碱式碳酸镁，五水

(MgCO3)4·Mg(OH)2·5H2O

性状：白色疏松粉末。
分子量：485.65
技术条件
氯化物（Cl）                                                                 ≤ 0.01%
硫酸盐（SO4）                                                             ≤ 0.02%
硝酸盐（NO3）                                                             ≤ 0.005%
磷酸盐（PO4）                                                              ≤ 0.001%
重金属（以pb计）                                                         ≤ 0.002%
钙（Ca）                                                                       ≤ 0.1%    
铁（Fe）                                                                       ≤ 0.005%
锌（Zn）                                                                      ≤ 0.005%               
钡（Ba）                                                                       合格
碱式碳酸盐                                                                    ≤ 0.4%
水溶物                                                                          ≤ 0.001%
酸不溶物及氨水沉淀物                                                   ≤ 0.025%
含量（以MgO计）                                                     40.0~44.5%