TOKYO, Dec 5, 2016 - (JCN Newswire) - Showa Denko ("SDK"; TSE:4004) has developed new-grade products to be added to the lineup of its high-purity solvents, "Solfine(TM)" series, and decided to install a new purification plant to produce the new-grade products at its Tokuyama Plant in Shunan City, Yamaguchi Prefecture, Japan. Today SDK had a...