HEADING 2508

Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths:

Part of Chapter 25 — Salt, Sulfur, Earths, Stone, Section V.

Subheadings and tariff lines

Recent CBP rulings on heading 2508

Classifying products under 2508?

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