When using the dense plastics material, for example in {HEAD ~ the form} of {TAIL ~ a thin plastic film} or the like, there is, by contrast, no appreciable thermal insulation capacity 
of
When using the dense plastics material , for example in { HEAD ~ the form } of { TAIL ~ a thin plastic film } or the like , there is , by contrast , no appreciable thermal insulation capacity
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH