The most basic kind of accessible peroxide is hydrogen peroxide (h2o2), which is an oxygen-oxygen single bond. It is a transparent, colourless, and non-flammable substance. Pure hydrogen peroxide is a crystalline solid below 12°F and a colourless liquid with a Needs Chemical.

The most common application for hydrogen peroxide is as an aqueous solution. Diluted versions, ranging from 3% to 10%, are also available for domestic use. The industrial usage of hydrogen peroxide in a concentrated form (more than 30%). The effects of hydrogen peroxide as a disinfectant and bleaching agent are significantly greater.