# United States tariff lines under HS 2931.90

> The United States tariff splits HS 2931.90 (other organo-inorganic compounds) into 16 national lines: 2931.90.05.00 (diphenyldichlorosilane; and phenyltrichlorosilane), 2931.90.10.00 (4,4'-Diphenylbisphosphonous acid, di(2',2",4',4"-di-tert-butyl)phenyl ester), 2931.90.15.00 (sodium tetraphenylboron), 2931.90.22.00 (drugs) and 12 others.

Source: https://border.bot/countries/united-states/hs-codes/293190
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 29](https://border.bot/countries/united-states/hs-codes/29) / [2931.90](https://border.bot/countries/united-states/hs-codes/293190)

## Key facts

- HS subheading: [2931.90](https://border.bot/hs-codes/293190)
- National lines: 16
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 29: Organic chemicals

## United States lines under 2931.90

The United States tariff splits HS 2931.90 (other organo-inorganic compounds) into 16 national lines: 2931.90.05.00 (diphenyldichlorosilane; and phenyltrichlorosilane), 2931.90.10.00 (4,4'-Diphenylbisphosphonous acid, di(2',2",4',4"-di-tert-butyl)phenyl ester), 2931.90.15.00 (sodium tetraphenylboron), 2931.90.22.00 (drugs) and 12 others.

- [2931.90.05.00](https://border.bot/countries/united-states/hs-codes/2931900500) Other, Aromatic, Diphenyldichlorosilane; and phenyltrichlorosilane. Duty (MFN): free
- [2931.90.10.00](https://border.bot/countries/united-states/hs-codes/2931901000) Other, Aromatic, 4,4'-Diphenylbisphosphonous acid, di(2',2",4',4"-di-tert-butyl)phenyl ester. Duty (MFN): 6.5%
- [2931.90.15.00](https://border.bot/countries/united-states/hs-codes/2931901500) Other, Aromatic, Sodium tetraphenylboron. Duty (MFN): 5.8%
- [2931.90.22.00](https://border.bot/countries/united-states/hs-codes/2931902200) Other, Aromatic, Other, Drugs. Duty (MFN): 6.5%
- [2931.90.26.00](https://border.bot/countries/united-states/hs-codes/2931902600) Other, Aromatic, Other, Pesticides. Duty (MFN): 6.5%
- [2931.90.30.00](https://border.bot/countries/united-states/hs-codes/2931903000) Other, Aromatic, Other, Other, Products described in additional U.S. note 3 to section VI. Duty (MFN): 6.5%
- [2931.90.60.00](https://border.bot/countries/united-states/hs-codes/2931906000) Other, Aromatic, Other, Other, Other. Duty (MFN): 6.5%
- [2931.90.70.00](https://border.bot/countries/united-states/hs-codes/2931907000) Other, Other, N,N'-Bis(trimethylsilyl) urea; 3-(Hydroxymethylphosphinyl)-1-propanoic acid, 2-hydroxyethyl ester; and 2-Phosphonobutane-1,2,4-tricarboxylic acid and its salts. Duty (MFN): free
- [2931.90.90.10](https://border.bot/countries/united-states/hs-codes/2931909010) Other, Other, Other, Organo-silicon compounds. Duty (MFN): 3.7%
- [2931.90.90.21](https://border.bot/countries/united-states/hs-codes/2931909021) Other, Other, Other, Organo-tin compounds, Dibutyltin oxide. Duty (MFN): 3.7%
- [2931.90.90.25](https://border.bot/countries/united-states/hs-codes/2931909025) Other, Other, Other, Organo-tin compounds, Tetrabutyltin. Duty (MFN): 3.7%
- [2931.90.90.29](https://border.bot/countries/united-states/hs-codes/2931909029) Other, Other, Other, Organo-tin compounds, Other. Duty (MFN): 3.7%
- [2931.90.90.30](https://border.bot/countries/united-states/hs-codes/2931909030) Other, Other, Other, 2-Chlorovinyldichloroarsine. Duty (MFN): 3.7%
- [2931.90.90.35](https://border.bot/countries/united-states/hs-codes/2931909035) Other, Other, Other, Bis(2-chlorovinyl)chloroarsine. Duty (MFN): 3.7%
- [2931.90.90.40](https://border.bot/countries/united-states/hs-codes/2931909040) Other, Other, Other, Tris(2-chlorovinyl)arsine. Duty (MFN): 3.7%
- [2931.90.90.52](https://border.bot/countries/united-states/hs-codes/2931909052) Other, Other, Other, Other. Duty (MFN): 3.7%

## In other countries

No other national tariff on border.bot has live lines under 2931.90 yet.

- [The Harmonized System text for 2931.90](https://border.bot/hs-codes/293190)

- Previous subheading: [2931.59](https://border.bot/countries/united-states/hs-codes/293159) Other organo-inorganic compounds
- Next subheading: [2932.11](https://border.bot/countries/united-states/hs-codes/293211) Heterocyclic compounds with oxygen hetero-atom(s) only

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 2931.90?

The United States tariff splits HS 2931.90 (other organo-inorganic compounds) into 16 national lines: 2931.90.05.00 (diphenyldichlorosilane; and phenyltrichlorosilane), 2931.90.10.00 (4,4'-Diphenylbisphosphonous acid, di(2',2",4',4"-di-tert-butyl)phenyl ester), 2931.90.15.00 (sodium tetraphenylboron), 2931.90.22.00 (drugs) and 12 others.

## 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/293190.json