... steel strip (Fezn);The inner layer: flame-retardant anti-corrosion insulation layer. Trial: Trial in dry places and ... of low-voltage electrical piping. Characteristics:flexible, water-resistant, anti-corrosion, fire-retardant, insulation, security. Advantages: 1. good ... 1. Use basic accessory tube. 2. Flame retardant anti-corrosion insulation layer non-toxic, harmless, environmental protection and ...