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iglidur® X6 - material data
The most important specifications at a glance
With respect to its general mechanical and thermal specifications, iglidur X6 is directly comparable to our high-temperature classic, iglidur X, and may even provide advantages, such as its wear behaviour.
| Descriptive technical specifications | ||
|---|---|---|
| Wear resistance at +23°C | - 🟧 🟧 🟧 ⬜️ ⬜️ + | |
| Wear resistance at +90°C | - 🟧 🟧 🟧 🟧 ⬜️ + | |
| Wear resistance at +150°C | - 🟧 🟧 🟧 🟧 🟧 + | |
| Slide property | - 🟧 🟧 🟧 ⬜️ ⬜️ + | Coefficient of friction, dynamic, against steel: µ 0.09 - 0.25 |
| Wear resistance under water | - 🟧 🟧 🟧 🟧 ⬜️ + | |
| Media resistance | - 🟧 🟧 🟧 🟧 🟧 + | |
| Resistant to edge pressures | - 🟧 🟧 🟧 ⬜️ ⬜️ + | |
| Resistant to shock and impact loads | - 🟧 🟧 🟧 ⬜️ ⬜️ + | |
| Dirt resistance | - 🟧 🟧 ⬜️ ⬜️ ⬜️ + |
Temperatures
The ambient temperatures have a strong influence on the specifications of plain bearings. In terms of temperature resistance, iglidur X6 occupies a leading position among the iglidur materials. In many tests, a wear resistance six times higher than that of the established "high-temperature specialist" iglidur X was determined. iglidur X6 bearings only require an additional locating spigot at temperatures above +165°C.
Further information on temperature
| min. application temperature | Upper application temperature, long-term | Upper application temperature, short-term | In addition secure axially from |
|---|---|---|---|
| -100°C | +250°C | +315°C | +165°C |
Permissible surface speeds
iglidur X6 is also designed for higher speeds due to its high temperature resistance and good thermal conductivity. At the specified speeds, friction can lead to an increase up to the limit of the permanently permissible temperature. In practice, these limit values cannot always be achieved due to interactions of different influences.
Surface speeds of different iglidur materials
| Maximum surface speed [m/s] | Rotating | Oscillating | linear |
|---|---|---|---|
| Long-term | 1.5 | 1.1 | 5.0 |
| Short-term | 3.5 | 2.5 | 10.0 |
Permissible pv values
Diagram 01: Permissible pv value for iglidur X6 plain bearings with 1mm wall thickness in dry operation against a steel shaft, at +20°C, installed in a steel housing
X = surface speed [m/s]
Y = pressure [MPa]
pv value, max. (dry)
MPa · m/s
1.35
Mechanical specifications
The compressive strength of iglidur X6 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 X6 under radial load. Under the maximum recommended surface pressure of 150MPa, the deformation is less than 2%. Possible plastic deformation depends, among other things, on the duration of the impact.
Friction and wear
Like the wear resistance, the coefficient of friction μ also changes with the load. The coefficient of friction of iglidur X6 decreases with the load and is almost constant from approx. 30MPa. The coefficient of friction also falls significantly with speed (diagrams 04 and 05).
Coefficients of friction against steel (Ra = 1μm, 50HRC):
| iglidur X6 | dry | Greases | Oil | Water |
|---|---|---|---|---|
| Coefficient of friction μ | 0.09-0.25 | 0.09 | 0.04 | 0.04 |
Shaft materials
Friction and wear are also highly dependent on the shaft material. If the shafts are too smooth, the coefficient of friction and the wear of the bearing increase at the same time. The best case for iglidur X6 is a bottom surface with an average surface finish of Ra = 0.4-0.7μm. Diagram 06 shows the results of the tests of various shaft materials with plain bearings made of iglidur X6. The best performance is achieved with the shaft materials free cutting steel and plain steel 1.0037. For higher load cases, we recommend harder steel grades. Unhardened steel shafts can be subject to wear through the bearing at pressures of over 2MPa. According to the wear database, iglidur X6 is more suitable for rotating than pivoting movements (diagram 07). If the shaft material you are planning to use is not listed in these test results, please contact us.
Chemical resistance
iglidur X6 plain bearings are almost universally resistant to chemicals. They are only attacked by concentrated nitric and sulphuric acid. The low moisture absorption also allows them to be used in wet or damp environments. Plain bearings made of iglidur X6 are resistant to common cleaning agents used in the food industry.
All data at room temperature [+20 °C], + resistant 0 conditionally resistant - non-resistant
| Medium | Resistance |
|---|---|
| Alcohols | + |
| Greases, oils without additives | + |
| Hydrocarbons | + |
| Fuels | + |
| Strong alkalines | + |
| Strong acids | + |
| Diluted alkalines | + |
| Diluted acids | + |
Moisture absorption
Installation tolerances
iglidur X6 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 being assembled into a nominal size housing, the inner diameter automatically adjusts to the F10 tolerances. In relation to the installation tolerance, the inner diameter changes with the absorption of humidity.
Important tolerances according to ISO 3547-1 after press-fit:
| Diameter d1 [mm] | Housing H7 [mm] | iglidur X6 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 |
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