Shrimp exoskeleton was demineralized using lactic acid and the kinetics of the demineralisation was studied. The residual concentration of calcium after acid treatment was used as a measure of the degree of demineralisation. Kinetic data was obtained using five acid concentrations (0.2, 0.4, 0.6, 0.8 and 1M) and the obtained kinetic data was fitted to the shrinking core model. For all concentrations, the best predictive model was determined to be ash layer diffusion controlled mechanism.