Desiccant

Desiccant

Definition

A desiccant is a moisture-absorbing substance used to control humidity and prevent mold, mildew, or other moisture-related damage near artwork, framed pieces, or archival materials.

Types of Desiccants

• Silica Gel: Commonly used in small packets inside packaging or display frames.
• Clay Desiccants: Naturally occurring, inexpensive, and effective for general humidity control.
• Calcium Chloride: Highly absorbent, often used in larger storage or shipping containers.
• Activated Charcoal or Molecular Sieves: Specialized desiccants for sensitive or museum-grade applications.

Uses in Art and Framing

• Placed in frames or storage containers to maintain low moisture levels.
• Used in shipping artwork to protect against environmental humidity fluctuations.
• Preventive measure in archival storage, display cases, or exhibition conditions.

Best Practices

• Replace or recharge desiccants periodically to maintain effectiveness.
• Pair desiccants with sealed or partially sealed framing or storage systems.
• Monitor relative humidity in storage areas using hygrometers to optimize protection.
• Avoid direct contact between desiccant packets and artwork surfaces to prevent staining or abrasion.

Related Terms

• Absorbent
• Damp
• Relative Humidity
• Archival Storage