# United States tariff lines under HS 3907.99

> The United States tariff splits HS 3907.99 (other polyesters: Other) into 3 national lines: 3907.99.20.00 (thermoplastic liquid crystal aromatic polyester copolymers), 3907.99.50.10 (polybutylene terephthalate) and 3907.99.50.50 (other). The general (MFN) duty differs by line: free on 3907.99.20.00, 6.5% on 3907.99.50.10 and 6.5% on 3907.99.50.50.

Source: https://border.bot/countries/united-states/hs-codes/390799
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) / [3907.99](https://border.bot/countries/united-states/hs-codes/390799)

## Key facts

- HS subheading: [3907.99](https://border.bot/hs-codes/390799)
- National lines: 3
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 39: Plastics and articles thereof

## United States lines under 3907.99

The United States tariff splits HS 3907.99 (other polyesters: Other) into 3 national lines: 3907.99.20.00 (thermoplastic liquid crystal aromatic polyester copolymers), 3907.99.50.10 (polybutylene terephthalate) and 3907.99.50.50 (other).

The general (MFN) duty differs by line: free on 3907.99.20.00, 6.5% on 3907.99.50.10 and 6.5% on 3907.99.50.50.

- [3907.99.20.00](https://border.bot/countries/united-states/hs-codes/3907992000) Other polyesters, Other, Thermoplastic liquid crystal aromatic polyester copolymers. Duty (MFN): free
- [3907.99.50.10](https://border.bot/countries/united-states/hs-codes/3907995010) Other polyesters, Other, Other, Polybutylene terephthalate. Duty (MFN): 6.5%
- [3907.99.50.50](https://border.bot/countries/united-states/hs-codes/3907995050) Other polyesters, Other, Other, Other. Duty (MFN): 6.5%

## In other countries

No other national tariff on border.bot has live lines under 3907.99 yet.

- [The Harmonized System text for 3907.99](https://border.bot/hs-codes/390799)

- Previous subheading: [3907.91](https://border.bot/countries/united-states/hs-codes/390791) Unsaturated
- Next subheading: [3908.10](https://border.bot/countries/united-states/hs-codes/390810) Polyamides in primary forms

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 3907.99?

The United States tariff splits HS 3907.99 (other polyesters: Other) into 3 national lines: 3907.99.20.00 (thermoplastic liquid crystal aromatic polyester copolymers), 3907.99.50.10 (polybutylene terephthalate) and 3907.99.50.50 (other).

### What is the duty on HS 3907.99 in the United States?

The general (MFN) duty differs by line: free on 3907.99.20.00, 6.5% on 3907.99.50.10 and 6.5% on 3907.99.50.50.

## 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/390799.json