haprumine, mis on tingitud vesinikuaatomite kogunemisest ja vesinikumolekulide rekombinatsioonist (vt haprumine, vesinikhaprus, keskkonnavesinikhaprumine, sisemine vesinikhaprumine), embrittlement or hydrogen-induced cracking in metals resulting from the presence of hydrogen atoms (see: embrittlement, environmental hydrogen embrittlement, internal hydrogen embrittlement, hydrogen britlleness)