VpCI-101 devices are designed to provide corrosion protection for metal components and parts enclosed in non-ventilated control boxes, cabinets, or tool boxes. A VpCI-101 device protects up to 1 cubic foot (28 liters) in volume. VpCI-101 is a small patented device from which Vapor phase Corrosion Inhibitors (VpCIs) are slowly released. The VpCIs emit vapors that form a molecular layer on metal surfaces to protect critical, complex, and expensive electronic equipment and other metal components during operations, shipping, or storage. VpCI-101 provides long-term protection against corrosion even in the presence of adverse conditions including salt, moisture, airborne contaminants, H2S, SO2, NH3, and others.