High Tc superconducting bismuth cuprate Bi2Sr2Ca1Cu2O8 (2212) is produced by a sol-gel reaction method. A series of grinded (2212) - polycrystalline solid tin composites in the composition interval 10 - 90 vol % is made. SEM microscopy and elementary microprobe analysis are performed to identify parasitic phases at low concentration. The density is measured which gives information on gas inclusion and wetting of oxide grains by tin. Magnetic susceptibility and complex electrical impedance as functions of frequency are measured in order to correlate electrical path and composition. A threshold composition such as 70 < (2212) vol. % < 80 is determined, above which a high temperature procedure of preparation of the composite samples allows the sintering of the (2212) phase as indicated by the presence of the imaginary component of the magnetic susceptibility. A pure resistive and a partly capacitive impedance of sintered and not sintered composites respectively is evidenced in samples with (2212) vol. % > 70.