Bitumen Penetration 40-50 is pure petroleum grade bitumen, manufactured from vacuum bottom by passing hot air. The bitumen supplied by PUB-LTD is produced from remain of crude oil after cracking and removing hydrocarbon. Penetration grade bitumen 30/40 has penetration between 40~50 desi-millimeter and softening point between 52 ~ 60C. The penetration grade bitumen 30/40 has a thermoplastic property which is like as synthetic resin material which gets softer with heating and hardens when cooled.