Anh
Hardness Factor
Hardness Index
Đức
Haertefaktor
Pháp
hardness factor
indice de dureté
hardness factor,indice de dureté /ENERGY-MINING,INDUSTRY-METAL/
[DE] Haertefaktor; Hardness Factor
[EN] Hardness Factor; Hardness Index
[FR] hardness factor; indice de dureté