... Long working Pantograph strips :1.Specification: five grade for your reference: GradeDensityg/cm²ResistivityuΩ·m HR/10HRB5 ... will depend on material and condition of the third rail (steel, stainless-steel, )and the use, at ... or steel which will damage the patina and rail. Changsha Aobo Carbon Co.,Ltd (former Zhuzhou Tianfeng ... Pantograph strips ,e-carbon , Pantograph strips for light rail and heavy ...