When clamped between flange surfaces, the edge coating engages, conforms to, and seals against the flange surfaces to provide {HEAD ~ a seal} against {TAIL ~ both interfacial and intersticial migration} of fluid past the gasket 
against
When clamped between flange surfaces , the edge coating engages , conforms to , and seals against the flange surfaces to provide { HEAD ~ a seal } against { TAIL ~ both interfacial and intersticial migration } of fluid past the gasket
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH