|General features||Unit||iglidur® X||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 - 0,27|
|PV values max. (dry)||MPa x m/s||1,32|
|Bending E-module||MPa||8.100||DIN 53457|
|Tensile strength at +20 °C||MPa||170||DIN 53452|
|Maximum recommended surface pressure (20° C)||MPa||150|
|Shore D hardness||85||DIN 53505|
Physical and thermal properties
|Max. long term application temperature||°C||+250|
|Max. short term application temperature||°C||+315|
|Lower application temperature||°C||-100|
|Heat conductivity||[W/m x K]||0,6||ASTM C 177|
|Coefficient of thermal expansion (at 23° C)||[K-1 x 10-5]||5||DIN 53752|
|Specific forward resistance||Ωcm||< 105||DIN IEC 93|
|Surface resistance||Ω||< 103||DIN 53482|
iglidur® X is primarily characterized by the combination of high temperature resistance with compressive strength and high chemical resistance. The aspects of heat resistance and compressive strength are also reflected in the PV diagram.
Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it. With increasing temperatures, the compressive strength of iglidur® X bearings decreases. Fig. 02 clarifies this connection.
Fig. 03 also shows how the iglidur® X bearings elastically deform under static loads.
iglidur® X is designed for higher speeds than other iglidur® bearings. This is made possible by a high temperature resistance and very high thermal conductivity. This is already clear from the pv values of maximum 1.32 MPa · m/s. At the same time, only minimal radial forces act on the bearings in this case. At the specified speeds, an increase in temperature up to the long-term permitted value can occur due to friction.
|iglidur® X||Operating temperature|
|Lower||- 100 °C|
|Upper, long-term||+ 250 °C|
|Upper, short-term||+ 315 °C|
|Secure axially in addition||+ 135 °C|
With a permitted long-term application temperature of 250°C, the iglidur® X tolerates even 315°C on a short term. Like in all thermoplastics, the compressive strength of iglidur® X decreases with rising temperature. An additional securing is recommended at temperatures higher than +135°C. The firm seating of the bearing in the housing should be checked in tests at temperatures above 170°C. Please contact us if there is any query about the application of the bearing.
Friction and wear also depend to a high degree on the reverse partner. Extremely smooth shafts enhance the coefficient of friction of the bearing. Ideal are smoothed surfaces with an average surface finish of Ra of 0.6 to 0.8 μm.
Figures 06 and 07 display a summary of the results of tests with different shaft materials conducted with iglidur® X plain bearings. Please contact us in case the shaft material scheduled by you is not included here.
|Fats, oils, without additives||+|
|Specific forward resistance||< 105 Ωcm|
|Surface resistance||< 103 Ω|
iglidur® X bearings have almost universal chemical resistance. They are usually affected only by concentrated acids.
The iglidur® X bearings are radiation resistant up to a radiation intensity of 1 • 105 Gy.
The excellent material features of the iglidur® X do not alter under UV radiation and other climatic influences.
The iglidur® X bearings can also be used almost unrestrictedly in vacuum. An evaporation takes place only to a minor degree.
Bearings made of iglidur® X are electrically conductive.
The humidity absorption of iglidur® X bearings is extremely low. In standard climatic conditions, it lies below 0.1 Wt-%. The maximum water absorption is 0.5 Wt-%.
|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® X bearings are standard bearings for shafts with h-tolerance (recommended minimum s 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. In certain dimensions the tolerance in dependence on the wall thickness deviates from this (See delivery program )