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