Emitters represents a breakthrough solution in corrosion prevention. VpCI® compounds diffuse into the air and bond to any metal surface. The coverage is complete – all surfaces, crevices, cavities, and other inaccessible void areas receive total protection. The VpCI® barrier is self-replenishing, even for packaging that’s repeatedly opened, and typically protects for up to 24 months. As pictured, the emitters typically come in either puck-shaped containers or as 0.25" thick foam pieces.