... metal aluminum, PVC, PVC sheets), college, university and quality institution for gas(O2,CO2,N2,ect)permeation test and quality control. Standards ... it. Then do the vacuum for the whole system .Close the lower testing chamber, input test gas in the upper chamber, make ... areaΦ80mm, transmission area 50.24cm2,(no stipulate for area in international)Gas Pressure0.2-0.8MpaPower supplyAC220 V/50Hz Software ...