Terphenyls are a group of closely related aromatic hydrocarbons. Also known as diphenylbenzenes or triphenyls, they consist of a central benzene ring substituted with two phenyl groups. The three isomers are ortho-terphenyl, meta-terphenyl, and para-terphenyl. Ortho-terphenyl is white crystal and soluble in benzene, acetone and chloroform, insoluble in water, which is widely used in manufacturing luminous diode, liquid crystal and lithium battery. The purity of DYNOVA® ortho-terphenyl is as high as 99.9%.