HTS heading 2519 · Chapter 25

HTS 2519: Natural magnesium carbonate

HTS heading 2519 covers 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. It has 4 tariff lines with a duty rate; the general (MFN) rates are Free (4 lines).

Imports may also owe Chapter 99 tariffs (Section 232, 301 or 201) depending on origin and date, plus the Merchandise Processing Fee and, by sea, the Harbor Maintenance Fee.

Rates from the 2026 HTS Revision 22, effective October 30, 2026. Source: U.S. International Trade Commission.

HTS code

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Country of origin

Customs value (USD)

Mode of transport

Entry date

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Tariff lines and duty rates

HTS code	Description	General	Column 2	Estimate
2519.10.00.00	Natural magnesium carbonate (magnesite)[t]	Free	$10.33/t	Estimate →
2519.90	Other:
2519.90.10.00	Fused magnesia and dead-burned (sintered) magnesia[kg]	Free	1.7¢/kg	Estimate →
2519.90.20.00	Caustic calcined magnesite[t]	Free	$20.70/t	Estimate →
2519.90.50.00	Other[kg]	Free	15.4¢/kg	Estimate →

4 lines shown. Statistical suffixes (the last two digits) inherit the rate of the 8-digit subheading above them.

Example: base duty and fees on $10000

For HTS 2519.10.00.00 at the general rate of Free, shipped by ocean, before any Chapter 99 tariffs:

Base duty (Free)	$0.00
Merchandise Processing Fee (0.3464%, min $34.58)	$34.64
Harbor Maintenance Fee (0.125%)	$12.50
Duty and fees	$47.14

Origin-specific tariffs can multiply this. Run this example from China or from Mexico to see every line.

Frequently asked questions

What is the duty rate for HTS 2519?

Heading 2519 has 4 rate lines. The general (MFN) duty rates are Free (4 lines). Products of free trade agreement partners may enter at the special rate, and Column 2 rates apply to countries without normal trade relations. Chapter 99 tariffs can be added on top: calculate the full amount.

Do Section 301, 232 or 201 tariffs apply to HTS 2519?

It depends on the 8- or 10-digit subheading, the country of origin, the entry date and, for Section 232, the metal content. These additional duties are listed in Chapter 99 of the HTS. The free duty calculator checks each program for a given code, origin and date and shows which apply and why.

What fees are added to an import under HTS 2519?

Formal entries pay the Merchandise Processing Fee of 0.3464% of value (minimum $34.58, maximum $670.86 in FY2027). Ocean shipments also pay the Harbor Maintenance Fee of 0.125% of value. See the import duty calculator for how they combine.