Composition comprises at least one insecticide and/or at least one fungicide, where the composition further comprises at least one flame retardant comprising nitrogen and phosphorus compound. An independent claim is included for a process for treatment of at least one piece of wood or its wood material comprising exposing at least one part of the composition, for simultaneously depositing at least one flame retardant, an insecticide and/or fungicide on the piece.Linvention concerne une composition pour le traitement du bois ou de matériaux dérivés du bois, ladite composition comportant au moins un insecticide et/ou au moins un fongicide.Selon linvention, cette composition comprend au moins un agent ignifugeant choisi parmi les composés azotés et phosphorés.
