|General features||Unit||iglidur® D||test method|
|Max. humidity absorption at 23°C/50% R. H.||% weight||0,3||DIN 53495|
|Max. water absorption||% weight||1,1|
|Coefficient of surface friction, dynamic, against steel||µ||0,08 - 0,26|
|PV values max. (dry)||MPa x m/s||0,27|
|Bending E-module||MPa||2.000||DIN 53457|
|Tensile strength at +20 °C||MPa||72||DIN 53452|
|Maximum recommended surface pressure (20° C)||MPa||23|
|Shore D hardness||78||DIN 53505|
Physical and thermal properties
|Max. long term application temperature||°C||+90|
|Max. short term application temperature||°C||+110|
|Lower application temperature||°C||-50|
|Heat conductivity||W/m x K||0,25||ASTM C 177|
|Coefficient of thermal expansion (at 23° C)||K-1 x 10-5||11||DIN 53752|
|Specific forward resistance||Ωcm||> 1014||DIN IEC 93|
|Surface resistance||Ω||> 1014||DIN 53482|
The development of the iglidur® D as a plain bearing material placed high performances and very low cost high up on the application profile. In addition it should achieve low coefficients of friction in the dry operation especially at high speeds. The material containing silicon moreover achieves extremely low coefficients of friction in dry operation and runs largely free of stick-slip effects.
Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it. With increasing temperatures, the compressive strength of iglidur® D plain bearings decreases. Fig. 02 clarifies this connection.
iglidur® D bearings were developed mainly for low to medium radial loads. Figure 03 shows the elastic deformation of iglidur® D with radial loads. The deformation amounts to about 3% at the maximum recommended surface pressure of 23 MPa. A plastic deformation can be negligible up to this value. It is however also dependent on the period of exposure.
iglidur® D bearings are suitable for high surface speeds. Speeds of up to 10 m/s are permitted in linear motions! Here too the specified maximum values can be achieved only with minimum pressure loads. The specified values show the speed at which an increase in temperature up to the long-term permitted value can occur due to friction.
|iglidur® D||Application temperature|
|Lower||- 50 °C|
|Upper, long-term||+ 90 °C|
|Upper, short-term||+ 110 °C|
|Secure axially in addition||+ 50 °C|
With increasing temperatures, the compressive strength of iglidur® D plain bearings decreases. Fig. 02 clarifies this connection. The temperatures prevailing in the bearing system also have an influence on the bearing wear. An additional securing is recommended at temperatures higher than +50°C.
The coefficient of friction declines like the wear resistance with increasing load. In the Ra range between 0.4 and 0.6 µm, the coefficient of friction attains its optimum value.
|Coefficients of friction µ||0,08 - 0,26||0,09||0,04||0,04|
Figures 06 and 07 display a summary of the results of tests with different shaft materials conducted with bearings made of iglidur® D.
Please contact us in case the shaft material scheduled by you is not included in this list.
|Greases, oils without additives||+|
|Diluted acids||0 to -|
|Strong bases||+ to 0|
|Specific forward resistance||> 1014 Ωcm|
|Surface resistance||> 1014 Ω|
iglidur® D bearings are resistant to very weak acids, diluted alkalis as well as to fuels and all kinds of lubricants.
iglidur® D bearings are radiation resistant up to a radioactive intensity of 3 x 10² Gy.
iglidur® D bearings are resistant to UV radiation, but the tribological properties deteriorate with continuous exposure.
In vacuum, iglidur® D degases. The use in vacuum is possible only limitedly.
iglidur® D bearings are electrically insulating.
The iglidur® D bearings are manufactured according to order specifications. Please contact us for applications with large numbers of bearings made of iglidur® D as alternative to iglidur® J.
|Maximum moisture absorption|
|by +23 °C/50 % r. F.||0,3 weight-%|
|Max. water absorption||1,1 weight-%|
The humidity absorption of iglidur® J bearings amounts to about 0.3 Wt.-% in standard climatic conditions. The saturation limit in water is 1,1 %. This low humidity absorption also allows the use in wet environment.
|Up to 3||0 - 0,025||+0,014 +0,054||0 +0,010|
|> 3 to 6||0 - 0,030||+0,020 +0,068||0 +0,012|
|> 6 to 10||0 - 0,036||+0,025 +0,083||0 +0,015|
|> 10 to 18||0 - 0,043||+0,032 +0,102||0 +0,018|
|> 18 to 30||0 - 0,052||+0,040 +0,124||0 +0,021|
|> 30 to 50||0 - 0,062||+0,050 +0,150||0 +0,025|
|> 50 to 80||0 - 0,074||+0,060 +0,180||0 +0,030|
|> 80 to 120||0 - 0,087||+0,072 +0,212||0 +0,035|
|> 120 to 180||0 - 0,100||+0,085 +0,245||0 +0,040|
iglidur® D- 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 E10 tolerance.