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The United States has initiated another anti-dumping investigation against Canada, this time involving sodium sulfate anhydrous.

The Department of Commerce says the investigation was initiated based on a petition filed March 28 by three U.S. companies: Cooper Natural Resources Inc., Elementis Global LLC and Searles Valley Minerals Inc.

The alleged dumping margins for Canada range from 43.37 to 170.08 per cent.

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An estimated US$5.7 million worth of sodium sulfate anhydrous, which is used as a drying agent, was imported from Canada last year.

The U.S. has previously initiated investigations against imports of lumber, Bombardier airplanes, newsprint, welded pipe and structural steel.

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