... PVC sheets), college, university and quality institution for gas(O2,CO2,N2,ect)permeation test and quality ... sure form constant pressure between the two side of test sample, for differential conditions, the gas will permeate ... 600000 cm3/m2 .day.0.1Mpa(by use expansion the mode)Measuring accuracy0.01cm3/m2.day ... 80mm, transmission area 50.24cm2,(no stipulate for area in international)Gas Pressure0.2-0. ...