Abstract: A method and container for transporting and storing chemical compounds susceptible to exothermic decomposition. The method including placing the chemical compounds in a container where the opening and the rim of the container are sealed by means of a cover and a clamping strap, and the clamping strap is designed to release the cover from the rim of said container at a predetermined level of superatmospheric pressure in the container to open up the entire top for relief of the superatmospheric pressure. When exothermic decomposition occurs, the invention provides substantial and instant pressure relief, which, in turn, avoids cracking and/or fragmentation of the container.