A peroxide solution of organic peroxide in an organic solvent, including at least one peroxide in a solvent, the solvent having a hydrophobic alcohol wherein the main carbonated chain having the alcohol function includes at least six carbon atoms, the solution also including a second, hydrophilic alcohol solvent representing a maximum of 15% wt. % of the solution. Also, a thermohardenable composition including said solution, and a method and a use relating to the composition.

A peroxide solution of organic peroxide in an organic solvent, including at least one peroxide in a solvent, the solvent having a hydrophobic alcohol wherein the main carbonated chain having the alcohol function includes at least six carbon atoms, the solution also including a second, hydrophilic alcohol solvent representing a maximum of 15% wt. % of the solution. Also, a thermohardenable composition including said solution, and a method and a use relating to the composition.