... Sodium Naphthalene Sulfonate Formaldehyde, naphthalene sulphonate water-reducing Appertaining to Shandong Wanshan Group, Shandong Wanshan Chemical Co., Ltd. ... being non-poisonous and pollution-free. FDN has been applied to highway, bridge, tunnel, water conservancy hydroelectric project, port, quay, ... welcome all friends from all over the world to visit our plant for cooperation based on mutual benefits. ...