Abstract: In order to improve the application process of cryogenic adsorbent in cryogenic insulated cylinders,a new method of sealed packaging of low temperature adsorbent molecular sieve was introduced by using polymer non-woven fabric.This will eliminate the activation process of adsorbent before loading,reduce the process cost and energy consumption,and help to improve the performance of adsorbent.In this paper,whether the selected polymer non-woven material can pollute the vacuum interlayer of cryogenic insulated cylinder was studied.The equipment,test steps and test results of the material outgassing test for polymer nonwoven fabrics are also introduced.Experiments show that the outgassing rate of polymer nonwovens is much lower than that of multi-layer insulation materials,so the influence on the vacuum interlayer of cryogenic insulated cylinder can be neglected.