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