In this final step, curing occurs through a series of chemical reactions. In addition, the sidewalls and tread are molded. Tire curing is a high-temperature and high-pressure batch operation in which the uncured tire is placed into a mold at a specified temperature. After the mold is closed, the rubber compound flows in to mold the shape and form the tread details and sidewall. The mold cannot be opened until the curing reaction is completed.