TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The hygroscopic inorganic salt is alkaline-metal and alkaline earth-metal perhalogenates or alkaline-metal and alkaline earth-metal halides, where the alkali metal and alkaline earth-metal perhalogenates are per chlorates. The solution comprises a common solvent for the polymer and the hygroscopic inorganic salt. The alkali-metal perhalogenates are per chlorates. Preferred Method: The sorber is manufactured by evaporation of solvents from a solution comprising the polymer and the dissolved hygroscopic inorganic salt. The hygroscopic inorganic salt is dissolved in a polymer precursor or a mixture of at least a polymer and a polymer precursor that constitutes a solvent for the inorganic salt.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The sorber is introduce in the sensitive device by melting of the composite sorber.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The polymeric matrix is formed starting from two different polymers and/or two precursors. The polymers or its precursors act as cross-linking agent for the polymeric matrix. The polymer precursor is its monomer. The polymeric composite sorber has the form of nanofibers. Preferred Method: The nanofibers are manufactured by the technique of electrospinning. The polymeric matrix is obtained by the combination of two different types of polymers or of their precursors or a mixture of at least a polymer and a polymer precursor, where one of the polymers or polymer precursors acts as cross-linking agent for the polymeric matrix. The composite sorber is dispensed inside of the sensitive device before the final step of consolidation of the sorber. The dispensation occurs by serigraphy. The final step of consolidation is a thermal or UV-promoted polymerization. EXAMPLE - Magnesium perchlorate (0.4 g) as an inorganic salt was dissolved in methylmethacrylate as a polymer matrix (5 g) and benzoin methyl ether (0.05 g). The polymerization was carried out inside a chamber. The pre-polymerized solution was spread out to give a film of a polymeric composite sorber.