The porous substrate is impregnated with a polymeric material capable of bonding to {HEAD ~ the insulation} of {TAIL ~ the conductors} 
of
The porous substrate is impregnated with a polymeric material capable of bonding to { HEAD ~ the insulation } of { TAIL ~ the conductors }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL