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	- 🟧 🟧 🟧 ⬜️ ⬜️ +	More information on wear resistance
Wear resistance at +90°C	- 🟧 🟧 🟧 🟧 ⬜️ +
Wear resistance at +150°C	- 🟧 🟧 🟧 🟧 🟧 +
Slide property	- 🟧 🟧 🟧 ⬜️ ⬜️ +	Coefficient of friction, dynamic, against steel: µ 0.09 - 0.25
Wear resistance under water	- 🟧 🟧 🟧 🟧 ⬜️ +
Media resistance	- 🟧 🟧 🟧 🟧 🟧 +	More information on media resistance
Resistant to edge pressures	- 🟧 🟧 🟧 ⬜️ ⬜️ +
Resistant to shock and impact loads	- 🟧 🟧 🟧 ⬜️ ⬜️ +
Dirt resistance	- 🟧 🟧 ⬜️ ⬜️ ⬜️ +

When do I use this material?

If temperatures above +150°C occur
If the wear resistance of iglidur X is not sufficient during pivoting and rotation
If the press-fit is to be improved compared to iglidur X
If the maximum media resistance is required
If freedom from PTFE is required

When do I use a different material?

If you are looking for a cost-effective universal plain bearing -> iglidur G
If you are looking for a plain bearing for underwater use -> iglidur UW500, iglidur H370
If you are looking for a wear-resistant high-temperature plain bearing for linear strokes -> iglidur Z

Download data sheet

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

pv value, max. (dry)

MPa · m/s

1.35

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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.

Further information on shaft materials

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

The moisture absorption of iglidur X6 plain bearings is around 0.1% in a normal climate. The saturation limit in water is 0.5%. These values are so low that consideration of swelling due to moisture absorption is only necessary in extreme cases.

Maximum moisture absorption

at +23°C/50% room humidity.

0.1% weight

Max. total moisture absorption

0.5% weight

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

Thermal conductivity

[W/m · K] 0.55

ASTM C 177

Coefficient of thermal expansion

(at +23°C) [K-1 · 10-5] 1.1

DIN 53752

Resistance to weathering

iglidur X6 plain bearings are permanently resistant to weathering. The material properties deteriorate only slightly. Any discolouration that may occur is only of a superficial nature.