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