In most European countries, Bulk Supplies are available over the whole range of penetration grades. In many third countries, only one grade is available for Bulk delivery which have more wax content i.e. 100 pen grade.

The consistency of bitumen is defined by means of two tests the penetration test & the softening point test. In practice the different grade are designed by their penetration. With increasing pen value during oxidation process was content in the bitumen reduces so that clastic componer properties increase which behaves like rubber by that way deformation under road is increase.