A review with 71 refs. covering H2O2 physical and chemical property data, commercial preparation and applications of H2O2 as bleaching agent for paper, pulp, and linen, purifier for wastewaters, etc., as propellant, oxidant (e.g., for olefins to yield oxiranes; for aromatics to yield, e.g., 9,10-anthiraquinodione), and constituent of transition metal-H2O2 (peroxo or oxo) compounds used to catalyze epoxidation and ethoxylation reactions, etc.