An untreated fabric is subjected to a sequential process which provides {TAIL ~ uniform permeability} and {HEAD ~ greater flexibility} and acid resistance to the treated fabric 
An untreated fabric is subjected to a sequential process which provides { TAIL ~ uniform permeability } and { HEAD ~ greater flexibility } and acid resistance to the treated fabric
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH