Product & Services

A cryogenic storage dewar is a specialised type of vacuum flask used for storing cryogens (such as liquid
nitrogen or liquid Oxygen), whose boiling points are much lower than room temperature. Cryogenic storage dewar
may take several different forms including open buckets, flasks with loose-fitting stoppers and self-pressurising tanks.
All dewar have walls constructed from two or more layers, with a high vacuum maintained between the layers. This
provides very good thermal insulation between the interior and exterior of the dewar, which reduces the rate at which the
contents boil away. Precautions are taken in the design of dewar to safely manage the gas which is released as the
liquid slowly boils. The simplest dewar allows the gas to escape either through an open top or past a loose-fitting stopper
to prevent the risk of explosion. More sophisticated dewar trap the gas above the liquid, and hold it at high pressure.
This increases the boiling point of the liquid, allowing it to be stored for extended periods. Excessive vapour
pressure is released automatically through safety valves. The method of decanting liquid from a dewar depends upon its
design. Simple dewar may be tilted, to pour liquid from the neck. Self-pressurising designs use the gas pressure in the top
of the dewar to force the liquid upward through a pipe leading to the neck.