Rail Insulator

rail insulator

  • Size: all types avaliable
  • Standard: UIC, GB, DIN, AREMA/ASTM, BS, JIS etc
  • Surface: according to client
  • Packing: Double-layer woven bag + Free fumigation wooden pallet or according to clients
Rail insulator, also called railroad insulator, rail insulation, rail nylon insulator, it is installed between steel rail and tie plate, for adjusting rail gauge and electrically insulating railroad rails, rail clips and rail bolts from the interior of a concrete sleeper. Its function is the same as a rail pad, but it is thicker than rail pad. For the high speed or high load train, it is a necessary rail fastener .

Properties of rail insulators

The insulators apply to rails such as 60kg (UIC) rail, 52kg rail, 136RE Rail, 90R, 75R, 50R, 60R etc. The rail insulator is mainly made by injection molding production, and it is mainly composed of Nylon-6 or Nylon-66 with glass filler content 20% to 35% depending on specification. These material are UV stabilized and available in natural color or as per requirement.

The properties of our rail insulators are as follows:

Technical Parameter Unit Technical Requirement Value
Density g/cm 1.3-1.45 1.45
Tensile Strength Mpa ≥170 178
Elongation % ≤4.4 4.0
Bending Strength Mpa ≥250 290
Impact Strength (No gap) KJ/m2 ≥80 85
Melting Point 250 – 270 270
Insulation Resistance Ω ≥1×108 5×108
Glass Fiber Content % 30-35 35
Hardness HRR ≥110 118

Types of rail insulators

We supply E-type rail insulators and guide plates for SKL rail fastening systems and Nabla fastening systems. The material of rail insulator is usually Reinforced Nylon 66 (PA66), with the color white, dark brown or black. Materials and colors can also be customized according to the customers’ requirements.

E-type rail insulators are used in E-clip fastening systems, together with E-clips, rail shoulders and rail pads, whose function is to cushion the passing train’s stress onto the rail and make the rail back to position afterwards, similarly used as a rail pad under the rail track.


e type rail insulatore type insulator

SKL rail insulators

Nabla rail insulators

Nabla rail insulators are used in Nabla clip rail fastening systems, working together with other fastener parts including Nabla clips, screw spikes and spring washers.

nablainsulatornabla rail insulators