The Dow Chemical Company announced in the US on Tuesday that it will raise the price of its products by as much as an additional 25 percent in July in an effort to offset the continuing "relentless rise" in the cost of energy and hydrocarbon feedstocks. The 25 percent hike — the largest in the company’s history — comes after a 20 percent rise last month that the company said did not go far enough given the continuing surge in energy prices. Also on Tuesday, South Korean company Posco, one of the world’s largest steel producers, said that it was raising prices by more than 20 percent. That followed an agreement Monday between the global mining company Rio Tinto Group and the biggest steel maker in China, Baosteel, to raise the price Baosteel pays for Australian iron ore by as much as 97 percent.