A press block is engaged against the gasket to fully enclose {HEAD ~ an active volume} between the press block, {TAIL ~ the peripheral walls} of the central opening in the gasket, and the active surface of the substrate 
between
A press block is engaged against the gasket to fully enclose { HEAD ~ an active volume } between the press block , { TAIL ~ the peripheral walls } of the central opening in the gasket , and the active surface of the substrate
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH