# HS code 3908.90: Polyamides in primary forms

> HS code 3908.90 covers polyamides in primary forms, other than those classified in 3908.10. It sits in heading 39.08 (polyamides in primary forms) in chapter 39 (plastics and articles thereof). Other goods of heading 39.08 are classified under 3908.10 (polyamide-6, -11, -12, -6,6, -6,9, -6,10 or -6,12).

Source: https://staging.border.bot/hs-codes/390890
Last updated: 13 October 2026

[HS codes](https://staging.border.bot/hs-codes) / [Chapter 39](https://staging.border.bot/hs-codes/39) / [39.08](https://staging.border.bot/hs-codes/3908) / [3908.90](https://staging.border.bot/hs-codes/390890)

## Key facts

- HS code: 3908.90
- Covers: Polyamides in primary forms
- Heading: [39.08: Polyamides in primary forms](https://staging.border.bot/hs-codes/3908)
- Chapter: [39: Plastics and articles thereof](https://staging.border.bot/hs-codes/39)
- Edition: HS2022
- Duty rates: [Set by each country’s tariff](https://staging.border.bot/countries)

## What this code covers

HS code 3908.90 covers polyamides in primary forms, other than those classified in 3908.10.

The legal text of the subheading is “Other”, in HS2022.

## What it doesn’t cover

Other goods of heading 39.08 are classified under 3908.10 (polyamide-6, -11, -12, -6,6, -6,9, -6,10 or -6,12).

- [3908.10](https://staging.border.bot/hs-codes/390810) Polyamide-6, -11, -12, -6,6, -6,9, -6,10 or -6,12

## How it is structured

3908.90 is a six-digit subheading. Its first two digits, 39, are the chapter; the first four, 3908, are heading 39.08; the last two, 90, identify the subheading within the heading.

Countries add their own digits after these six for their national tariff lines.

- Chapter 39: Plastics and articles thereof
- Heading 39.08: Polyamides in primary forms
- Subheading 3908.90: Other

## In other countries

No national tariff lines under 3908.90 are live on border.bot yet. Tariffs built on the Harmonized System (HS2022) use 3908.90 at six digits and add their own digits after it.

- Previous subheading: [3908.10](https://staging.border.bot/hs-codes/390810) Polyamide-6, -11, -12, -6,6, -6,9, -6,10 or -6,12
- Next subheading: [3909.10](https://staging.border.bot/hs-codes/390910) Urea resins; thiourea resins

## Frequently asked questions

### What does HS code 3908.90 cover?

HS code 3908.90 covers polyamides in primary forms, other than those classified in 3908.10.

### Which heading and chapter is HS code 3908.90 in?

HS code 3908.90 is in heading 39.08 (polyamides in primary forms) in chapter 39 (plastics and articles thereof).

### Where are goods of heading 39.08 classified when 3908.90 doesn’t fit?

Other goods of heading 39.08 are classified under 3908.10 (polyamide-6, -11, -12, -6,6, -6,9, -6,10 or -6,12).

## Sources and updates

The Harmonized System legal text comes from border.bot release 1 (edition HS 2022), imported from a file, and has been live since 13 October 2026.

This page was last updated on 13 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.

Machine-readable: https://staging.border.bot/hs-codes/390890.json