Optionally, an additive such as {HEAD ~ an alkyl substituted aromatic sulfonic acid} can be added to {TAIL ~ the composition} to further improve the asphalt properties 
Optionally , an additive such as { HEAD ~ an alkyl substituted aromatic sulfonic acid } can be added to { TAIL ~ the composition } to further improve the asphalt properties
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH