# United States tariff line 2512.00.00.00: Siliceous fossil meals (for example, kieselguhr, tripolite and diatomite) and similar siliceous earths, whether or not calcined, of an apparent specific gravity of 1 or less

> In the United States tariff, line 2512.00.00.00 covers siliceous fossil meals (for example, kieselguhr, tripolite and diatomite) and similar siliceous earths, whether or not calcined, of an apparent specific gravity of 1 or less. Goods under this line enter free of general (MFN) duty. It falls under HS subheading 2512.00 in heading 25.12 (chapter 25).

Source: https://border.bot/countries/united-states/hs-codes/2512000000
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 25](https://border.bot/countries/united-states/hs-codes/25) / [2512.00](https://border.bot/countries/united-states/hs-codes/251200) / [2512.00.00.00](https://border.bot/countries/united-states/hs-codes/2512000000)

## Key facts

- Tariff line: 2512.00.00.00
- Covers: Siliceous fossil meals (for example, kieselguhr, tripolite and diatomite) and similar siliceous earths, whether or not calcined, of an apparent specific gravity of 1 or less
- Duty (MFN): Free
- Additional duties: None recorded
- Restrictions: None recorded
- Tariff: [United States](https://border.bot/countries/united-states)
- HS subheading: [2512.00](https://border.bot/hs-codes/251200)

## What this line covers

In the United States tariff, line 2512.00.00.00 covers siliceous fossil meals (for example, kieselguhr, tripolite and diatomite) and similar siliceous earths, whether or not calcined, of an apparent specific gravity of 1 or less.

Its legal text is “Siliceous fossil meals (for example, kieselguhr, tripolite and diatomite) and similar siliceous earths, whether or not calcined, of an apparent specific gravity of 1 or less”.

## How it is structured

It falls under HS subheading 2512.00 in heading 25.12 (chapter 25). The first six digits are the Harmonized System code; the 4 digits after them are added by the United States tariff.

- Chapter 25: Salt; sulphur; earths and stone; plastering materials, lime and cement
- Heading 25.12: Siliceous fossil meals (for example, kieselguhr, tripolite and diatomite) and similar siliceous earths, whether or not calcined, of an apparent specific gravity of 1 or less

## 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 2512.00 yet.

- [The Harmonized System text for 2512.00](https://border.bot/hs-codes/251200)

- Previous line: [2511.20.00.00](https://border.bot/countries/united-states/hs-codes/2511200000) Natural barium carbonate (witherite)
- Next line: [2513.10.00.10](https://border.bot/countries/united-states/hs-codes/2513100010) Crude or in irregular pieces, including crushed pumice

## Frequently asked questions

### What does tariff line 2512.00.00.00 cover in the United States tariff?

In the United States tariff, line 2512.00.00.00 covers siliceous fossil meals (for example, kieselguhr, tripolite and diatomite) and similar siliceous earths, whether or not calcined, of an apparent specific gravity of 1 or less.

### What is the general (MFN) duty on 2512.00.00.00 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/2512000000.json