Barium Sulfate

Valued for its high density, chemical inertness, and opacity, barium sulfate is widely used as a weighting agent in oil and gas drilling muds, a filler in paints and coatings, and a radiopaque contrast agent in medical imaging — though pharmaceutical-grade material follows a distinct regulatory pathway. All US imports are classified under a single tariff line (2833270000). Germany and Italy are the leading foreign suppliers, with China also a significant source. Importers should be aware that Chinese-origin barium sulfate may be subject to Section 301 tariffs.