|General features||Unit||iglidur® X6||test method|
|Max. humidity absorption at 23°C/50% R. H.||% weight||0,1||DIN 53495|
|Max. water absorption||% weight||0,5|
|Coefficient of surface friction, dynamic, against steel||µ||0,09 - 0,25|
|PV values max. (dry)||MPa x m/s||1,35|
|Bending E-module||MPa||16.000||DIN 53457|
|Tensile strength at +20 °C||MPa||290||DIN 53452|
|Maximum recommended surface pressure (20° C)||MPa||150|
|Shore D hardness||89||DIN 53505|
Physical and thermal properties
|Max. long term application temperature||°C||+250|
|Max. short term application temperature||°C||+315|
|Upper short-term ambient temperature1)||°C||+315|
|Lower application temperature||°C||-100|
|Heat conductivity||W/m x K||0,55||ASTM C 177|
|Coefficient of thermal expansion (at 23° C)||[K-1 x 10-5]||1,1||DIN 53752|
|Specific forward resistance||Ωcm||< 105||DIN IEC 93|
|Surface resistance||Ω||< 103||DIN 53482|
With respect to its general mechanical and thermal properties, iglidur® X6 is directly comparable to our high-temperature classic, iglidur® X, and may even provide advantages, such as its wear behavior.
Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it. With increasing temperatures, the compressive strength of iglidur® X6 plain bearings decreases. Fig. 02 clarifies this connection.
Figure 03 shows the elastic deformation of iglidur® X6 with radial loads. At a surface pressure of 100 MPa, the deformation is less than 2%. A potential plastic deformation depends, among other things, on the length of exposure.
iglidur® X6 is also intended for higher speeds due to its high temperature resistance and good thermal conductivity. At the specified speeds, an increase in temperature up to the long-term permitted value can occur due to friction. In practice these limit values are not always reached due to interactions.
|iglidur® X6||Operating temperature|
|Upper, long-term||+250 °C|
|Upper, short-term||+315 °C|
|Secure axially in addition||+165 °C|
The ambient temperatures influence the properties of bearings to a high degree. In terms of temperature resistance, iglidur® X6 takes a top position among iglidur® materials. In many tests, a six times higher wear resistance than the established "high-temperature specialist" iglidur® X was determined. iglidur® X6 bearings require additional axial securing only above +165°C temperatures.
Just like the wear resistance, the coefficient of friction µ, friction coefficient in short, also alters with the load. The friction coefficient of iglidur® X6 falls with the load and is more or less constant from about 30 MPa. The friction coefficient drops significantly also with the speed (Fig. 04 and 05).
Friction and wear also depend to a high degree on the shaft material. Too smooth shafts increase the friction coefficient and the wear of the bearing at the same time. The best case for iglidur® X6 is a bottom surface with an average roughness of Ra = 0.4-0.7 μm. Fig. 06 shows the results of tests of different shaft materials with plain bearings made of iglidur® X6. The best performance is achieved with the shaft materials machining steel and bright steel 1.0037. For higher load cases we recommend tougher steels. Unhardened steel shafts may be subject to wear through the bearing at pressures of over 2 MPa. According to the wear database, iglidur® X6 is more suitable for rotary than swivel motion (Fig. 07). If the shaft material you are planning to use is not listed in these test results, please contact us.
|Coefficients of friction μ||0,09–0,21||0,09||0,04||0,04|
|Medium||Resistance at 20°C|
|Fats, oils, without additives||+|
|Specific forward resistance||< 105 Ωcm|
|Surface resistance||< 103 Ω|
iglidur® X6 bearings have almost universal chemical resistance. They are affected only by concentrated nitric acid and sulfuric acid. The low humidity absorption allows them to be used in wet or humid environment. The bearings made of iglidur® X6 are resistant to common cleaning agents used in the food industry.
Resistant up to a radiation intensity of 2 x 105 Gy
limited resistance against UV rays
The iglidur® X6 bearings can also be used almost unrestrictedly in vacuum. An outgassing takes place only to a very minor degree.
|Maximum moisture absorption|
|at +23 °C/50 % r.F.||0,1 weight-%|
|Max. water absorption||0,5 weight-%|
The moisture absorption of iglidur® X6 plain bearings amounts to about 0.1% in standard climatic conditions. The saturation limit in water is 0,5 %. These values are so low that a moisture expansion needs to be considered only in extreme cases.
|Up to 3||0 - 0,025||+0,006 +0,046||0 +0,010|
|> 3 to 6||0 - 0,030||+0,010 +0,058||0 +0,012|
|> 6 to 10||0 - 0,036||+0,013 +0,071||0 +0,015|
|> 10 to 18||0 - 0,043||+0,016 +0,086||0 +0,018|
|> 18 to 30||0 - 0,052||+0,020 +0,104||0 +0,021|
|> 30 to 50||0 - 0,062||+0,025 +0,125||0 +0,025|
|> 50 to 80||0 - 0,074||+0,030 +0,150||0 +0,030|
iglidur® X6 bearings are standard bearings for shafts with h-tolerance (recommended minimum h9). The bearings are designed for press-fit in a housing with h7 tolerance. After the installation in a housing with nominal diameter, the inner diameter of the bearing automatically adjusts to the F10 tolerance. Compared to the installation tolerance, the inner diameter varies according to moisture absorption.