BETHESDA, Md.-Safe Brands Corp., maker of Sierra' antifreeze-coolant, has launched the second phase of its nationwide zoo antifreeze conversion program. In conjunction with the Bethesda-based American Zoo and Aquarium Association (AZA), the company has convinced 36 participating zoos to convert the coolant in their fleet vehicles to Sierra, a propylene-glycol-based antifreeze, said to be safer and less toxic than conventional ethylene-glycol-based antifreezes.
Safe Brands said one teaspoon of ethylene glycol antifreeze can cause a cat's death, less than two ounces is enough to kill a dog, and as little as two tablespoons can be hazardous to a small child.
Millions of gallons of antifreeze are leaked, spilled or improperly disposed of into the environment each year, the company noted.
Sydney J. Butler, the AZA's executive director, said while no antifreeze poisoning has occurred at an AZA zoo, recently in the wild, a California condor and a polar bear died as a result of ingesting ethylene glycol-based antifreeze.
In the first phase of Omaha, Neb.-based Safe Brand's conversion program, launched last year, 14 accredited zoos switched to Sierra antifreeze.