Description of Bitumen 60/70 Bitumen 60/70 is one of the most widely used penetration-grade bitumen grades, which has an excellent compromise between hardness and flexibility. It is produced by air-blowing vacuum bottom residues in the refinery and has a penetration value of 60 to 70 deci-millimeters (dmm) according to the ASTM D946M standard. Owing to […]
