... formaldehyde condensate Sodium Naphthalene Sulfonate Formaldehyde, naphthalene sulphonate water-reducing Appertaining to Shandong Wanshan Group, Shandong Wanshan ... FDN has been applied to highway, bridge, tunnel, water conservancy hydroelectric project, port, quay, skyscraper, power engineering ... customers all over the world. Our "Wanshan" brand water-reducer has been widely used in industrial and ...