# United States tariff lines under HS 3810.90

> The United States tariff splits HS 3810.90 (pickling preparations for metal surfaces; fluxes and other auxiliary preparations for soldering, brazing or welding; soldering, brazing or welding powders and pastes consisting of metal and other materials; preparations of a kind used as cores or coatings for welding electrodes or rods) into 3 national lines: 3810.90.10.00 (containing 5 percent or more by weight of one or more aromatic or modified aromatic substances), 3810.90.20.00 (consisting wholly of inorganic substances) and 3810.90.50.00 (other). The general (MFN) duty differs by line: 6.5% on 3810.90.10.00, free on 3810.90.20.00 and 5% on 3810.90.50.00.

Source: https://border.bot/countries/united-states/hs-codes/381090
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 38](https://border.bot/countries/united-states/hs-codes/38) / [3810.90](https://border.bot/countries/united-states/hs-codes/381090)

## Key facts

- HS subheading: [3810.90](https://border.bot/hs-codes/381090)
- National lines: 3
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 38: Miscellaneous chemical products

## United States lines under 3810.90

The United States tariff splits HS 3810.90 (pickling preparations for metal surfaces; fluxes and other auxiliary preparations for soldering, brazing or welding; soldering, brazing or welding powders and pastes consisting of metal and other materials; preparations of a kind used as cores or coatings for welding electrodes or rods) into 3 national lines: 3810.90.10.00 (containing 5 percent or more by weight of one or more aromatic or modified aromatic substances), 3810.90.20.00 (consisting wholly of inorganic substances) and 3810.90.50.00 (other).

The general (MFN) duty differs by line: 6.5% on 3810.90.10.00, free on 3810.90.20.00 and 5% on 3810.90.50.00.

- [3810.90.10.00](https://border.bot/countries/united-states/hs-codes/3810901000) Other, Containing 5 percent or more by weight of one or more aromatic or modified aromatic substances. Duty (MFN): 6.5%
- [3810.90.20.00](https://border.bot/countries/united-states/hs-codes/3810902000) Other, Consisting wholly of inorganic substances. Duty (MFN): free
- [3810.90.50.00](https://border.bot/countries/united-states/hs-codes/3810905000) Other, Other. Duty (MFN): 5%

## In other countries

No other national tariff on border.bot has live lines under 3810.90 yet.

- [The Harmonized System text for 3810.90](https://border.bot/hs-codes/381090)

- Previous subheading: [3810.10](https://border.bot/countries/united-states/hs-codes/381010) Pickling preparations for metal surfaces; fluxes and other auxiliary preparations for soldering, brazing or welding; soldering, brazing or welding powders and pastes consisting of metal and other materials; preparations of a kind used as cores or coatings for welding electrodes or rods
- Next subheading: [3811.11](https://border.bot/countries/united-states/hs-codes/381111) Based on lead compounds

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 3810.90?

The United States tariff splits HS 3810.90 (pickling preparations for metal surfaces; fluxes and other auxiliary preparations for soldering, brazing or welding; soldering, brazing or welding powders and pastes consisting of metal and other materials; preparations of a kind used as cores or coatings for welding electrodes or rods) into 3 national lines: 3810.90.10.00 (containing 5 percent or more by weight of one or more aromatic or modified aromatic substances), 3810.90.20.00 (consisting wholly of inorganic substances) and 3810.90.50.00 (other).

### What is the duty on HS 3810.90 in the United States?

The general (MFN) duty differs by line: 6.5% on 3810.90.10.00, free on 3810.90.20.00 and 5% on 3810.90.50.00.

## 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/381090.json