Gas Sampling Bags are widely used in petroleum chemical industry,environmental monitoring,science experiments,etc.for gas samples collection and preservation.Now,the common gas sampling bags are total of six categories:Aluminium-plastic（multi-layer） Gas Sampling Bags,DEVEX Gas Sampling Bags,Tedlar PVF Gas Sampling Bags,Kynar PVDF Gas Sampling Bags,Fluode Gas Sampling Bags,FEP（Teflon）gas sampling bags.