|General features||Unit||iglidur® A180||test method|
|Max. humidity absorption at 23°C/50% R. H.||% weight||0,2||DIN 53495|
|Max. water absorption||% weight||1,3|
|Coefficient of surface friction, dynamic, against steel||µ||0,05 - 0,23|
|PV values max. (dry)||MPa x m/s||0,31|
|Bending E-module||MPa||2.300||DIN 53457|
|Tensile strength at +20 °C||MPa||88||DIN 53452|
|Maximum recommended surface pressure (20° C)||MPa||28|
|Shore D hardness||76||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||> 1012||DIN IEC 93|
|Surface resistance||Ω||> 1011||DIN 53482|
Bearings made of iglidur® A180 are suitable for application in direct contact with foodstuffs. Hence they are the ideal solution for bearing positions on machines for the food and packaging industries, the medical equipment manufacturing, for small equipment for households, etc. The iglidur® A180 distinguishes itself also in wet cleaning or where process-dependent contact with wet media is the business of the day by its extremely low humidity absorption
Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it. With increasing temperatures, the compressive strength of iglidur® A180 bearings decreases. Fig. 02 clarifies this connection.
Figure 03 shows the elastic deformation of iglidur® A180 with radial loads. Under the maximum recommended surface pressure of 20 MPa, the deformation amounts to less than 2.5%. A plastic deformation is negligible up to this radial load. It is however also dependent on the period of exposure.
iglidur® A180 is developed for low surface speeds. Maximum speeds up to 0.8 m/s (rotating) and 3.5 m/s (linear) respectively are permitted for continuous application in dry operation. The values specified in Table 02 state the limits to which the long-term permitted temperature rises due to friction heat. In practice these limit values are not always reached due to interactions.
|iglidur® A180||Operating temperature|
|Lower||- 50 °C|
|Upper, long-term||+ 90 °C|
|Upper, short-term||+ 110 °C|
|Secure axially in addition||+ 60 °C|
The upper short-term application temperature is +110℃. With increasing temperatures, the compressive strength of iglidur® A180 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 +60°C.
Coefficient of friction and wear resistance alter with the application parameters. With increasing load, the coefficient of friction however sinks markedly (Fig. 04 and 05).
|Coefficients of friction µ||0,05 - 0,23||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® A180. The combination "iglidur® A180/hard anodized aluminum" clearly stands out. It attains good to excellent wear rates also with other shafts. With Cf53 shafts, the higher wear in swivelling applications is exemplary compared to rotating applications (Fig. 07).
|Greases, oils without additives||+|
|Diluted acids||0 to -|
|Strong bases||+ to 0|
|Specific forward resistance||> 1012 Ωcm|
|Surface resistance||> 1011 Ω|
iglidur® A180 bearings can be used under various environmental conditions and in contact with numerous chemicals. Table 05 gives an overview of the chemical resistance of iglidur® A180 bearings at room temperature.
iglidur® A180 bearings are radiation resistant up to a radioactive intensity of 3 x 10² Gy. Higher radiations affect the material and can lead to the loss of important mechanical properties.
iglidur® A180 bearings are resistant to UV radiation, but the tribological properties deteriorate with continuous exposure.
In application in vacuum, the potentially existent moisture content is degassed. For this reason only dry bearings are suitable for vacuum.
|Maximum moisture absorption|
|by +23 °C/50 % r. F.||0,2 weight-%||Max. water absorption||1,3 weight-%|
The iglidur® A180 bearings absorb up to 0.2% water through atmospheric humidity (+23°C, 50% relative atmospheric humidity), when saturated with water they absorb 1.3%.
|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|
iglidur® A180 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.