Stator compound having an azide cured elastomeric base and stators and downhole motors using the same

A method of making a stator for a progressive cavity pump or progressive cavity motor comprising the steps of:

• forming a masterbatch comprising at least one elastomeric component, at least one reinforcing filler and a triphenyl phosphate plasticizer, the at least one elastomeric component being selected from the group consisting of HNBR, NBR, FKM, CR, EPDM, and ECO and combinations thereof;
• heating, mixing, or blending the masterbatch until the masterbatch reaches a first predetermined temperature;
• cooling the masterbatch to a second predetermined temperature;
• forming a final pass batch comprising the masterbatch and a first curing agent that is a diazide;
• and
• curing the final pass batch by heating, mixing, or blending the final pass batch until the final pass batch reaches a third predetermined temperature.