Three different brands of polycarbonate baby feeding bottles (from three different manufacturers, A, B, and C) and a brand of polycarbonate drinking water bottles (from the same manufacturer) with RIC "7" were purchased in replicates from randomly selected supermarkets in Wurukum and Modern markets, Makurdi, Benue State of Nigeria. The bottles were confirmed to be polycarbonate using differential scanning calorimeter (DSC). The DSC shows thermal transition data such as glass transition temperature, melting point, crystallization, and the relief of residual stress from the manufacturing process. The DSC does this by comparing the heat flow between an empty pan and a pan that has plastic sample. The DSC rsmps the temperature of both pans at the same time and tries to keep the temperature of both pans equal. The DSC must provide additional heat to pans with sample that undergo melting (endothermic process) or a glass transition and less heat to samples undergoing crystallization (exothermic process).