{HEAD ~ The method} 1 wherein {TAIL ~ the fluorocarbon constituent} A of the blowing agent mixture is octafluorocyclobutane 
wherein
{ HEAD ~ The method } 1 wherein { TAIL ~ the fluorocarbon constituent } A of the blowing agent mixture is octafluorocyclobutane
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH