Volumetric flask

The flask's mouth is either furnished with a plastic snap/screw cap or fitted with a joint to accommodate a PTFE or glass stopper.

The neck of volumetric flasks is elongated and narrow with an etched ring graduation marking.

Volumetric flasks are of various sizes, containing from a fraction of a milliliter to hundreds of liters of liquid.

Where this is not required, a lower standard (Class B or equivalent) is used for qualitative or educational work.

Volumetric flasks are generally colourless but may be amber-coloured for the handling of light-sensitive compounds such as silver nitrate or vitamin A.