This Kuderna-Danish evaporative apparatus is used to concentrate materials in volatile solvents

It combines rapidity, simplicity, and quantitative efficiency, including the minimization of entrainment escape and transfer losses. The flask has a [ST] 19/22 inner joint on the bottom, and a reinforced [ST] 24/40 outer joint on top. The flask also comes complete with 89061-668 stainless steel springs used to connect it to the receiver. Receivers have [ST] 19/22 outer joint at top for connection to flask bottom. Column has a [ST] 24/40 reinforced outer joint at top, and a [ST] inner joint at bottom for connection to the flask. All components (except springs) are fabricated from borosilicate glass.