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The B1/B2 phase transformation in potassium chloride (KC1) under shock loading conditions has been investigated using constantan strain gauges. These have been mounted in the samples in such an orientation so that they are sensitive to longitudinal strain. The samples themselves are made from pressed, polycrystalline potassium chloride. At the phase transformation stress of ca. 2 GPa, measured strains of ca. -0.1 are slightly higher than values calculated from knowledge of the particle and shock velocities at that stress level. Residual porosity in the microstructure has been suggested as a possible cause. Total strains over the stress range 2.5 GPa to 4.0 GPa show reasonable agreement with the work of others at lower stresses, but some disagreement at higher stress levels. We suggest that this might be due to the material being in a non-equilibrium state at the time of measurement. [ABSTRACT FROM AUTHOR]