VpCI 609 biodegradable powder is a water-soluble, vapor-phase corrosion inhibitor powder for wet or dry corrosion protection of ferrous metals and aluminum. The powder creates a monomolecular inhibiting layer on the metal surface, providing protection for up to 24 continuous months. It does not contain nitrites or phosphates and can be applied in dry form by dusting, fogging or sprinkling. It can be applied in liquid form by spray, brush, flush, or immersion. Fogging is achieved by using a low-pressure air hose and sandblast cup. Large conventional sandblasting systems can also be used. The powder should be used at a rate of 0.3 to 0.5 ounce per cubic foot of enclosed space. The dosage can be increased for severe conditions.