NYLON HVN LINER

High Viscous Nylon-66 (HVN) liners are specialized insulating components used in railway tracks for fastening systems, designed to replace Glass-Filled Nylon (GFN-66) liners. They offer superior impact resistance, higher durability, and better moisture resistance (less hygroscopic), reducing corrosion on rail foot and breakages during maintenance. Indian Railway Institute of Civil EngineeringIndian Railway Institute of Civil EngineeringKey Features of HVN LinersMaterial: High Viscous Nylon-66, which is more durable than traditional GFN-66.Viscosity: The material has a minimum viscosity number of , ensuring higher performance.Durability: They rarely break in the track, whereas GFN liners are prone to breakage.Corrosion Resistance: Less hygroscopic material reduces moisture absorption, protecting the rail foot from corrosion.Color Coding: Generally features UV-stabilized RAL colors (e.g., Brown Red 3011, Mint Green 6029) instead of screen-printed colors.Standardization: Used to meet RDSO specifications (T-44-2023) for modernization of railway trackCommon Types and ApplicationsCommonly used with 60kg rails for improved insulation and safety in railway track assemblies, according to AIL Plastics and TendersOnTime: AIL PlasticsAIL PlasticsRT-3702, RT-3706, RT-6937, RT-8751: (Brown Red)RT-3707, RT-6938, RT-8752: (Mint Green)RT-3708, RT-6939, RT-8753: (Cobalt Blue) These liners require strict quality control, including a memorandum of understanding (MOU) between the manufacturer and the primary raw material supplier, says this RDSO document