This part of IEC 61788 specifies the test method and procedures for testing tensile mechanical properties of REBCO superconductive composite tapes at room temperature. This test is used to measure the modulus of elasticity and 0@2 % proof strength. The values for elastic limit@ fracture strength and percentage elongation after fracture serve only as a reference. This document applies to samples having a rectangular cross-section with an area of 0@12 mm2 to 6@0 mm2 (corresponding to the tapes with width of 2@0 mm to 12@0 mm and thickness of 0@06 mm to 0@5 mm).