
What is Penetration Grade 60/70 So the penetration grade represents the depth (in tenths of a millimeter) to which a standard needle penetrates the bitumen sample under specified conditions. In the case of Bitumen 60/70, the penetration value is between 60 and 70 at 25°C. Characteristics Penetration Grade 60/70 Bitumen 60/70 is relatively hard due to its medium penetration grade….