iglidur® R - Material data

Figure 02: Maximum recommended surface pressure dependent on the temperature (23 MPa to +20 °C)

X = Temperature [°C]
Y = Load [MPa]

Figure 03: Deformation under load and temperatures

X = Load [MPa]
Y = Deformation [m/s]

Mechanical properties

Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it. With increasing temperatures, the compressive strength of iglidur® R plain bearings decreases. Fig. 02 clarifies this connection.

Figure 03 shows the elastic deformation of iglidur® R with radial loads. Under the maximum permitted load of 23 MPa, the deformation amounts to 4%. A plastic deformation can be negligible up to this value. It is however also dependent on the period of exposure.

Maximum surface speed

m/s	Rotating	Oscillating	Linear
Constant	0,8	0,6	3,5
Short-term	1,2	1	5

Permitted surface speeds

iglidur® R bearings are suitable for high surface speeds. Speeds of up to 10 m/s are permitted in linear motions! Here too the specified maximum values can be achieved only with minimum pressure loads. The specified values show the speed at which due to friction an increase in temperature up to the long-term permitted value can occur.

iglidur® R	Operating temperature
Lower	- 50 °C
Upper, long-term	+ 90 °C
Upper, short-term	+ 110 °C
Secure axially in addition	+ 50 °C

Table 03: Temperature limits for iglidur® R

Temperatures

With increasing temperatures, the compressive strength of iglidur® R plain 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 +50°C.

Figure 2.4: Coefficients of friction dependent on the surface speed, p = 0.75 MPa

Friction and wear

The coefficient of friction declines like the wear resistance with increasing load. iglidur® R is suitable for applications in which high pv values are induced mainly through the high surface speed and not as much through the surface pressure. Less distinct is the dependency of the coefficient of friction of the iglidur® R bearings on the shaft surface.
 

Coefficients of friction for iglidur® R against steel
(Ra = 1 µm, 50 HRC)

iglidur® R	Dry	Fat	Oil	Water
Coefficients of friction µ	0,09 - 0,25	0,09	0,04	0,04

Fig. 06: Wear, rotating application with different shaft materials, load p = 1 MPa, v = 0.3 m/s
 
X = Shaft material
Y = Wear [μm/km]
 
A = Aluminum, hard-anodized
B = machining steel
C = Cf53
D = Cf53, hard chrome-plated
E = St37
F = V2A
G = X90

Shaft materials

Figures 06 and 07 display a summary of the results of tests with different shaft materials conducted with bearings made of iglidur® R. At 0.3m/s and 1 MPa, the X90 and Cf53 shafts are the best gliding partners. With increasing loads the iglidur® R bearings feature the best wear behavior with CF53 and V2A shafts. In pivoting application, the hard-chromed shaft proves to be the ideal partner.
Please contact us in case the shaft material scheduled by you is not included here.

Medium	Resistance
Alcohol	+ to 0
Hydrocarbons	+
Fats, oils, without additives	+
Fuels	+
Diluted acids	0 to -
Strong acids	-
Diluted bases	+
Strong bases	+ to 0

+ resistant      0 conditionally resistant      - non-resistant

Electrical properties

Specific forward resistance	> 1012 Ωcm
Surface resistance	> 1012 Ω

Chemical resistance

iglidur® R bearings can be used under various environmental conditions and in contact with numerous chemicals. Table 18.6 gives an overview of the chemical resistance of iglidur® R bearings at room temperature.

The iglidur® R bearings are not chemically altered by humidity absorption. However alteration of the features can occur according to water content. The iglidur® R bearings absorb up to 0.2% water through atmospheric humidity (23° C, 50% relative atmospheric humidity), and up to 1.1% in saturation in water.

Radioactive rays

iglidur® R bearings are radiation resistant up to a radioactive intensity of 3 x 10² Gy.

UV-resistant

iglidur® R bearings are resistant to UV radiation, but the tribological properties deteriorate with continuous exposure.

Vacuum

In vacuum, iglidur® R degases. The use in vacuum is possible only limitedly.

Electrical properties

iglidur® R bearings are electrically insulating.

Important tolerances for iglidur® R bearings according to ISO 3547-1 after the press-fit.

Diameter d1 [mm]	Shaft h9 [mm]	iglidur® R E10 [mm]	Housing H7 [mm]
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
> 50 to 80	0 - 0,074	+0,060 +0,180	0 +0,030
> 80 to 120	0 - 0,087	+0,072 +0,212	0 +0,035
> 120 to 180	0 - 0,100	+0,085 +0,245	0 +0,040

Table 07: Important tolerances for iglidur® R bearings according to ISO 3547-1 after the press-fit.

Installation tolerances

iglidur® R 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 )