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, other

HTS 2519.90 is a 6-digit subheading of the U.S. Harmonized Tariff Schedule covering 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, other. It belongs to Chapter 25 and rolls up 3 10-digit statistical lines that brokers actually file at entry.

Every 10-digit line under HTS 2519.90 carries a general (Column 1) duty rate of Free. Section 301, Section 232, and AD/CVD overlays may stack on top of this rate at the per-line level — open a specific 10-digit code to see its complete tariff stack.

U.S. Customs requires entries to be filed at the 10-digit statistical level — the broader subheading HTS 2519.90 is not directly fileable. Match your product description to the most specific 10-digit line in the list on this page; if multiple lines could apply, the General Rules of Interpretation (GRIs) and chapter notes determine which one governs.

No active AD/CVD (antidumping or countervailing duty) orders currently flag any line under HTS 2519.90 in Tandom's catalog. Tandom monitors Federal Register notices daily; any new orders will appear here within 24h of publication.