... .good stiffness, 3.no binder, no smell, 4.Apply for HEPA, PTFE Air Purifier Media - Non Woven Supporting Layer Filter Fineness ... : 5 umEfficiency: 97%Application: home air purifier system, HEPA media, PTFE membrane. etcTechnical data of YMD80HG: SquArticleUnitTDS1Grammageg/m280±52Thicknessmm0 ...