Comparison of chemical permeation data obtained with ASTM and ISO permeation test cells--II. The ISO/DIS standard test procedure.

ASTM and ISO/DIS test cells were used for permeation testing according to the procedure proposed in draft international standard ISO/DIS 6259. Two compounds, toluene and 1,1,1-trichloroethane, were tested with one neoprene glove and one made of a specially prepared Neoprene material. Different open-loop systems, direct-flow measurement and a sampling system with different gas flow rates were compared, and the effects on the test result were evaluated. The initial breakthrough (BTT) times and cumulative breakthrough times (lag-BTT) were significantly influenced only by the measurement systems. Neither cell configuration nor changes in the gas flow rate influenced them to any degree relevant for comparison of the test values on a relative basis in most cases. The permeation rates (PER) and the cumulative amount permeating per cm2 in 60 min showed significant differences between measuring systems, gas flow rates and the ASTM vs the ISO/DIS test procedures.