PERMATRAN-C® 4/40 4/40 is a carbon dioxide (CO2) transmission rate test system for assessing barrier films and package materials. The PERMATRAN-C 4/40 is ideally suited for rapidly predicting product shelf-life, or checking the quality of incoming and outgoing package materials. These results aid in package development and prevent costly over packaging. The PERMATRAN-C 4/40's perform tests directly at "real world" temperature and CO2 levels. The system's transmission rate software will control up to 20 test cells in a system. In addition, the software reduces the possibility of errors with its ability to automatically determine equilibrium and compensate for any flow changes. Pre-programmed test formats, computer, and menu-driven screens make it easy to generate and interpret data test data. Like all MOCON permeation test systems, the PERMATRAN-C 4/40 is modular. A flexible, dual film test cell configuration and optional Package Environmental Chamber allows for testing both flat films and finished packages.