The properties of pentaamine (5-cyano-2H-tetrazolato-N2) cobalt (III) perchlorate (CP), which was first synthesized in 1968, continues to be of interest for predicting behavior in handling, shipping, aging, and thermal cook-off situations. We report coefficient of thermal expansion (CTE) values over four specific temperature ranges, decomposition kinetics using linear and isothermal heating, and the reaction to three different types of stimuli: impact, spark, and friction. The CTE was measured using a Thermal Mechanical Analyzer (TMA) for samples that were uniaxially compressed at 68.95 MPa and analyzed over a dynamic temperature range of -20 degrees C to 70 degrees C. Differential scanning calorimetry, DSC, was used to monitor CP decomposition at linear heating rates of 1-7 degrees C min(-1) in perforated pans and of 0.1-1.0 degrees C min(-1) in sealed pans. The kinetic triplet was calculated using the LLNL code Kinetics05, and predictions for 210 degrees C and 240 degrees C are compared to isothermal thermogravimetric analysis (TGA) experiments. Values are also reported for spark, friction, and impact sensitivity.