The rate of hardening, or polymerization, of adhesive can be controlled by varying the concentration of {HEAD ~ catalyst} in {TAIL ~ the catalyst solution} 
in
The rate of hardening , or polymerization , of adhesive can be controlled by varying the concentration of { HEAD ~ catalyst } in { TAIL ~ the catalyst solution }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL