|General features||Unit||iglidur® A290||test method|
|Max. humidity absorption at 23°C/50% R. H.||% weight||1,7||DIN 53495|
|Max. water absorption||% weight||7,3|
|Coefficient of surface friction, dynamic, against steel||µ||0,13 - 0,40|
|PV values max. (dry)||MPa x m/s||0,23|
|Bending E-module||MPa||8.800||DIN 53457|
|Tensile strength at +20 °C||MPa||250||DIN 53452|
|Maximum recommended surface pressure (20° C)||MPa||70|
|Shore D hardness||88||DIN 53505|
Physical and thermal properties
|Max. long term application temperature||°C||+140|
|Max. short term application temperature||°C||+180|
|Lower application temperature||°C||-40|
|Heat conductivity||[W/m x K]||0,24||ASTM C 177|
|coefficient of thermal expansion||[K-1 x 10-5]||7||DIN 53752|
|Specific forward resistance||Ωcm||> 1011||DIN IEC 93|
|Surface resistance||Ω||> 1011||DIN 53482|
iglidur® 290 bearings was developed for use in the food industry. Compared to the bearings made of iglidur® A200, the tribological properties could be significantly improved.
Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it. With increasing temperatures, the compressive strength of iglidur® A290 plain bearings decreases. Fig. 02 clarifies this connection.
Under this load, the deformation is only about 2.5% at room temperature. A plastic deformation can be negligible up to this load. It is however also dependent on the period of exposure. Figure 03 shows the elastic deformation of iglidur® A290 with radial loads.
|iglidur® A290||Operating temperature|
|Lower||- 40 °C|
|Upper, long-term||+ 140 °C|
|Upper, short-term||+ 180 °C|
|Secure axially in addition||+110 °C|
With increasing temperatures, the compressive strength of iglidur® A290 plain bearings decreases. Fig. 02 clarifies this connection. 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 +110°C.
The coefficient of friction alters like the wear resistance with increasing loadand surface speed (Fig. 04 and 05).
|Coefficients of friction µ||0,13 - 0,40||0,09||0,04||0,04|
Figures 06 and 07 show an excerpt of the results of tests with different shaft materials conducted with bearings made of iglidur® A290. Compared to iglidur® A200, the improved tribological properties of iglidur® A290 are also reflected in the coefficients of wear. At low loads, the differences in the wear resistance of the combinations of iglidur® A290 with different shaft materials are very distinct.
|Alcohols||+ to 0|
|Greases, oils without additives||+|
|Diluted acids||0 to -|
|Strong bases||+ to 0|
|Specific forward resistance||> 1011 Ωcm|
|Surface resistance||> 1011 Ω|
iglidur® A290 bearings have a good resistance against chemicals. They are resistant to most lubricants. iglidur® A290 is not affected by most weak organic and inorganic acids.
iglidur® A290 bearings are radiation resistant up to a radioactive intensity of 3 x 10² Gy.
iglidur® A290 bearings are resistant to UV radiation, but the tribological properties deteriorate.
The iglidur® A290 bearings can be used in vacuum only restrictedly due to the high humidity absorption.
iglidur® A290 bearings are electrically insulating.
|Maximum moisture absorption|
|by +23 °C/50 % r. F.||1,7 weight-%|
|Max. water absorption||7,3 weight-%|
The humidity absorption of iglidur® 200 bearings amounts to about 1,7% in standard climatic conditions. The saturation point in water at 7.3% is a disadvantage, which must be accounted for by all means in humid and wet area applications.
|Up to 3||0 - 0,025||+0,020 +0,080||0 +0,010|
|> 3 to 6||0 - 0,030||+0,030 +0,105||0 +0,012|
|> 6 to 10||0 - 0,036||+0,040 +0,130||0 +0,015|
|> 10 to 18||0 - 0,043||+0,050 +0,160||0 +0,018|
|> 18 to 30||0 - 0,052||+0,065 +0,195||0 +0,021|
|> 30 to 50||0 - 0,062||+0,080 +0,240||0 +0,025|
|> 50 to 80||0 - 0,074||+0,100 +0,290||0 +0,030|
iglidur® A290 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 H7, the inner diameter of the bearing automatically adjusts to the D11 tolerance.