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