For special applications, double jacketed glass reactor 100l is designed with a jacket for heating or cooling. Jacket is sealed to the vessel with Viton 'O' ring and other sealing compositions. The seal prevents high stresses between vessel and jacket by allowing the movement flexibility between two due to thermal expansion. This double jacketed glass reactor 100l can be used for vacuum stirring reaction, high temperature and low temperature reaction, constant speed operation mixing reaction, distillation, reflux, concentration reaction,negative pressure operation and so on.