The material is chosen so that {HEAD ~ the dissolution} of {TAIL ~ the binder} occurs at the desired rate 
The material is chosen so that { HEAD ~ the dissolution } of { TAIL ~ the binder } occurs at the desired rate
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH