Bitumen 60/70
What is Bitumen 60/70 Bitumen 60/70 means penetration of bitumen is between 60 to 70 and compare bitumen 80/100 which means penetration is between 80 to 100 is harder since needle penetrating less.This grade of bitumen is made by blowing of hot air to vacuum bottom and penetration between 160 to 220 which is very soft …