Binder technology includes the use of a polymer additive in order to give the asphalt more desirable qualities. Specific binder and mix properties can be engineered by choosing the right polymer for the application, and making sure it is compatible with the asphalt. In general, elastomers are chosen to give a more resilient, flexible pavement, while plastomers result in mixes with higher stabilities and stiffness moduli. The results are highly dependent upon the concentration, the molecular weight, the chemical composition, and the molecular orientation of a particular polymer as well as the crude source, the refining process and the grade of the base asphalt used.