Basic information: 1) Chemical name:Sodium Salt of Polynaphthalene Sulfonic Acid 2) CAS number:36290-04-7 3) Standard: GB 8076-2008 Specification (3 series): Appearance: Light Brown Powder Solid content:92.0% max Sodium sulphate: A 5%/ B 10%/ C 20% max Chloride content: A 0.3% B 0.4% C 0.5% max pH value:7-8 Surface tension:68-72 n/m Cement flowing rate: A 250 B 240 C 230mm min Concrete reducing water rate:20% min Save cement rate: over 18% Steel-bar corrosion: None