For instance, the powder or powder blend may include a water swellable powder for blocking the migration of {HEAD ~ water} along the assembly for effectively blocking the migration of {TAIL ~ water} 
For instance , the powder or powder blend may include a water swellable powder for blocking the migration of { HEAD ~ water } along the assembly for effectively blocking the migration of { TAIL ~ water }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL