# United States tariff line 3907.99.20.00: Thermoplastic liquid crystal aromatic polyester copolymers

> In the United States tariff, line 3907.99.20.00 covers other polyesters, thermoplastic liquid crystal aromatic polyester copolymers. Goods under this line enter free of general (MFN) duty. It falls under HS subheading 3907.99 in heading 39.07 (chapter 39).

Source: https://border.bot/countries/united-states/hs-codes/3907992000
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) / [3907.99.20.00](https://border.bot/countries/united-states/hs-codes/3907992000)

## Key facts

- Tariff line: 3907.99.20.00
- Covers: Other polyesters, thermoplastic liquid crystal aromatic polyester copolymers
- Duty (MFN): Free
- Additional duties: None recorded
- Restrictions: None recorded
- Tariff: [United States](https://border.bot/countries/united-states)
- HS subheading: [3907.99](https://border.bot/hs-codes/390799)

## What this line covers

In the United States tariff, line 3907.99.20.00 covers other polyesters, thermoplastic liquid crystal aromatic polyester copolymers.

Its legal text is “Thermoplastic liquid crystal aromatic polyester copolymers”, read under “Other polyesters” and “Other”.

## How it is structured

It falls under HS subheading 3907.99 in heading 39.07 (chapter 39). The first six digits are the Harmonized System code; the 4 digits after them are added by the United States tariff.

- Chapter 39: Plastics and articles thereof
- Heading 39.07: Polyacetals, other polyethers and epoxide resins, in primary forms; polycarbonates, alkyd resins, polyallyl esters and other polyesters, in primary forms
- Subheading 3907.99: Other polyesters
- Within the subheading: Other
- Line 3907.99.20.00: Thermoplastic liquid crystal aromatic polyester copolymers

## 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 3907.99 yet.

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

## Other lines under 3907.99

- [3907.99.50.10](https://border.bot/countries/united-states/hs-codes/3907995010) Polybutylene terephthalate
- [3907.99.50.50](https://border.bot/countries/united-states/hs-codes/3907995050) Other

- Previous line: [3907.91.50.00](https://border.bot/countries/united-states/hs-codes/3907915000) Other
- Next line: [3907.99.50.10](https://border.bot/countries/united-states/hs-codes/3907995010) Polybutylene terephthalate

## Frequently asked questions

### What does tariff line 3907.99.20.00 cover in the United States tariff?

In the United States tariff, line 3907.99.20.00 covers other polyesters, thermoplastic liquid crystal aromatic polyester copolymers.

### What is the general (MFN) duty on 3907.99.20.00 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/3907992000.json