HEADING 2521
Limestone flux; limestone and other calcareous stone, of a kind used for the manufacture of lime or cement
Part of Chapter 25 — Salt, Sulfur, Earths, Stone, Section V.
Subheadings and tariff lines
Recent CBP rulings on heading 2521
N349949
July 3, 2025
The country of origin of steel door hinges
N349950
July 3, 2025
The country of origin of steel door hinges
N348763
May 30, 2025
The country of origin of steel door hinges
F88860
November 22, 2000
ssuming that the calcium carbonate within the product is naturally derived, that no other chemicals or minerals are added to the product and that no chemical reactions take place when the calcium carbonate is combined with the water. For purposes of this ruling, we are assuming that the product is simply natural calcium carbonate derived from the earth and that the water is merely a carrier. In a telephone conversation with this office you stated your belief that these assumptions represent the facts applicable to this merchandise.
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