Used as a contrast agent in medical imaging, particularly in X-ray and CT scans of the gastrointestinal tract. It helps visualize the esophagus, stomach, and intestines due to its ability to block X-rays, creating clear outlines of internal structures.

Commonly administered orally or by enema, it is inert and not absorbed by the body, making it safe for diagnostic use.

Also used in oil and gas drilling fluids as a weighting agent to control well pressure.

In manufacturing, it serves as a filler in plastics, rubber, and paints to improve density, brightness, and resistance to acids.

Used in the production of certain types of paper to enhance smoothness and print quality.

Employed in some coatings and pigments for its low conductivity and high chemical stability.