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Silica Gel
Indicating / Non Indicating
Self-indicating silica gels will adsorb
moisture in exactly the same way as standard non-indicating (white)
silica gel, but they will literally indicate when they are becoming
saturated by changing their colour.
This is useful in two ways. Firstly, a silica gel sachet or breather
unit where the gel has changed colour, gives an immediate warning
that it should be replaced.
Secondly, if regenerating the silica gel, the self-indicating grade
will be ready for reuse, when its original colour has returned.
silica gels uses a small concentration (between 0.5 and 1.0% weight
for weight) of moisture sensitive cobalt chloride indicator, which
gives a blue silica gel. This changes to pink as it adsorbs moisture
and becomes saturated, returning to blue as it is regenerated.
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