Performance bitumen

Another packaging is tar according to the performance  grade (PG) , recognition of bitumen behaviors and practical characteristics which  are primary steps , the consumer shall select a bitumen according to relevant temperature scopes , it means the higher temperature ,the higher performance  indeed the part one should by greater range ,while the part two should be the least in the cold area .

One of privileges of grading system is functional criteria, thus that grading is very dedicated and precision, therefore the variables are within 6-degree scope, it means every 6-degree change displays better performance, moreover the least PG demonstrates the lower practical degree against one-degree change and overlap between grades, actually.there are tests and specifications for corrected and uncorrected tars.