... :13, 25, 47, 50, 90, 100mm SPECIFICATION: 1.MATERIAL: PTFE (Polyether Polytetrafluoroethylene) 2.PORE SIZE: 0.1um, 0.20um ... also available, please refer to our showroom. FEATURES: 1. PTFE membrane adopts 100% natural and permanent hydrophobic membrane material ... against hydrophilic membrane APPLICATIONS: 1. Filtration for air, gas and hydrophobic chemicals 2. PTFE membrane possesses extremely strong ...