Indicating Silica Gel adsorbs (not absorbs) water vapour from the air. This means it traps moisture on its surface without swelling or becoming wet. It can adsorb up to 30% of its own weight in water vapour.
How does Indicating Silica Gel work?

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Indicating Silica Gel adsorbs (not absorbs) water vapour from the air. This means it traps moisture on its surface without swelling or becoming wet. It can adsorb up to 30% of its own weight in water vapour.

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