TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The composition further comprises a hydroxy terminated dimethyl siloxane. Preferred Components: The metal of the metal borohydride salt is at least one of an alkali metal, an alkaline earth metal or transition metal. The metal borohydride salt is aluminum borohydride (preferred), lithium borohydride, sodium borohydride magnesium borohydride, titanium borohydride or zirconium borohydride. The polydialkylsiloxane is polydimethylsiloxane. The composition is a liquid or a gel and the aluminum borohydride is present at 2-50 wt.% of the stabilized aluminum borohydride mixture. The polydimethyl siloxane is present at 50-95 wt.%, and the amorphous fumed silica is present at 5-25 wt.% of the composition, where the total wt.% of the polydimethyl siloxane and amorphous fumed silica cannot be greater than 98 wt.% of the composition. The polydimethyl siloxane is present at 50-95 wt.% of the polydimethylsiloxane-amorphous fumed silica mixture, the amorphous fumed silica is present at 5-25 wt.%, and the amorphous fumed silica is present at 2-15 wt.%, where the total wt.% of the polydimethyl siloxane, amorphous fumed silica and amorphous fumed silica cannot be greater than 98 wt.% of the composition. The stabilized mixture of the metal borohydride, the polydialkylsiloxane and amorphous fumed silica is a liquid or a gel. The molar ratio of the lithium borohydride to the aluminum chloride is one half -3. The complex metal borohydride is aluminum borohydride. In the method (II), the composition comprising polydimethylsiloxane and an amorphous fumed silica further comprises hydroxyterminated dimethyl siloxane. Preferred Method: The method (I) further comprises: condensing the synthesized metal borohydride into a container having a mixture comprising the polydialkylsiloxane and the amorphous fumed silica. The solid state synthesis comprises reacting metal borohydride a metal salt, where the metal salt is aluminum chloride and the metal borohydride is lithium borohydride. EXAMPLE - No suitable example given.