Isothermal crystallization is a sensitive test and can be used to show the difference between various batches of material, which may show little difference under a conventional heating experiment. For polymer resin manufacture, it can be used for quality assurance purposes, the optimization of resin formula or the evaluation of a competitor’s resin. This application note demonstrates why PerkinElmer® DSC 8000 with power compensation is the ideal tool for isothermal crystallization experiment.