While performing the role of a TA for Metals and Plastics Lab (Pack 211), Water Vapor Transmission Rate (WVTR) Testing based off of ASTM D3079-94 was performed. After data was collected, calculations were performed and graphs were plotted in Excel. A PowerPoint presentation was made to explain WVTR, why WVTR is tested, the ASTM test procedure, how data was collected, the data collected, and comparisons between the data collected and published data.