In order to avoid contamination of the product in this case, the selection of possible construction materials, in particular for {HEAD ~ regions} exposed to {TAIL ~ very high temperatures}, is very limited 
In order to avoid contamination of the product in this case , the selection of possible construction materials , in particular for { HEAD ~ regions } exposed to { TAIL ~ very high temperatures } , is very limited
OTH 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 REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH