.bot/countries/united-states/hs-codes/400239) / [4002.39.00.00](https://border.bot/countries/united-states/hs-codes/4002390000)

## Key facts

- Tariff line: 4002.39.00.00
- Covers: Isobutene-isoprene (butyl) rubber (IIR); halo-isobutene-isoprene rubber (CIIR or BIIR)
- Duty (MFN): Free
- Additional duties: None recorded
- Restrictions: None recorded
- Tariff: [United States](https://border.bot/countries/united-states)
- HS subheading: [4002.39](https://border.bot/hs-codes/400239)

## What this line covers

In the United States tariff, line 4002.39.00.00 covers isobutene-isoprene (butyl) rubber (IIR); halo-isobutene-isoprene rubber (CIIR or BIIR).

Its legal text is “Other”, read under “Isobutene-isoprene (butyl) rubber (IIR); halo-isobutene-isoprene rubber (CIIR or BIIR)”.

## How it is structured

It falls under HS subheading 4002.39 in heading 40.02 (chapter 40). The first six digits are the Harmonized System code; the 4 digits after them are added by the United States tariff.

- Chapter 40: Rubber and articles thereof
- Heading 40.02: Synthetic rubber and factice derived from oils, in primary forms or in plates, sheets or strip; mixtures of any product of heading 4001 with any product of this heading, in primary forms or in plates, sheets or strip
- Subheading 4002.39: Isobutene-isoprene (butyl) rubber (IIR); halo-isobutene-isoprene rubber (CIIR or BIIR)
- Line 4002.39.00.00: Other

## Duty

Goods under this line enter free of general (MFN) duty.

## In other countries

No other national tariff on border.bot has live lines under 4002.39 yet.

- [The Harmonized System text for 4002.39](https://border.bot/hs-codes/400239)

- Previous line: [4002.31.00.00](https://border.bot/countries/united-states/hs-codes/4002310000) Isobutene-isoprene (butyl) rubber (IIR)
- Next line: [4002.41.00.00](https://border.bot/countries/united-states/hs-codes/4002410000) Latex

## Frequently asked questions

### What does tariff line 4002.39.00.00 cover in the United States tariff?

In the United States tariff, line 4002.39.00.00 covers isobutene-isoprene (butyl) rubber (IIR); halo-isobutene-isoprene rubber (CIIR or BIIR).

### What is the general (MFN) duty on 4002.39.00.00 in the United States?

Goods under this line enter free of general (MFN) duty.

## 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/4002390000.json