# United States tariff lines under HS 3907.91

> The United States tariff splits HS 3907.91 (other polyesters: Unsaturated) into 3 national lines: 3907.91.20.00 (allyl resins, uncompounded), 3907.91.40.00 (other) and 3907.91.50.00 (other). The general (MFN) duty differs by line: free on 3907.91.20.00, 5.8% on 3907.91.40.00 and 6.5% on 3907.91.50.00.

Source: https://border.bot/countries/united-states/hs-codes/390791
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) / [3907.91](https://border.bot/countries/united-states/hs-codes/390791)

## Key facts

- HS subheading: [3907.91](https://border.bot/hs-codes/390791)
- National lines: 3
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 39: Plastics and articles thereof

## United States lines under 3907.91

The United States tariff splits HS 3907.91 (other polyesters: Unsaturated) into 3 national lines: 3907.91.20.00 (allyl resins, uncompounded), 3907.91.40.00 (other) and 3907.91.50.00 (other).

The general (MFN) duty differs by line: free on 3907.91.20.00, 5.8% on 3907.91.40.00 and 6.5% on 3907.91.50.00.

- [3907.91.20.00](https://border.bot/countries/united-states/hs-codes/3907912000) Other polyesters, Unsaturated, Allyl resins, Allyl resins, uncompounded. Duty (MFN): free
- [3907.91.40.00](https://border.bot/countries/united-states/hs-codes/3907914000) Other polyesters, Unsaturated, Allyl resins, Other. Duty (MFN): 5.8%
- [3907.91.50.00](https://border.bot/countries/united-states/hs-codes/3907915000) Other polyesters, Unsaturated, Other. Duty (MFN): 6.5%

## In other countries

No other national tariff on border.bot has live lines under 3907.91 yet.

- [The Harmonized System text for 3907.91](https://border.bot/hs-codes/390791)

- Previous subheading: [3907.70](https://border.bot/countries/united-states/hs-codes/390770) Polyacetals, other polyethers and epoxide resins, in primary forms; polycarbonates, alkyd resins, polyallyl esters and other polyesters, in primary forms
- Next subheading: [3907.99](https://border.bot/countries/united-states/hs-codes/390799) Other

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 3907.91?

The United States tariff splits HS 3907.91 (other polyesters: Unsaturated) into 3 national lines: 3907.91.20.00 (allyl resins, uncompounded), 3907.91.40.00 (other) and 3907.91.50.00 (other).

### What is the duty on HS 3907.91 in the United States?

The general (MFN) duty differs by line: free on 3907.91.20.00, 5.8% on 3907.91.40.00 and 6.5% on 3907.91.50.00.

## 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/390791.json