PermeGear’s Diffusion System is an apparatus employing Franz Cells for carrying out in vitro release testing (IVRT) and in vitro permeation testing (IVPT). The system enables to measure the release or permeation of a compound into or through membranes. Franz Cells are used in the development of transdermal applications and for studying permeation into and through mucosal tissues. It is a static versatile blown glass diffusion cell which locates the membrane horizontally and is usually used in the development of transdermal products having a donor chamber open to the air and a stirred receptor chamber.