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