Specification of bitumen penetration grade 160/220BAKHTAR BITUMEN Bitumen 160/220Test methodUnitSpecificationPenetration @ 25°cIP 49mm/10160/220Softening point °cIP 58°C35/43Kinematic Viscosity @ 135 °CIP 370mm2/s135 minFlashpoint °cIP 36°C220 minSolubility is CS2(wt) %IP 47wt %99 min