Restoration is carried out at a temperature of 120 °C for 16-20 h, i.e. until silica gel changes its colour
lor an intensive-blue one.
Cool the restored silica gel in the closed vessel and pour it in the dehydrator plug, screw in the cap,
screw the desiccator in the container.
A spare dehydrator plug without a protective container and the restored silica gel must not be exposed
to the open air for more than two minutes to avoid saturation of silica gel with moisture from the
surroundings.
Silica gel can be restored unlimitedly, in doing so its absorbing capacity is preserved.
However the service life of silica gel is decreased in case of its contamination.
Therefore in assembling and dismantling of the desiccator and restoration of silica gel one should
handle it carefully, avoid touching it directly with hands and calcinating it in dusty premises.
Supplement 2
F I G U R E S
