2,6-naphthalene disulfonic acid disodium salt/ 1655-45-4 best quality, lowest price We are a leading supplier of 2,6-naphthalene disulfonic acid disodium salt in China, our specification as following:appearance: white powderPurity: 98%min.Aassay: 90%min.Salt: 5%max.Acid: 1%max.Insoluble matter: 0.3%max 2,6-naphthalene disulfonic acid disodium salt/ 1655-45-4