Penetration grade bitumen supplied by GLB is pure petroleum grade bitumen, manufactured from vacuum bottom by passing hot air. The bitumen supplied by GLB is produced from remain of crude oil after cracking and removing hydrocarbon. Penetration grade bitumen 80/100 has penetration between 80~100 desi-millimeter and softening point between 48 ~ 56C. The penetration grade bitumen 80/100 has a thermoplastic property which is like as synthetic resin material which gets softer with heating and hardens when cooled. This grade of bitumen 80/100 has very strong viscosity compare to other grades.