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iglidur® A181 - material data
The most important specifications at a glance
Due to their technical specifications and their conformity with the relevant regulations, iglidur A181 plain bearings are predestined for applications in food technology. Compared to iglidur A180 with regard to the mechanical properties, temperature and media resistance, iglidur A181 is more suitable with respect to the wear resistance in most cases.
| Descriptive technical specifications | ||
|---|---|---|
| Wear resistance at +23°C | - 🟧 🟧 🟧 🟧 ⬜️ + | |
| Wear resistance at +90°C | - 🟧 🟧 ⬜️ ⬜️ ⬜️ + | |
| Wear resistance at +150°C | - 🟧 ⬜️ ⬜️ ⬜️ ⬜️ + | |
| Slide property | - 🟧 🟧 🟧 ⬜️ ⬜️ + | Coefficient of friction, dynamic, against steel: µ 0.10 - 0.21 |
| Wear resistance under water | - 🟧 🟧 🟧 ⬜️ ⬜️ + | |
| Media resistance | - 🟧 🟧 🟧 🟧 ⬜️ + | |
| Resistant to edge pressures | - 🟧 🟧 🟧 🟧 🟧 + | |
| Resistant to shock and impact loads | - 🟧 🟧 🟧 🟧 🟧 + | |
| Dirt resistance | - 🟧 🟧 🟧 🟧 ⬜️ + |
Temperatures
The upper long-term application temperature of +90°C allows for a wide range of applications in the food sector. The compressive strength decreases with increasing temperatures. When considering temperatures, the additional frictional heat in the bearing system must be taken into account. At temperatures over +60°C, additional securing is recommended.
Further information on temperatures
| min. application temperature | Upper application temperature, long-term | Upper application temperature, short-term | In addition secure axially from |
|---|---|---|---|
| -50°C | +90°C | +110°C | +60°C |
Permissible surface speeds
iglidur A181 was developed for low surface speeds. Maximum speeds of up to 0.8m/s (rotating) and 3.5m/s (linear), respectively, are permissible during continuous dry operation. The values in the table indicate the limits at which an increase up to the continuous permissible temperature occurs as a result of friction. In practice, these limits cannot always be reached due to reciprocal effects.
Surface speeds of various iglidur materials
| Maximum surface speeds [m/s] | Rotating | Oscillating | linear |
|---|---|---|---|
| Long-term | 0.8 | 0.6 | 3.5 |
| Short-term | 1.2 | 1.0 | 5.0 |
Permissible pv values
Diagram 01: Permissible pv values for iglidur A181 plain bearings with a wall thickness of 1mm in dry operation against a steel shaft at +20°C, mounted in a steel housing
X = Surface speed [m/s]
Y = Load [MPa]
Mechanical properties
With increasing temperatures, the compressive strength of iglidur A181 plain bearings decreases. Diagram 02 shows this inverse relationship. The maximum recommended surface pressure is a mechanical material parameter. No conclusions regarding the tribological properties can be drawn from this. Diagram 03 shows the elastic deformation of iglidur A181 under radial loads.
Friction and wear
The coefficient of friction and the wear resistance vary with the application parameters (diagrams 04 and 05). For iglidur A181 plain bearings, the alteration of the coefficient of friction µ has little effect on the surface speed and shaft surface finish.
Coefficient of friction against steel (Ra = 1µm, 50HRC):
| iglidur A181 | dry | Greases | Oil | Water |
|---|---|---|---|---|
| Coefficient of friction μ | 0.10 - 0.21 | 0.08 | 0.03 | 0.04 |
Shaft materials
Diagram 06 shows the results of testing different shaft materials with plain bearings made from iglidur A181. Particular attention is paid in the food industry to the corrosion-resistant shaft types. Diagram 06 shows that very low wear rates can be achieved in combination with these shafts. As with many iglidur materials, the wear rate increases with otherwise identical parameters in rotation (diagram 07).
Chemical resistance
iglidur A181 plain bearings can be used in a wide range of environmental conditions and in contact with numerous chemicals. The table provides an overview of the chemical resistance of iglidur A181 plain bearings at room temperature.
All data at room temperature [+20 °C], + resistant 0 conditionally resistant - non-resistant
| Medium | Resistance |
|---|---|
| Alcohols | + |
| Greases, oils without additives | + |
| Hydrocarbons | + |
| Fuels | + |
| Strong alkalines | + up to 0 |
| Strong acids | - |
| Diluted alkalines | + |
| Diluted acids | 0 to - |
Moisture absorption
Installation tolerances
iglidur A181 plain bearings are standard bearings for shafts with h-tolerance (recommended minimum h9). The bearings are designed for press-fit into a housing machined to a H7 tolerance. After being assembled into a nominal size housing, the inner diameter of the bearing automatically adjusts to the E10 tolerances.
Important tolerances according to ISO 3547-1 after press-fit:
| Diameter d1 [mm] | Housing H7 [mm] | iglidur A181 plain bearing E10 [mm] | Shaft h9 [mm] |
|---|---|---|---|
| up to 3 | +0.000 +0.010 | +0.014 +0.054 | -0.025 +0.000 |
| > 3 up to 6 | +0.000 +0.012 | +0.020 +0.068 | -0.030 +0.000 |
| > 6 up to 10 | +0.000 +0.015 | +0.025 +0.083 | -0.036 +0.000 |
| > 10 up to 18 | +0.000 +0.018 | +0.032 +0.102 | -0.043 +0.000 |
| > 18 up to 30 | +0.000 +0.021 | +0.040 +0.124 | -0.052 +0.000 |
| > 30 up to 50 | +0.000 +0.025 | +0.050 +0.150 | -0.062 +0.000 |
| >50 to 80 | +0.000 +0.030 | +0.060 +0.180 | -0.074 +0.000 |
| >80 to 120 | +0.000 +0.035 | +0.072 +0.212 | -0.087 +0.000 |
| > 120 up to 180 | +0.000 +0.040 | +0.085 +0.245 | -0.100 +0.000 |
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