Moreover, in order to avoid formation of gas bubbles due to polymer decomposition, {TAIL ~ the blend} must be extruded at temperatures below {HEAD ~ about 530° F.} and above about 490° F 
Moreover , in order to avoid formation of gas bubbles due to polymer decomposition , { TAIL ~ the blend } must be extruded at temperatures below { HEAD ~ about 530 ° F. } and above about 490 ° F
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH