The Food and Drug Administration banned the sale of soaps containing certain antibacterial chemicals on Friday, saying industry had failed to prove they were safe to use over the long term or more effective than using ordinary soap and water. In all the F.D.A. took action against 19 different chemicals and has given industry a year to take them out of their products. About 40 percent of soaps - including liquid hand soap and bar soap - contain the chemicals. Triclosan, mostly used in liquid soap, and triclocarban, in bar soaps, are by far the most common. The rule applies only to consumer hand washes and soaps. Other products may still contain the chemicals. At least one toothpaste, Colgate Total, still does. Public health experts applauded the rule, which came after years of mounting concerns that the antibacterial chemicals that go into everyday products are doing more harm than good. Experts have pushed the agency to regulate antimicrobial chemicals, warning that they risk scrambling hormones in children and promoting drug-resistant infections. Studies in animals have shown that triclosan and triclocarban can disrupt the normal development of the reproductive system and metabolism, and health experts warn that their effects could be the same in humans.