Pointed butt
A pointed bulb is a glass bulb used in chemistry that tapers towards the bottom. It is mostly made from highly heatable borosilicate glass .
Pointed flasks are usually not used as reaction flasks, but as a collecting vessel for distillations . The slimmer shape than with round-bottom flasks allows more or larger flasks to be accommodated at the outlet (“spider”) of a distillation apparatus. The pointed shape is less vacuum-tight than comparable round-bottom flasks , however, it allows the smallest amounts of liquid to be picked up and reused with less loss than with a round-bottom flask with a pipette . Also, a phase separation is possible, however, succeed in larger volumes in the separating funnel usually better.
Individual evidence
- ^ Brockhaus ABC Chemie , VEB FA Brockhaus Verlag Leipzig 1965, pp. 702-703.