VCI Storage Bags Vs. Desiccant Packs - Arms Preservation Inc

Anti Rust VCI Storage Bags Vs. Desiccants

Let's break down the differences and unique advantages of VCI storage bags  (Vapor Corrosion Inhibitor) and desiccant packs in protecting metal from rust and corrosion:

VCI (Vapor Corrosion Inhibitor):

Mechanism of Protection:

  • How it Works: VCIs emit rust-inhibiting vapors that form a protective layer on the surface of metal parts. This layer displaces moisture and prevents oxygen from coming into contact with the metal surface, thereby inhibiting corrosion.
  • Chemistry: VCI molecules do not alter or leave a residue on metal parts. They work equally well on clean metal surfaces or those with metal finishes.
  • Application: Typically embedded into packaging materials like paper or poly film, VCIs are released when metal parts are wrapped or covered, providing corrosion protection during storage and shipping.
  • Advantages:
    • Effective on both ferrous and non-ferrous metals.
    • No need for cleaning or degreasing upon removal from packaging.
    • Can protect intricate shapes and hard-to-reach areas due to the ability of vapors to diffuse.

Desiccant Packs:

Mechanism of Protection:

  • How it Works: Desiccants are drying agents that adsorb moisture from the surrounding air in an enclosed space. They prevent moisture buildup, which is crucial for preventing corrosion.
  • Types: Common desiccants include silica gel, activated charcoal, bentonite clay, and calcium chloride, which are chosen based on their ability to hold moisture.
  • Application: Desiccants are typically placed within packaging to control humidity levels. They absorb moisture that could otherwise lead to corrosion of metal parts.
  • Advantages:
    • Effective at reducing humidity levels within packaging.
    • Prevents moisture-related corrosion by maintaining dry conditions.
    • Helps in environments where moisture control is critical, such as in humid climates or during shipping across varying temperature conditions.

Integration and Combined Use:

  • Complementary Roles: While VCIs protect metal surfaces directly by forming a barrier against corrosion, desiccants maintain dry conditions within packaging to prevent moisture buildup.
  • Combined Benefits: Using VCI and desiccant together in packaging can provide enhanced protection against corrosion. VCI prevents corrosion directly on metal surfaces, while desiccant ensures that humidity levels remain low, reducing the overall risk of moisture-related damage.

VCI storage bags and desiccant packs serve distinct roles in corrosion prevention. VCI provides fail safe gun rust protection by emitting rust-inhibiting vapors, while desiccant maintains dry conditions by adsorbing moisture from the air. Combining these technologies can provide superior protection against rust and corrosion in diverse packaging and storage environments.


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