In presented paper a proposal of granular damper prototype has been presented. Granular damper works on the basis of a core made of special granular structure. Idea of special granular structure consists of placing loose granular grains into a hermetic envelope, wherein in the next stage a partial vacuum is generated. Difference between an atmospheric pressure, externally surrounding the core and internal one, causes occurring friction forces between single grains. Interacting friction forces are greater for higher values of internal underpressure. In presented work author focuses on analysis of experimental results obtained for the whole family of granular cores. Variations in energy dissipation possibilities are particularly described in this paper.