The hydrogen permeable material exhibits excellent hydrogen permeability as well as excellent resistance to {HEAD ~ embrittlement} caused by {TAIL ~ the permeation} of hydrogen 
caused by
The hydrogen permeable material exhibits excellent hydrogen permeability as well as excellent resistance to { HEAD ~ embrittlement } caused by { TAIL ~ the permeation } of hydrogen
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 OTH OTH