(plastemart) -- Keyuan Petrochemicals, Inc. has commenced construction of its first Styrene-Butadiene-Styrene ("SBS") production facility in Ningbo, Zhejiang Province, which will be adjacent to its current production facility. SBS is commonly used in soles of shoes, tire treads and other products that require a hard rubber to remain sturdy for a long time due to its durability. The new SBS facility is expected to add 70,000 tons to Keyuan's production capacity by end-2011, with an estimated cost of US$17.5 mln in capital expenditures.