Ramis Soriano J., Alba Fernández J., Gadea J., Escuder Silla E., Ivorra Chorro S.

The loss factor and the elastic characteristics are parameters of special relevance for the calculation of the sound insulation of constructive elements. The constructive solutions based on monolithic and laminated glasses are more frequent every day. Therefore, it is of great interest to know the measurement techniques and their limitations with the intention of being able to limit the uncertainties in calculations of the sound insulation. In the laminated glasses takes part several layers of monolithic glasses related with a layer of an organic compound (usually Polibutil-Vinyl (butiral or PVB)) whose nature is crucial in the global behavior of the element. It can be considered as a classic multilayer structure. In this work, the limitations of the experimental techniques that are applied for to determine the loss factor of the different layers are discussed. It is studied for monolithic glasses anf for different layers of PVB. In addition, it is carried out a study of the consequences that the uncertainties in the determination of the loss factor cause in the calculation of the sound insulation.