Fleaker containers work as well as other glassware for liquids and solutions, but are  inappropriate for slurries, precipitates, and recrystallizations (since the narrow neck makes it difficult to remove solids completely from a Fleaker).
Fleaker containers function similarly to other glassware in handling liquids and solutions, yet they are not appropriate for slurries, precipitates, or recrystallizations (as their narrow neck makes solid removal challenging from a Fleaker).