CORTEC'S VpCl 609 biodegradable powder is a water-soluble vapor phase corrosion inhibitor powder for wet or dry corrosion protection of ferrous metals and aluminum. VpCl creates a monomolecular inhibiting layer on the metal surface, providing protection for up to 24 continuous months and does not contain nitrites or phosphates. It can be applied in dry form by dusting, fogging, or sprinkling. It can be applied in aqueous form by spray, brush, flush, or immersion. After application, cover and seal the interior cavity.