Graph of Permeation Rate Permeation Rate Chemical /min / cm 2 Test 2.0 Permeati Volume ng “Breakth Permeate FIRST rough” for 180M 1.5 “Breakthr 300 M d ough” At 1.0 120M “Breakthr ough” 0.5 60 120 180 240 300 360 420 480 Time