Specialised laboratory glassware for azeotropic distillation, the Dean–Stark apparatus is used to separate and measure water or other immiscible liquids from reaction mixtures during reflux. Commonly applied in moisture determination and dehydration reactions, it enables continuous removal and collection of condensate while returning the organic phase to the reaction flask. Manufactured from chemically resistant borosilicate 3.3 glass with standardised joints, Dean–Stark apparatus assemblies integrate seamlessly into distillation and reflux setups. They are widely used in research, industrial and advanced teaching laboratories.