# United States tariff lines under HS 2519.90

> The United States tariff splits HS 2519.90 (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) into 3 national lines: 2519.90.10.00 (fused magnesia and dead-burned (sintered) magnesia), 2519.90.20.00 (caustic calcined magnesite) and 2519.90.50.00 (other). Every United States line under 2519.90 is free of general (MFN) duty.

Source: https://border.bot/countries/united-states/hs-codes/251990
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)

## Key facts

- HS subheading: [2519.90](https://border.bot/hs-codes/251990)
- Duty (MFN): Free
- National lines: 3
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 25: Salt; sulphur; earths and stone; plastering materials, lime and cement

## United States lines under 2519.90

The United States tariff splits HS 2519.90 (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) into 3 national lines: 2519.90.10.00 (fused magnesia and dead-burned (sintered) magnesia), 2519.90.20.00 (caustic calcined magnesite) and 2519.90.50.00 (other).

Every United States line under 2519.90 is free of general (MFN) duty.

- [2519.90.10.00](https://border.bot/countries/united-states/hs-codes/2519901000) Other, Fused magnesia and dead-burned (sintered) magnesia. Duty (MFN): free
- [2519.90.20.00](https://border.bot/countries/united-states/hs-codes/2519902000) Other, Caustic calcined magnesite. Duty (MFN): free
- [2519.90.50.00](https://border.bot/countries/united-states/hs-codes/2519905000) Other, Other. Duty (MFN): free

## 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)

- Previous subheading: [2519.10](https://border.bot/countries/united-states/hs-codes/251910) 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
- Next subheading: [2520.10](https://border.bot/countries/united-states/hs-codes/252010) Gypsum; anhydrite; plasters (consisting of calcined gypsum or calcium sulfate) whether or not colored, with or without small quantities of accelerators or retarders

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 2519.90?

The United States tariff splits HS 2519.90 (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) into 3 national lines: 2519.90.10.00 (fused magnesia and dead-burned (sintered) magnesia), 2519.90.20.00 (caustic calcined magnesite) and 2519.90.50.00 (other).

### What is the duty on HS 2519.90 in the United States?

Every United States line under 2519.90 is 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/251990.json