Amazon faces a $350,000 fine from the U.S. Federal Aviation Administration after shipping a corrosive chemical by air, in violation of federal law. It’s the 25th time the company has been found to violate hazardous chemical shipping regulations in two and a half years.

The latest case concerns a one-gallon container of “Amazing Liquid Fire,” a corrosive drain cleaner that was sent by air from Louisville, Kentucky, to Boulder, Colorado, on October 15, 2014.

During its transit, the container leaked and nine UPS employees came into contact with the chemical. They reported a burning sensation on their skin and had to be treated with a chemical wash.

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