All parts, {HEAD ~ percentages} and {TAIL ~ ratios} used herein are expressed by weight unless otherwise specified 
All parts , { HEAD ~ percentages } and { TAIL ~ ratios } used herein are expressed by weight unless otherwise specified
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH