P 6900 (OTTO) Poly(sodium 4-styrenesulphonate) average Mw ~70,000 Cas 25704-18-1 - used a mixed coating of Bismuth film electrodes. P 6900 (OTTO) Poly(sodium 4-styrenesulphonate) average Mw ~70,000 Cas 25704-18-1 - used in reactive emulsifier, dye modifier, water-soluble polymer (flocculant, dispersing agent, container cleaning agent, cosmetic)sulfur exchange resin(mebrane) photo agentia(mebrane), semiconductor, image film, heat transfer products and other fields.