The amount of burn chemical often ranges from about 1 percent to about 15 percent, {HEAD ~ preferably about 5 to about 10 percent}, based on {TAIL ~ the total weight} of the formulation 
based on
The amount of burn chemical often ranges from about 1 percent to about 15 percent , { HEAD ~ preferably about 5 to about 10 percent } , based on { TAIL ~ the total weight } of the formulation
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH