N500 Gas permeation tests the gas transmission rate (GTR) of packaging material,Is widely used in food industry, pharmaceutical industry, flexible packaging materials industry (plastic film, barrier materials, sheets, metal aluminum,PVC sheets), university and quality institution for gas(O2,CO2,N2,etc)permeation test and quality control.                                                                                                                                                                                                                                                                                                                                                                                            
It carries the standards of ISO 2556-2001,ISO15105-1,GB/T 1038-2000,ASTM D1434-82(2003),YBB00082003.