A disinfectant is a chemical or physical agent that is applied to inanimate objects to kill microorganisms. Bleach (sodium hypochlorite), phenolic compounds, and formaldehyde are examples of disinfectants. A sterilant is a chemical or physical process that is applied to inanimate objects to kill all microorganisms as well as spores. Glutaraldehyde and ethylene oxide are examples of sterilants.