一割就开，一扯就断！银巴铁路桥梁用橡胶材料被曝“以次充好”

Core Viewpoint - Recent investigations revealed potential quality issues with rubber materials used in the construction of the Yinba Railway, specifically concerning the inferior quality of ethylene propylene diene monomer (EPDM) rubber sheets, which could pose safety risks and affect the longevity of bridge structures [1][6][18]. Group 1: Quality Issues - Investigative reports indicated that the EPDM rubber sheets could be easily cut and torn, with laboratory tests showing a tensile strength of only 1.78 MPa, which is merely 15% of the required standard of ≥12 MPa [6][9][18]. - The materials tested were found to be primarily made of isoprene rubber rather than the specified EPDM, raising concerns about their durability and performance under harsh conditions [9][18]. - The presence of rough edges and irregularities in the rubber sheets suggested that they may not meet the quality standards expected for EPDM products [9][18]. Group 2: Regulatory Response - The National Railway Administration responded to media reports by forming an investigation team to verify the claims regarding the substandard rubber materials used in the railway project [1][18]. - The project manager from China Railway 16th Bureau expressed a lack of understanding regarding the material properties and stated that they relied solely on inspection reports to accept the materials [10][15][18]. Group 3: Financial Impact - Following the news of the quality issues, shares of China Railway Construction Corporation (601186.SH) experienced a slight decline, closing at 7.97 yuan, with a year-to-date drop exceeding 10%, resulting in a total market capitalization of 108.2 billion yuan [4].