CAYCE, S.C. — Officials are working to learn more about the chemicals that triggered a hazardous materials response Thursday morning at Crystal Clean in Cayce.

Just before 7 a.m., vapors were spotted rising from a tanker truck at the company’s location at 627 Poplar Street. Fire crews determined potassium hydroxide and sodium hydroxide had accidentally mixed with motor oil and antifreeze, causing chemical off-gassing and heating inside the tanker.

Crystal Clean, an environmental service provider with locations across the United States, told News19 the company provides used motor oil collection and waste management services to small businesses and industrial clients. The Cayce site is the company’s only location in South Carolina.

Local officials confirmed the company has had no report

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