Double dodecyl dimethyl ammonium chloride (DDAC), Cas: 7173-51-5 has good bactericidal effects on Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, Legionella pneumophila, Fusarium oxysporum, enveloped and non enveloped viruses. Compared with single chain Quaternary Ammonium Salts, Double dodecyl dimethyl ammonium chloride (DDAC), Cas: 7173-51-5 has significant improvements in sterilization efficiency and influencing factors, and can effectively kill bacterial reproductive bodies, fungi, and lipophilic viruses. It has good water solubility and the ability to reduce surface tension, and can be used for preventive disinfection during the prevention and control of new respiratory infectious diseases. Double dodecyl dimethyl ammonium chloride (DDAC), Cas: 7173-51-5 is one of the third generation products of Quaternary Ammonium Salt bactericide, and its bactericidal ability is significantly higher than that of the second generation products. It can be used as a Bactericide and algaecide in oilfield water injection and industrial circulating cooling water systems.