Railko
Railko's NF21 and NF22 bearing materials are non-metallic composites which have been specially designed to cope with extreme operating conditions such as high loads, speeds, temperature fluctuations and dirty conditions.
Depending on the application and grade, these thermosetting resin laminates can operate dry, partially lubricated or fully lubricated in oil or seawater.
Railko's marine bearings are approved by all major marine classifications and Navies worldwide.
They offer significant advantages in terms of reduced maintenance, improved reliability and life of the shaft material.
Applications include
- Propeller shaft bearings
- Rudder bearings
- Steering gear and deck
- Machinery bushes in both surface and submarine vessels
Tests carried out in sand laden seawater show that Railko NF grades offer greater wear resistance than alternative materials. In addition to this they provide smoother running, reduced noise and prevent stick slip.
Properties
| Property |
Unit of measure |
Value |
| Tensile Strength | Mpa | |
| Elongation at Break | % | |
| Modulus of Elasticity | MPa | |
| Impact Strength | kj/m² | |
| Compressive Strength | MPa | 220 |
| Shear Strength | MPa | 41 |
| Shore Hardness | D Scale | |
| Co-efficient of Friction | μ | |
| Water Absorption @ 23 Deg C | % | <1 |
| Service Temperature Intermittent | ᵒC | |
| Service Temperature Continuous | ᵒC | 120 |
| Melting point | ᵒC | |
| Thermal Conductivity | W/m.ᵒC | |
| Dielectric Strength | kV/mm | |
| Volume Resistivity | Ω.cm | |
| Surface Resistivity | Ω | |
| Arc Resistance | Sec | |