Infrared radiation gives the best results, leading to {HEAD ~ shorter heating time} without {TAIL ~ material degradation} 
without
Infrared radiation gives the best results , leading to { HEAD ~ shorter heating time } without { TAIL ~ material degradation }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL