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Mr Wallis said: "We collected samples and sent them for testing. It contained chrysotile - otherwise known as white asbestos."

On Monday, EPA Administrator Michael Regan said the ban applied only to chrysotile asbestos, also known as "white asbestos", the only type known to be imported for use in the US.

The EPA now expects the rule on chrysotile asbestos, also known as “white asbestos,” in the fall.

Of the 975 schools named by DE as containing asbestos, almost all contain chrysotile.

About 300 metric tons of chrysotile asbestos were imported to the U.S. in 2020, according to a United States Geological Survey Mineral Commodity Summaries report.