Abstract: The objective of this work is the study of the intrinsic tribological properties (reduction of friction and wear) of aoganimineral additives belonging to the family os soaps of diméthyle-3,5-hexanoique acid (noted acid cekanoïk CK8).The tribological behavior of the studied additives (friction and wear) is intially characterized on a macroscopic scale using an alternative trometer sphere/plane under the extreme conditions of pressure, temperature and shearing reigning in the contact, in order to place itself in limiting lubrification system.The wear reduction is associated to the formation of a tribologica film able to protect materials effectively.The mechanism of action strontium diméthyle-3,5-hexanoate is precisely studied. Electronic Microscopy in transmissionn particulary adpted to the study of the nanoparticles is the means put investigated to characterize the initial additive as well as film formed during tribological tests. Coupling of the various techniques of analysis electronic diffraction, the imaging filtered in energy, the spectroscopy of loss on energy of transmitted electrons (ELLS) and emission of X-rays (EDXS) contributes to determine the chemical composition, the physical and molecular struture of the plases before ond after friction.The comparison of the microstrutures makes it possible to highlight the physicochemical modification undergone by the additive under physical conditions reigning in the contact. In order to complete the study of the intrinsic tribological properties of the additive and tribological film, the investigations on a molecular scale are implented.