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