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Chemical permeation measurements were made for six chemical/polymer systems using the 51-mm (2-in.) ASTM cell and the smaller version of the cell (25 mm [1 in.]), and the results were compared. An open loop system with gas flow rates of 1000 mL/min (33.8 fl oz/min) (ASTM cell) and 250 mL/min (8.45 fl oz/min) [25 mm (1 in.) cell] was used to determine the breakthrough times and steady-state permeation rates. For each material/chemical pair, at least four experiments were conducted in each cell. The 25-mm (1-in.) cell, compared with the ASTM cell, showed a longer breakthrough time and a lower permeation rate. However, statistical treatment of the results demonstrated that the variation of break-through times and permeation rates between the two cells was insignificant and that the two cells were equivalent.
chemical protective clothing, permeation rate, breakthrough time, ASTM permeation cell, equivalency
Professor, Tuskegee University, AL