At least a portion of the member is in {HEAD ~ thermal contact} with the opening and is made of {TAIL ~ a material reactive} with electromagnetic energy 
At least a portion of the member is in { HEAD ~ thermal contact } with the opening and is made of { TAIL ~ a material reactive } with electromagnetic energy
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH