An usable area of breaking strength property is an important basis to make the right choice of technology solution and materials for producing X-ray shield membranes, which are used for protective apron. In this work, Chinese lead aprons with lead equivalent thickness of 0.25
0.35 and 0.5 mmPb were used for studying their mechanical properties. The physical properties of X-ray shield membranes including breaking strength, breaking elongation and E-modul in both longitudinal and horizontal directions of the aprons were investigated. The obtained results revealed that X-ray shield membranes with the lead equivalent thickness ranging of 0.25-0.5 mmPb coupled with geometry thickness of 0.72-1.42 mm can achieve the E-modulus of about 40.2-146.2 MPa, the breaking strength varied from 5.0 to 15.9 MPa, and breaking elongation approximate of 200.6-309.8 percent in longitudinal direction, while, the range of properties is following 67.6-155.5 MPa for E-modul, 4.1-12.6 MPa for breaking strength and 211.2-320.8 percent for breaking elongation, respectively in horizontal direction.