VG-40 bitumen is anew revision of bitumen that is different with the penetration ones. It is called viscosity grade that improved from the last ones.
Bitumen VG-40 is a new revision of bitumen that is different with the penetration ones. It is called viscosity grade that improved from the last ones.
VG-40 BITUMEN is a new revision of bitumen that is different with the penetration ones. It is called viscosity grade that improved from the last ones.
