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Understanding Desiccators in Labs is a document available to read on EtoBox.

Desiccators are sealable glass containers containing desiccant that protect moisture-sensitive chemicals from humidity by absorbing atmospheric moisture. They work best for chemicals that do not react quickly with water, as opening the desiccator exposes contents to air and it takes time to re-establish low humidity. Common desiccators have a removable shelf above a bed of silica gel desiccant, and vacuum models can further remove air and moisture when evacuated using grease-sealed flanges and occasional re

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