Apparatus for controlling the relative humidity in a substantially closed container

摘要

An insert 10 for inclusion in a substantially sealed container to control the relative humidity within the container is provided. The inset is a packet at least part of the surface of which is a membrane 13 capable of passing water vapor and which contains a buffering substance 14 which is a saturated salt solution selected according to the desired relative humidity, and modified by a nonelectrolyte, if necessary, to adjust the relative humidity.