|Genera l features||Unit||iglidur® J||test method|
|Max. humidity absorption at 23°C/50% R. H.||% weight||0,3||DIN 53495|
|Max. water absorption||% weight||1,3|
|Coefficient of surface friction, dynamic, against steel||µ||0,06 - 0,18|
|pv values (dry)||MPa x m/s||0,34|
|Bending E-module||MPa||2.400||DIN 53457|
|Tensile strength at +20 °C||MPa||73||DIN 53452|
|Maximum recommended surface pressure (20° C)||MPa||35|
|Shore D-hardness||74||DIN 53505|
Physical and thermal properties
|Max. long term application temperature||°C||+90|
|Max. short term application temperature||°C||+120|
|Minimum application temperature||°C||-50|
|thermal / heat conductivity||[W/m x K]||0,25||ASTM C 177|
|Coefficient of thermal expansion (at 23° C)||[K-1 x 10-5]||10||DIN 53752|
|Specific forward resistance||Ωcm||> 1013||DIN IEC 93|
|surface resistance||Ω||> 1012||DIN 53482|
The iglidur® J bearings are characterized most notably by their extremely low coefficients of friction in dry operation and very low stick-slip effect.
The pressure resistance of iglidur® J plain bearings declines with increasing temperatures. Fig. 02 clarifies this connection. With the long-term permitted application temperature of +90°C, the permitted surface pressure still amounts to 20 MPa. Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it.
The low coefficients of friction and the very low stick-slip tendency of iglidur® J bearings are particularly important at very low speeds. However, iglidur® J can also be used for high speeds of over 1 m/s. In both cases the static friction is very low and stick slip does not occur. The maximum values shown in table 02 can only be achieved at low pressures. At the given speeds, friction can cause a temperature increase to maximum permissible levels. In practice, though, this temperature level is rarely reached due to varying application conditions.
|iglidur® J||Operating temperature|
|Lower||- 50 °C|
|Upper, long-term||+ 90 °C|
|Upper, short-term||+ 120 °C|
|Secure axially in addition||+ 60 °C|
|Coefficients of friction µ||0,06 - 0,18||0,09||0,04||0,04|
Friction and wear also depend to a high degree on the reverse partner. With increasing shaft coarseness the coefficient of friction of the pairing too rises. The best suited is a smoothed surface with an average surface finish of Ra = 0.1 to 0.3 µm. Figures 06 and 07 display a summary of the results of tests with different shaft materials conducted with iglidur® J plain bearings. Compared to the most other iglidur® materials, the wear of iglidur® J plain bearings with low loads is extremely low with all tested shaft materials. The wear resistance of iglidur® J bearings is exceptional even with rising loads in the range of up to 5 MPa. Please contact us in case the shaft material scheduled by you is not included here.
|Greases, oils without additives||+|
|Diluted acids||0 to -|
|Strong bases||+ to 0|
Electrical properties iglidur® J bearings are electrically insulating.
|Specific forward resistance||> 1013 Ωcm|
|Surface resistance||> 1012 Ω|
iglidur® J bearings are resistant to diluted alkalis and very weak acids as well as to fuels and all kinds of lubricants. The low humidity absorption allows them to be used in wet or humid environment. The bearings made of iglidur® J are resistant to common cleaning agents used in the food industry.
Radioactive rays The iglidur® J bearings are radiation resistant up to a radiation intensity of 3 • 102 Gy.
UV-resistantiglidur® J bearings change color under the influence of UV rays. However, the material properties do not change.
VacuumIn vacuum, iglidur® J plain bearings degases. For this reason only dry bearings are suitable for vacuum.
|by +23 °C/50 % r. F.||0,3 weight-%|
|Max. water absorption||1,3 weight-%|
The humidity absorption of iglidur® J bearings amounts to about 0,3% in standard climatic conditions. The saturation limit in water is 1,3 %. These values are so low that a moisture expansion need to be considered only in extreme cases.
|Up to 3||0 - 0,025||+0,014 +0,054||0 +0,010|
|> 3 bis 6||0 - 0,030||+0,020 +0,068||0 +0,012|
|> 6 bis 10||0 - 0,036||+0,025 +0,083||0 +0,015|
|> 10 bis 18||0 - 0,043||+0,032 +0,102||0 +0,018|
|> 18 bis 30||0 - 0,052||+0,040 +0,124||0 +0,021|
|> 30 bis 50||0 - 0,062||+0,050 +0,150||0 +0,025|
|> 50 bis 80||0 - 0,074||+0,060 +0,180||0 +0,030|
|> 80 bis 120||0 - 0,087||+0,072 +0,212||0 +0,035|
|> 120 bis 180||0 - 0,100||+0,085 +0,245||0 +0,040|
iglidur® J 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 )