said proportion includes a proportion in {HEAD ~ the range} of {TAIL ~ 15% glass} and talc 
of
said proportion includes a proportion in { HEAD ~ the range } of { TAIL ~ 15 % glass } and talc
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH