Used as a reference in analytical testing to calibrate instruments and validate methods for cationic surfactant analysis. Commonly applied in quality control of detergents, disinfectants, and personal care products where cetyltrimethylammonium bromide acts as a surfactant. Ensures accurate quantification in titrations, spectrophotometric assays, and HPLC. Also used in research to study micelle formation and surface activity behavior under controlled conditions.