1.1 This specification covers thermoplastic polyester materials suitable for molding or extrusion. 1.2 This specification allows for the use of recycled thermoplastic polyester materials provided that the requirements as This specification is intended to provide a callout system for thermoplastic polyester (TPES) injection and extrusion materials, both virgin and recycled, based on ISO test methods. However, the proportions of recycled material used, and the nature and