Sodium silicate, Water glass.     
class                                Item                               Index  
liquid                        Silicon dioxide(%)             ≥26.0 ≥29.2 ≥25.7
                                 Sodium oxide(%)               ≥8.2 ≥12.8 ≥10.2
                                 Baume degree                       39.0-41.0 50.0-52.0 44.0-46.0
                                 Water insoluble matter(%) ≤0.10 ≤0.10 ≤0.10
                                Fe(%)                                  ≤0.03 ≤0.03 ≤0.03
                                Modulus                                  3.1-3.4 2.2-2.5 2.6-2.9
solid                        Solvable solid(%)                 ≥99 ≥99 ≥99
                                Fe(%)                                    ≤0.02 ≤0.02 ≤0.02
                               Modulus                                 3.1-3.4 2.2-2.5 1.9—2.1