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