iglidur® G - Material data

With increasing temperatures, the compressive strength of iglidur® G bearings decreases. Fig. 02 clarifies this connection. With the long-term permitted application temperature of +130°C, the permitted surface pressure still amounts to 35 MPa. Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it.

 

 

 

 
The Fig. 03 shows the elastic deformation of iglidur® G with radial loads. A plastic deformation can be negligent up to a pressure of about 100 MPa. It is however also dependent on the period of exposure.

iglidur® G has been developed for low to medium surface speeds. The maximum values stated in the Table 02 can be attained only with minor pressure loads. 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.

The ambient temperatures influence the properties of bearings to a high degree. The temperatures prevailing in the bearing system also have an influence on the bearing wear. The wear increases with rising temperatures, and the influence is especially marked from 120°C temperature onwards. An additional securing is recommended at temperatures higher than +80°C.

Just like the wear resistance, the coefficient of friction µ also alters with the load (Fig. 04 and 05).

Friction and wear also depend to a high degree on the reverse partner. Very smooth shafts increase the coefficient of both friction and wear. A smoothed surface with an average surface finish Ra = 0.8 µm is best suited for iglidur® G. Figure 06 displays a summary of the results of tests with different shaft materials, which were conducted with iglidur® G plain bearings. In this connection it is important to note that with increasing loads, the recommended hardness of the shaft increases. The "soft" shafts tend rather to wear themselves and thus increase the wear of the entire system. When the load exceeds 2 MPa, it should be noted that the wear rate (the slope of the curve) tends to decrease with the hardness of the shaft material. Please contact us in case the shaft material scheduled by you is not included here.

Electrical properties

Chemical resistanceiglidur® G bearings have a good resistance against chemicals at room temperature. They are resistant to most lubricants. iglidur® G is not affected by most weak organic and inorganic acids.
 

Radioactive raysiglidur® G bearings are radiation resistant up to a radioactive intensity of 3 • 10² Gy.
 

UV-resistantiglidur® G bearings are permanently resistant against UV rays.
 

VacuumIn vacuum, iglidur® G degases. The application in vacuum is possible only for dry bearings.
 

Electrical propertiesiglidur® G bearings are electrically insulating.

Maximum moisture absorption

The humidity absorption of iglidur® G bearings amounts to about 0,7% in standard climatic conditions. The saturation limit in water is 4 %. This should be considered according to application conditions.

iglidur® G 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. In certain dimensions the tolerance in dependence on the wall thickness deviates from this (See delivery program )