Rayonier Advanced Materials (RYAM) said Tuesday it filed petitions with the US government alleging that Brazilian and Norwegian manufacturers are selling high-purity dissolving pulp in the US at "unfair prices, below fair market value or based on government subsidies."

The dumping margins are as high as 168% for Brazil and 226% for Norway, and the petitions also identify 30 Brazilian government programs that may be providing subsidies, according to a statement.

The US Department of Commerce will investigate whether dumping and subsidization are occurring, and the US International Trade Commission will determine whether the US industry is suffering material injury as a result, Rayonier said. If both agencies make affirmative findings, duties will be imposed, the company said.

Rayonier filed the petitions together with the United Steelworkers union, the statement said.