As {TAIL ~ the activated carbon}, a phenol type, {HEAD ~ a rayon type}, an acryl type, a pitch type or a coconut shell type may be used 
As
As { TAIL ~ the activated carbon } , a phenol type , { HEAD ~ a rayon type } , an acryl type , a pitch type or a coconut shell type may be used
REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH