These can be incorporated into the PVC material for the second region with the necessary uniform distribution and in the necessary amount either during {TAIL ~ the preparation} of {HEAD ~ the material} or by subsequent compounding therewith 
These can be incorporated into the PVC material for the second region with the necessary uniform distribution and in the necessary amount either during { TAIL ~ the preparation } of { HEAD ~ the material } or by subsequent compounding therewith
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH