A polyorganosiloxane composition that can be vulcanized at high temperature to a silicone elastomer, useful in the field of the manufacture of electrical wires or cables having an improved fire performance is provided. The method for preparing I-III-VI2 nanoparticles comprises the steps of: preparing a mixed solution by mixing each element from groups I, III and VI in the periodic table with a solvent; sonicating the mixed solution; separating the solvent from the sonicated mixed solution; and drying the product resulted from the above step to obtain nanoparticles. The elastic detent includes an upper transverse section and a lower transverse section. The cavity can have a broadest dimension of less than 500 nanometers. The ordering rule controller is adapted to perform the selection according to predefined command ordering rules.