The sheet may include a chemically resistant additive to provide chemical resistance to {HEAD ~ at least part} of {TAIL ~ the protective membrane} 
The sheet may include a chemically resistant additive to provide chemical resistance to { HEAD ~ at least part } of { TAIL ~ the protective membrane }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL