DURAN® Vigreux Column, with 2 standard ground joints, with slide-on glass jacketDURAN Vigreux Column, NS 24 29, 450 mm Vigreux columns are used in fractionated distillation for improved separation of substances. The slightly downward angled indentations considerably increase the contact surface between the gas phase and the glass, i. e. the cooling surface. Features and Benefits: Tight closure due to standard ground joint With slide on glass jacket Application: Fractional distillation, Laboratory coolers, condensation of gases