|Genera l features||Unit||iglidur® C500||test method|
|Max. humidity absorption at 23°C/50% R. H.||% weight||0,3||DIN 53495|
|Max. water absorption||% weight||0,5|
|Coefficient of surface friction, dynamic, against steel||µ||0,07 - 0,19|
|pv values (dry)||MPa x m/s||0,7|
|Bending E-module||MPa||3000||DIN 53457|
|Tensile strength at +20 °C||MPa||100||DIN 53452|
|Maximum recommended surface pressure (20° C)||MPa||110|
|Shore D-hardness||81||DIN 53505|
Physical and thermal properties
|Max. long term application temperature||°C||+250|
|Max. short term application temperature||°C||+300|
|Minimum application temperature||°C||-100|
|thermal / heat conductivity||[W/m x K]||0,24||ASTM C 177|
|Coefficient of thermal expansion (at 23° C)||[K-1 x 10-5]||9||DIN 53752|
|Specific forward resistance||Ωcm||>1014||DIN IEC 93|
|surface resistance||Ω||>1013||DIN 53482|
iglidur® C500 is a member of the family of extremely media and temperature-resistant iglidur® materials X, X6 and A500. This material is characterised by improved wear resistance and increased design flexibility - for instance as a piston ring.
Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it. With increasing temperatures, the compressive strength of iglidur® C500 plain bearings decreases. Fig. 02 clarifies this connection.
Figure 03 shows how iglidur® C500 elastically deforms under radial load. Under the maximum recommended surface pressure of 110 MPa, the deformation at room temperature is below 4,5%.
The maximum permissible surface speed is determined by the resulting frictional heat at the bearing point. The temperature should rise only up to a value that still ensures a reasonable bearing insert with regard to wear and dimensional accuracy.
The maximum values stated in Table 02 are valid only with minimum pressure loads and are often not attained in practice.
|iglidur® C500||Application temperature|
|Lower||- 100 °C|
|Upper, long-term||+ 250 °C|
|Upper, short-term||+ 300 °C|
|Secure axially in addition||+ 130 °C|
The iglidur® C500 is one of the most temperature-resistant iglidur® materials. Like in all thermoplastics, the compressive strength of iglidur® C500 decreases with rising temperature. The temperatures prevailing in the bearing system also have an influence on the bearing wear. The wear rises with increasing temperatures. An additional securing is recommended at temperatures higher than +130°C.
The friction and wear values for iglidur® C500
are even more favourable than on the other high-temperature materials, iglidur® X and A500. The friction value increases moderately as the gliding speed increases. The friction value initially drops rapidly to less than 0.1 under loads of up to approx. 20 MPa, and then only marginally increases as loads continue to increase. Friction and wear also depend to a high degree on the reverse partner. Very smooth shafts increase the coefficient of both friction and wear. Ideally suited is a smoothed surface with an average surface finish of Ra = 0.6 to 0.8 µm.
|Coefficients of friction µ||0,07 - 0,19||0,09||0,04||0,04|
The Fig. 06 displays the results of tests with different shaft materials conducted with plain bearings made of iglidur® C500.
In the example of a rotational motion with radial loads of 1 MPa and a speed of 0.3 m/s, it becomes clear that iglidur® C500 is very constant in wear for a wide variety of shaft types. In this case, only the pairing with machining steel stand out upwards, and remarkably the pairing with aluminium HC downwards. The wear in rotation is higher than in swivelling movements (Figure 07) particularly with increasing radial loads.
|Greases, oils without additives||+|
|Specific forward resistance||> 1014 Ωcm|
|surface resistance||> 1013 Ω|
iglidur® C500 plain bearings have good resistance
to chemicals. br>
Most organic and inorganic acids, as well as alkalis or lubricants do not attack iglidur® C500.
iglidur® C500 withstands both the neutron and gamma particle radiations without noticeable loss to its excellent mechanical properties. iglidur® C500 bearings are radiation resistant up to a radioactive intensity of 3 x 10² Gy.
iglidur® C500 bearings are permanently resistant against UV rays.
Water elements are degassed in the vacuum. Due to the low water absorption, an application in the vacuum is however possible.
|Maximum moisture absorption|
|by +23 °C/50 % r. F.||0,3 weight-%|
|Max. water absorption||0,5 weight-%|
The humidity absorption of iglidur® C500 bearings amounts to about 0.3 Wt.-% in standard climatic conditions. The saturation limit in water is likewise below 0.5%.
|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® C500- 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.