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