无色单斜结晶。无气味。加热到40度以上开始失水，到80度以上成为一水合物，但继续加热不会变灰无水物。易溶于水，几乎不溶于醇和乙酸乙酯和乙醚。密度： 3.09

Q（HG）SJ　682-95
项目Item　　                                      分析纯　　  化学纯
                                                  （AR）      （CP）
含量(3CdSO₄·8H₂O)Assay,%                         ≥99.0       99.0
pH(50g/L溶液，25℃)                               ≤4.0        4.0
澄清度试验Clarity                                  合格        合格
水不溶物Insoluble matter in water,%               ≤0.003      0.005
氯化物(Cl)Chloride,%　                            ≤0.001      0.003
总氮量(N)Total nitrogen,%                         ≤0.002      0.006
铝(Al)Aluminum,%                                  ≤0.005      0.01
铁(Fe)Iron,%                                      ≤0.0002     0.0006
铜(Cu)Copper,%                                    ≤0.001      0.002
锌(Zn)Zinc,%                                      ≤0.002      0.005
砷(As)Arsenic,%                                   ≤0.00005    0.0001
铅(Pb)Lead,%                                      ≤0.1        0.02
硫化铵不沉淀物(以硫酸盐计)Substances not
precipitated by ammonium sulfide,%                ≤0.1        0.2

镉、铜、镍的电解淀积，制造标准镉元素，马许氏试砷法的触媒，测定硫化氢，检定反丁烯二酸，电镀镉。