Looks like a fibrous, the role of self-supporting film. It is an asymmetric membrane, the dense layer at the outer surface of th Looks like a fibrous, the role of self-supporting film. It is an asymmetric membrane, the dense layer at the outer surface of th ( function(){ var aBigImageSrc = [ 'http://i01.i.aliimg.com/photo/v0/309036027_1/Hollow_Fiber_Water_Treatment_System.jpg' , 'http://i01.i. ...