# United States tariff line 2519.90.20.00: Caustic calcined magnesite

> In the United States tariff, line 2519.90.20.00 covers caustic calcined magnesite. Goods under this line enter free of general (MFN) duty. It falls under HS subheading 2519.90 in heading 25.19 (chapter 25).

Source: https://border.bot/countries/united-states/hs-codes/2519902000
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) / [2519.90](https://border.bot/countries/united-states/hs-codes/251990) / [2519.90.20.00](https://border.bot/countries/united-states/hs-codes/2519902000)

## Key facts

- Tariff line: 2519.90.20.00
- Covers: Caustic calcined magnesite
- Duty (MFN): Free
- Additional duties: None recorded
- Restrictions: None recorded
- Tariff: [United States](https://border.bot/countries/united-states)
- HS subheading: [2519.90](https://border.bot/hs-codes/251990)

## What this line covers

In the United States tariff, line 2519.90.20.00 covers caustic calcined magnesite.

Its legal text is “Caustic calcined magnesite”, read under “Other”.

## How it is structured

It falls under HS subheading 2519.90 in heading 25.19 (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 25.19: Natural magnesium carbonate (magnesite); fused magnesia; dead-burned (sintered) magnesia, whether or not containing small quantities of other oxides added before sintering; other magnesium oxide, whether or not pure
- Subheading 2519.90: Other
- Line 2519.90.20.00: Caustic calcined magnesite

## 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 2519.90 yet.

- [The Harmonized System text for 2519.90](https://border.bot/hs-codes/251990)

## Other lines under 2519.90

- [2519.90.10.00](https://border.bot/countries/united-states/hs-codes/2519901000) Fused magnesia and dead-burned (sintered) magnesia
- [2519.90.50.00](https://border.bot/countries/united-states/hs-codes/2519905000) Other

- Previous line: [2519.90.10.00](https://border.bot/countries/united-states/hs-codes/2519901000) Fused magnesia and dead-burned (sintered) magnesia
- Next line: [2519.90.50.00](https://border.bot/countries/united-states/hs-codes/2519905000) Other

## Frequently asked questions

### What does tariff line 2519.90.20.00 cover in the United States tariff?

In the United States tariff, line 2519.90.20.00 covers caustic calcined magnesite.

### What is the general (MFN) duty on 2519.90.20.00 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/2519902000.json