The Bitumen mode is dependent on temperature. The temperature and stiffness of bitumen is dependent on the type of crude oil and its refining method. Bitumen penetration grade 60/70 with the highest viscosity is known to semi hard penetration grade ,specially used for asphalt production .Generally used In covering application and In producing hot mix asphalt . Bitumen 60/70 is one of the most used bitumen grades and it’s a basic material for all other bituminous products. Penetration grade bitumen 60-70 could reach a softening point in 48-52C with the highest penetration ,60 to 70 desi-millimeter . This grade is a thermoplastic property that have a reaction alike synthetic resin which gets softer with heating and hardens when cooled. Because of its low, strong viscosity its a convenient product for hot weather conditions .