Used as a contrast agent in medical imaging, particularly in X-ray and CT scans of the gastrointestinal tract. It helps outline the esophagus, stomach, and intestines, providing clear images of organ structure and function. Due to its insolubility and high density, it effectively blocks X-rays, enhancing visibility of soft tissues. Commonly administered orally or by enema, depending on the area being examined. It is not absorbed by the body, making it safe for diagnostic use with minimal risk of toxicity. Also used in oil and gas drilling as a weighting agent in drilling fluids to control well pressure. Its high density helps stabilize the drilling process and prevent blowouts. In manufacturing, it serves as a filler in plastics, paints, and coatings to improve density, brightness, and resistance to acids. It is also used in the production of lithopone, a white pigment, and in some types of paper to enhance smoothness and print quality.