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iglidur® RW370 – material data
The most important specifications at a glance
Fire-retardant, fulfils DIN EN 45545 HL3, R22/R23
iglidur RW370 was specially developed for the high fire protection requirements in railway technology. It therefore fulfils the requirements of DIN EN 45545. Plain bearings from iglidur RW370 are used in railway technology, primarily in door systems, seat adjusters and hinges.
| Descriptive technical specifications | ||
|---|---|---|
| Wear resistance at +23°C | - 🟧 🟧 🟧 ⬜️ ⬜️ + | More information on wear resistance |
| Wear resistance at +90°C | - 🟧 🟧 🟧 ⬜️ ⬜️ + | |
| Wear resistance at +150°C | - 🟧 🟧 🟧 ⬜️ ⬜️ + | |
| Slide property | - 🟧 🟧 🟧 🟧 ⬜️ + | Coefficient of friction, dynamic, against steel: µ 0.13 - 0.17 |
| Wear resistance under water | - 🟧 🟧 ⬜️ ⬜️ ⬜️ + | |
| Media resistance | - 🟧 🟧 🟧 ⬜️ ⬜️ + | More information on media resistance |
| Resistant to edge pressures | - 🟧 🟧 🟧 🟧 ⬜️ + | |
| Resistant to shock and impact loads | - 🟧 🟧 🟧 🟧 ⬜️ + | |
| Dirt resistance | - 🟧 🟧 🟧 ⬜️ ⬜️ + |
Temperature
The maximum permissible short-term temperature is +190°C, which means that iglidur RW370 plain bearings can also be used in all applications with increased ambient temperatures. The compressive strength of iglidur RW370 plain bearings decreases with increasing temperatures. When considering temperature, the additional frictional heat in the bearing system must be taken into account. At temperatures above +120°C, additional protection is required.
Temperatures, coefficient of thermal expansion
| min. application temperature | Upper application temperature, long-term | Upper application temperature, short-term | In addition secure axially from |
|---|---|---|---|
| -50°C | +170°C | +190°C | +120°C |
Permissible surface speeds
Even if the typical application areas for iglidur RW370 plain bearings are more likely to be seen in intermittent operation, the maximum achievable speeds are still considerable depending on the type of movement. The speeds given in the table are limit values for the lowest bearing loads. At higher loads, the permissible speed decreases with the load due to the limitations of the pv value.
Surface speeds of various iglidur materials
| Maximum surface speeds [m/s] | Rotating | Oscillating | linear |
|---|---|---|---|
| Long-term | 0.9 | 0.6 | 2.5 |
| Short-term | 1.0 | 0.8 | 2.6 |
Permissible pv values
Diagram 01: Permissible pv values for iglidur RW370 plain bearings with 1mm wall thickness in dry operation against a steel shaft, at +20°C, installed in a steel housing.
X-axis = surface speed [m/s]
Y-axis = pressure [MPa]
Mechanical specifications
The compressive strength of iglidur RW370 plain bearings decreases with increasing temperatures. Diagram 02 illustrates this relationship. The maximum recommended surface pressure represents a mechanical material parameter. Conclusions about the tribology cannot be drawn from this. Diagram 03 shows the elastic deformation of iglidur RW370 under radial load. Possible plastic deformation depends, among other things, on the duration of the duty cycle.
Friction and wear
Diagram 04: Coefficients of friction as a function of the surface speed, p = 1MPa
X = surface speed [m/s]
Y = coefficient of friction μ
The very good coefficient of friction of iglidur RW370 in dry operation decreases even further with speed up to a value of 1.1m/s. Diagram 04 shows this relationship on a steel shaft. From a speed of 1.25m/s, however, the coefficient of friction rises sharply as the load limit of the material is reached.
Coefficient of friction against steel (Ra = 1μm, 50HRC):
| iglidur RW370 | dry | Greases | Oil | Water |
|---|---|---|---|---|
| Coefficient of friction μ | 0.13 - 0.17 | 0.09 | 0.04 | 0.04 |
Shaft materials
Diagrams 06 and 07 show an extension of the results of tests with different shaft materials, which were carried out with plain bearings from iglidur RW370. At 0.3m/s and 1MPa surface pressure, shafts made of hard anodised aluminium and hard chrome-plated Cf53 are the most suitable mating surfaces. Shafts made of 304 stainless steel or high grade steel also deliver good results. If your intended shaft material is not included in the test results presented here, please contact us.
Chemical resistance
All data at room temperature [+20 °C], + resistant 0 conditionally resistant - non-resistant
| Chemicals | Resistance |
|---|---|
| Alcohols | + up to 0 |
| Greases, oils without additives | + |
| Hydrocarbons | - |
| Fuels | + up to 0 |
| Strong alkalines | - |
| Strong acids | - |
| Diluted alkalines | + |
| Diluted acids | + |
Installation tolerances
iglidur RW370 plain bearings are standard bearings for shafts with h-tolerance (recommended minimum h9). The bearings are designed for press-fit into a housing machined to a H7 tolerance. After installation in a housing with nominal dimensions, the inner diameter of the bearings with F10 tolerance adjusts automatically. For certain dimensions, the tolerance deviates from this depending on the wall thickness (see product range).
Important tolerances according to ISO 3547-1 after press-fit:
| Diameter d1 [mm] | Housing H7 [mm] | iglidur RW370 plain bearing F10 [mm] | Shaft h9 [mm] |
|---|---|---|---|
| up to 3 | +0.000 +0.010 | +0.006 +0.046 | -0.025 +0.000 |
| > 3 up to 6 | +0.000 +0.012 | +0.010 +0.058 | -0.030 +0.000 |
| > 6 up to 10 | +0.000 +0.015 | +0.013 +0.071 | -0.036 +0.000 |
| > 10 up to 18 | +0.000 +0.018 | +0.016 +0.086 | -0.043 +0.000 |
| > 18 up to 30 | +0.000 +0.021 | +0.020 +0.104 | -0.052 +0.000 |
| > 30 up to 50 | +0.000 +0.025 | +0.025 +0.125 | -0.062 +0.000 |
| >50 to 80 | +0.000 +0.030 | +0.030 +0.150 | -0.074 +0.000 |
| >80 to 120 | +0.000 +0.035 | +0.036 +0.176 | -0.087 +0.000 |
| > 120 up to 180 | +0.000 +0.040 | +0.043 +0.203 | +0.000 +0.100 |
Buy iglidur RW370 products in the online shop
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- No minimum order value
- No minimum order quantity
Typical application areas
Door guides and hinges, rotating joints, access steps, seat and table mechanisms
Consulting
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