# United States tariff lines under HS 3908.90

> The United States tariff splits HS 3908.90 (polyamides in primary forms) into 2 national lines: 3908.90.20.00 (bis(4-amino-3-methylcyclohexyl)methane- isophthalic acid-laurolactam copolymer) and 3908.90.70.00 (other). The general (MFN) duty differs by line: free on 3908.90.20.00 and 6.5% on 3908.90.70.00.

Source: https://border.bot/countries/united-states/hs-codes/390890
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) / [3908.90](https://border.bot/countries/united-states/hs-codes/390890)

## Key facts

- HS subheading: [3908.90](https://border.bot/hs-codes/390890)
- National lines: 2
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 39: Plastics and articles thereof

## United States lines under 3908.90

The United States tariff splits HS 3908.90 (polyamides in primary forms) into 2 national lines: 3908.90.20.00 (bis(4-amino-3-methylcyclohexyl)methane- isophthalic acid-laurolactam copolymer) and 3908.90.70.00 (other).

The general (MFN) duty differs by line: free on 3908.90.20.00 and 6.5% on 3908.90.70.00.

- [3908.90.20.00](https://border.bot/countries/united-states/hs-codes/3908902000) Other, Bis(4-amino-3-methylcyclohexyl)methane- isophthalic acid-laurolactam copolymer. Duty (MFN): free
- [3908.90.70.00](https://border.bot/countries/united-states/hs-codes/3908907000) Other, Other. Duty (MFN): 6.5%

## In other countries

No other national tariff on border.bot has live lines under 3908.90 yet.

- [The Harmonized System text for 3908.90](https://border.bot/hs-codes/390890)

- Previous subheading: [3908.10](https://border.bot/countries/united-states/hs-codes/390810) Polyamides in primary forms
- Next subheading: [3909.10](https://border.bot/countries/united-states/hs-codes/390910) Amino-resins, phenolic resins and polyurethanes, in primary forms

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 3908.90?

The United States tariff splits HS 3908.90 (polyamides in primary forms) into 2 national lines: 3908.90.20.00 (bis(4-amino-3-methylcyclohexyl)methane- isophthalic acid-laurolactam copolymer) and 3908.90.70.00 (other).

### What is the duty on HS 3908.90 in the United States?

The general (MFN) duty differs by line: free on 3908.90.20.00 and 6.5% on 3908.90.70.00.

## 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/390890.json