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iglidur® Q2 - material data
The most important specifications at a glance
iglidur Q2 plain bearings represent high load capacities and good abrasion resistance at high loads. The price-performance ratio is outstanding. Solid lubricants reduce the coefficient of friction and improve resistance to wear, which is much better than other iglidur plain bearings, especially for heavily loaded pivoting applications.
| Descriptive technical specifications | ||
|---|---|---|
| Wear resistance at +23°C | - 🟧 🟧 🟧 ⬜️ ⬜️ + | More information on wear resistance |
| Wear resistance at +90°C | - 🟧 🟧 ⬜️ ⬜️ ⬜️ + | |
| Wear resistance at +150°C | - 🟧 🟧 ⬜️ ⬜️ ⬜️ + | |
| Slide property | - 🟧 🟧 🟧 ⬜️ ⬜️ + | Coefficient of friction, dynamic, against steel: µ 0.22 – 0.42 |
| Wear resistance under water | - 🟧 ⬜️ ⬜️ ⬜️ ⬜️ + | |
| Media resistance | - 🟧 🟧 🟧 ⬜️ ⬜️ + | More information on media resistance |
| Resistant to edge pressures | - 🟧 🟧 🟧 🟧 🟧 + | |
| Resistant to shock and impact loads | - 🟧 🟧 🟧 🟧 🟧 + | |
| Dirt resistance | - 🟧 🟧 🟧 🟧 🟧 + |
Temperatures
iglidur Q2 is an extremely temperature-resistant material. The long-term upper application temperature of +130°C permits broad use, e.g. in typical applications in the agricultural, commercial vehicle or construction vehicle sectors. However, the compressive strength of iglidur Q2 plain bearings decreases with increasing temperatures. Additional protection is required at temperatures higher than +70°C. When considering temperatures, the additional frictional heat in the bearing system must be taken into account.
Temperatures, coefficient of thermal expansion
| min. application temperature | Upper application temperature, long-term | Upper application temperature, short-term | In addition secure axially from |
|---|---|---|---|
| -40°C | +130°C | +200°C | +70°C |
Permissible surface speeds
Typical applications for iglidur Q2 plain bearings are pivoting movements under high loads at relatively low speeds. Irrespective of this, high maximum speeds can certainly be achieved. The speeds stated in the table are limit values for the lowest bearing loads. With higher loads, the permitted speed decreases with the extent of the load due to the limitations of the pv value.
Surface speeds of various iglidur materials
| Maximum surface speed [m/s] | Rotating | Oscillating | linear |
|---|---|---|---|
| Long-term | 1.0 | 0.7 | 4.0 |
| Short-term | 2.0 | 1.4 | 5.0 |
Permissible pv values
Diagram 01: Permitted pv values for iglidur Q2 plain bearings with 1mm wall thickness in dry operation against a steel shaft, at +20°C, installed in a steel housing
X = surface speed [m/s]
Y = pressure [MPa]
Mechanical properties
With increasing temperatures, the compressive strength of iglidur Q2 plain bearings decreases. Diagram 02 shows this inverse relationship. At the long-term permissible application temperature of +130°C, the permitted surface pressure is still 20MPa. iglidur Q2 plain bearings stand for high load capacity and good abrasion resistance at high loads. Diagram 03 shows the elastic deformation of iglidur Q2 under radial loads.
Friction and wear
The coefficient of friction of iglidur Q2 is low. It must be noted that a mating surface that is too rough will increase the friction. The highest coefficients of friction are reached at Ra = 1μm. We recommend shaft roughnesses (Ra) of 0.1 to a maximum of 0.4μm. The coefficient of friction of the iglidur Q2 plain bearings also depends to a large extent on the speed and the load. As the surface speed increases, the coefficient of friction also rises rapidly. With the load, on the other hand, the coefficient of friction initially decreases significantly, then gradually.
Coefficients of friction against steel (Ra = 1μm, 50HRC):
| iglidur Q2 | dry | Greases | Oil | Water |
|---|---|---|---|---|
| Coefficient of friction μ | 0.22 - 0.42 | 0.09 | 0.04 | 0.04 |
Shaft materials
In high load applications, we generally recommend the use of hardened shafts. Furthermore, even at low to medium loads, iglidur Q2 will attain increased service life with "hard" shafts as compared to "soft" shafts. But for low load applications, the results are outstanding with free cutting steel as well. For high loads, the wear in pivoting applications is much lower than in rotating applications. If the shaft material you plan on using is not shown in these test results, please contact us.
Chemical resistance
iglidur Q2 plain bearings have good resistance to chemicals. They are resistant to most lubricants. Their resistance is only limited with acids.
All data at room temperature [+20 °C], + resistant 0 conditionally resistant - non-resistant
| Medium | Resistance |
|---|---|
| Alcohols | + |
| Greases. Oils without additives | + |
| Hydrocarbons | + |
| Fuels | + |
| Strong alkalines | 0 |
| Strong acids | - |
| Diluted alkalines | + |
| Diluted acids | 0 to - |
Moisture absorption
Installation tolerances
iglidur Q2 plain bearings are standard bearings for shafts with h-tolerance (recommended minimum h9). The bearings are designed for press-fitting into a housing machined to a H7 tolerance. After installation in a housing with nominal dimensions, the inner diameter of the bearings with E10 tolerance adjusts automatically. For certain dimensions, the tolerance deviates from this depending on the wall thickness (see product range).
Important tolerances according to ISO 3547-1 after press-fit:
| Diameter d1 [mm] | Housing H7 [mm] | iglidur Q2 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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Typical application areas
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