Due to high raw material and energy costs, Huntsman Polyurethanes, a business unit of Huntsman Corporation, said that it will have to raise the prices of its MDI isocyanates, polyols and systems in all North American and South American markets. Beginning Nov. 1, or as contracts allow, Hunstman will increase the price of MDI isocyanates by $0.08 per pound, polyols $0.10 per pound and systems $0.09 per pound.