# United States tariff line 3808.99.30.00: Formulated biocides based on 2-methyl-4-isothiazolin-3-one, or 2-n-octyl-4-isothiazolin-3-one, or 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one, or mixtures of 5-chloro-2-methyl-4- isothiazolin-3-one and 2-methyl-4- isothiazolin-3-one; and Metaldehyde

> In the United States tariff, line 3808.99.30.00 covers formulated biocides based on 2-methyl-4-isothiazolin-3-one, or 2-n-octyl-4-isothiazolin-3-one, or 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one, or mixtures of 5-chloro-2-methyl-4- isothiazolin-3-one and 2-methyl-4- isothiazolin-3-one; and Metaldehyde. Goods under this line enter free of general (MFN) duty. It falls under HS subheading 3808.99 in heading 38.08 (chapter 38).

Source: https://border.bot/countries/united-states/hs-codes/3808993000
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) / [3808.99](https://border.bot/countries/united-states/hs-codes/380899) / [3808.99.30.00](https://border.bot/countries/united-states/hs-codes/3808993000)

## Key facts

- Tariff line: 3808.99.30.00
- Covers: Formulated biocides based on 2-methyl-4-isothiazolin-3-one, or 2-n-octyl-4-isothiazolin-3-one, or 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one, or mixtures of 5-chloro-2-methyl-4- isothiazolin-3-one and 2-methyl-4- isothiazolin-3-one; and Metaldehyde
- Duty (MFN): Free
- Additional duties: None recorded
- Restrictions: None recorded
- Tariff: [United States](https://border.bot/countries/united-states)
- HS subheading: [3808.99](https://border.bot/hs-codes/380899)

## What this line covers

In the United States tariff, line 3808.99.30.00 covers formulated biocides based on 2-methyl-4-isothiazolin-3-one, or 2-n-octyl-4-isothiazolin-3-one, or 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one, or mixtures of 5-chloro-2-methyl-4- isothiazolin-3-one and 2-methyl-4- isothiazolin-3-one; and Metaldehyde.

Its legal text is “Formulated biocides based on 2-methyl-4-isothiazolin-3-one, or 2-n-octyl-4-isothiazolin-3-one, or 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one, or mixtures of 5-chloro-2-methyl-4- isothiazolin-3-one and 2-methyl-4- isothiazolin-3-one; and Metaldehyde”, read under “Other”, “Other” and “Other”.

## How it is structured

It falls under HS subheading 3808.99 in heading 38.08 (chapter 38). The first six digits are the Harmonized System code; the 4 digits after them are added by the United States tariff.

- Chapter 38: Miscellaneous chemical products
- Heading 38.08: Insecticides, rodenticides, fungicides, herbicides, antisprouting products and plant-growth regulators, disinfectants and similar products, put up in forms or packings for retail sale or as preparations or articles (for example, sulfur-treated bands, wicks and candles, and flypapers)
- Subheading 3808.99: Other
- Within the subheading: Other
- Within the subheading: Other
- Line 3808.99.30.00: Formulated biocides based on 2-methyl-4-isothiazolin-3-one, or 2-n-octyl-4-isothiazolin-3-one, or 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one, or mixtures of 5-chloro-2-methyl-4- isothiazolin-3-one and 2-methyl-4- isothiazolin-3-one; and Metaldehyde

## Duty

Goods under this line enter free of general (MFN) duty.

## In other countries

No other national tariff on border.bot has live lines under 3808.99 yet.

- [The Harmonized System text for 3808.99](https://border.bot/hs-codes/380899)

## Other lines under 3808.99

- [3808.99.04.00](https://border.bot/countries/united-states/hs-codes/3808990400) Mixtures of 1,1-bis(4-chlorophenyl)-2,2,2- trichloroethanol (Dicofol) and application adjuvants
- [3808.99.08.00](https://border.bot/countries/united-states/hs-codes/3808990800) Other
- [3808.99.70.00](https://border.bot/countries/united-states/hs-codes/3808997000) Containing an inorganic substance
- [3808.99.95.01](https://border.bot/countries/united-states/hs-codes/3808999501) Other

- Previous line: [3808.99.08.00](https://border.bot/countries/united-states/hs-codes/3808990800) Other
- Next line: [3808.99.70.00](https://border.bot/countries/united-states/hs-codes/3808997000) Containing an inorganic substance

## Frequently asked questions

### What does tariff line 3808.99.30.00 cover in the United States tariff?

In the United States tariff, line 3808.99.30.00 covers formulated biocides based on 2-methyl-4-isothiazolin-3-one, or 2-n-octyl-4-isothiazolin-3-one, or 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one, or mixtures of 5-chloro-2-methyl-4- isothiazolin-3-one and 2-methyl-4- isothiazolin-3-one; and Metaldehyde.

### What is the general (MFN) duty on 3808.99.30.00 in the United States?

Goods under this line enter free of general (MFN) duty.

## 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/3808993000.json