By David Reed, UT EditorMidland, Michigan--With effect from 1 Oct., Dow will increase prices for its Voranate TDI (toluene diisocyanate) by $0.10/pound while its polyether and copolymer polyol prices will rise $0.06/pound, according to a 1 Sep. announcement. These price adjustments apply to all market segments and end-use applications in the US and Canada, the firm's statement added."Unrelenting increases and volatility in energy and raw material costs, particularly natural gas, propylene and toluene, continue to impact our production costs and overall margins" says Chuck Reardon, North American product market manager, Dow Polyurethanes, in the prepared statment. "Our TDI margins, in particular, are at a historical low," he added. "Also, we are experiencing continued supply/demand tightness for propylene, propylene oxide and polyols. These price increases are necessary in order to help us keep pace with these rising costs," Reardon's statement concluded.Dow claims to be the world's largest producer of polyether polyols, under tradenames including Voranol, Voralux and Specflex. The firm is also a leading producer of quality aromatic isocyanates (such as MDI and TDI) and a major supplier of propylene oxide, an essential component of polyether polyols. Dow's polyurethanes products are used in rigid foams, flexible foams, adhesives, sealants, coatings, elastomers and agrifibres, as well as many other applications."