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無色單斜結(jié)晶。無氣味。加熱到40度以上開始失水，到80度以上成為一水合物，但繼續(xù)加熱不會變灰無水物。易溶于水，幾乎不溶于醇和乙酸乙酯和乙醚。密度： 3.09

Q（HG）SJ　682-95
項目Item　　                                      分析純　　  化學(xué)純
                                                  （AR）      （CP）
含量(3CdSO₄·8H₂O)Assay,%                         ≥99.0       99.0
pH(50g/L溶液，25℃)                               ≤4.0        4.0
澄清度試驗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
總氮量(N)Total nitrogen,%                         ≤0.002      0.006
鋁(Al)Aluminum,%                                  ≤0.005      0.01
鐵(Fe)Iron,%                                      ≤0.0002     0.0006
銅(Cu)Copper,%                                    ≤0.001      0.002
鋅(Zn)Zinc,%                                      ≤0.002      0.005
砷(As)Arsenic,%                                   ≤0.00005    0.0001
鉛(Pb)Lead,%                                      ≤0.1        0.02
硫化銨不沉淀物(以硫酸鹽計)Substances not
precipitated by ammonium sulfide,%                ≤0.1        0.2

鎘、銅、鎳的電解淀積，制造標準鎘元素，馬許氏試砷法的觸媒，測定硫化氫，檢定反丁烯二酸，電鍍鎘。