Canada's decision to label as toxic a chemical that is used to make a popular form of plastic has created headaches for some makers of baby bottles, sports water bottles and other food and beverage containers. Sally McCoy, the chief of CamelBak, a sports bottle maker, switched plastics, even though the substitute costs more. But it may prove to be a bonanza for companies like Eastman Chemical, which makes a comparable plastic without the offending ingredient, as well as for makers of glass and food-grade stainless steel. The Canadian government took the action last week against the chemical bisphenol-a, or BPA. Animal studies indicate that the chemical, which mimics a human hormone, can induce long-term changes in animals exposed to it. BPA is used in polycarbonate plastic, a favorite material for bottles and other containers because it is as hard and transparent as glass but resists shattering. Canada has banned only infant bottles made with the substance, and says that polycarbonate containers of all types are safe for anyone over the age of 18 months. Nevertheless, most of Canada's major retailers have stripped polycarbonate containers from shelves, and leading makers of sports bottles and containers are rapidly moving toward alternative plastics and other materials. "Regardless of what the data may prove 20 years from now about polycarbonates, there's no sense in pushing a rope uphill on that,' said Sally McCoy, the president and chief executive of CamelBak, a sports bottle maker based in Petaluma, Calif. While the reaction against polycarbonate in the United States has not reached the level that it has in Canada, 10 states, including California and Massachusetts, as well as Congress are dealing with proposed legislative bans on the plastics. "There is a an extraordinary fear level right now, whether or not it is justified on the scientific side,' said Carol Schreitmueller, director of research and development for Pacific Market International, the maker of Aladdin food containers and water bottles, based in Seattle. "It is going to change what happens to materials. We have to decide if people will trust this material anymore.' But Ms. Schreitmueller need not worry about retailers taking her company's water bottles off their shelves. Since February, those Aladdin products have been made with Tritan copolyester, a product that Eastman introduced last October, in what has since become a happy coincidence. Eastman says it is the first plastic that has the advantages of polycarbonate but is not made using BPA. Faced with that outlook, most leading makers of sports bottles and containers are rapidly moving away from polycarbonates to alternative plastics and other materials. Their headaches may prove to be a bonanza for companies like Eastman Chemical as well as makers of glass and food- grade stainless steel. Ms. Schreitmueller began her hunt for polycarbonate alternatives back in 2001. At the time, the Aladdin company was developing coffee and tea mugs for sale in Japan, where concerns about BPA were already developing. The Japanese mugs were ultimately made using styrene acrylonitrile, a plastic made by Lanxess, a German chemical producer. But that plastic is not as transparent as polycarbonate, and it cracks when dropped on a hard surface. Other materials Ms. Schreitmueller reviewed had poor survival rates in dishwashers. In 2006, after noticing a rise in concern about BPA in North America, Ms. Schreitmueller began phoning "pretty much every chemical company in the world' to see whether they were developing a BPA-free plastic that offered polycarbonate's strength, clarity and resistance to imparting or absorbing flavor. "I only got one