As long as the 40% indicator is blue, no corrosion is taking place. Applications include plant and equipment stored in uncontrolled conditions or spare/components that are held in stock for extended periods of time.
LewisBins+: LewisBins+: Humidity indicator
Shield Pack (Monroe, LA) incorporates a humidity indicator into its range of custom fitted barrier foil shrouds and liners. The clock-style device monitors the relative humidity inside the barrier bag and allows contents to be monitored during storage.