Natural rubber latex is used as a matrix material. Nanostructured carbon black (mean particle diameter - 30 nm, dibuthyl phthalate adsorption - 380ml/100g, specific surface - 950 m2/g) is used as filler. Mixing was performed on cold rolls in Baltic Rubber factory. Raw material was cured in 1*15*120mm slices between two 50μm thick brass sheets in stainless steel mold, using different mold pressures from 10 to 100kg/cm2 by step of 10. Resulting product was carefully cut into 10 similar pieces by dimensions of 1*10*15mm each. Each piece represents a sample - piezo resistant sensor cell with regular brass electrodes. The specific electrical resistance of samples was measured in unstressed state (Fig.1). Finally, the piezo resistive sensitivity was determined and conclusions about influence of mold pressure on sensing properties were made.