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iglidur® F2 - material data

Material table

General features Unit iglidur® F2 test method
Density g/cm³ 1,52
Colour black
Max. humidity absorption at 23°C/50% R. H. % weight 0,2 DIN 53495
Max. water absorption % weight 0,4
Coefficient of surface friction, dynamic, against steel µ 0,16 - 0,22
PV values max. (dry) MPa x m/s 0,31

Mechanical properties
Bending E-module MPa 7.418 DIN 53457
Tensile strength at +20 °C MPa 93 DIN 53452
compressive strength MPa 61
Maximum recommended surface pressure (20° C) MPa 47
Shore D hardness 72 DIN 53505

Physical and thermal properties
Max. long term application temperature °C +120
Max. short term application temperature °C +165
Lower application temperature °C -40
Heat conductivity [W/m x K] 0,61 ASTM C 177
Coefficient of thermal expansion (at 23° C) [K-1 x 10-5] 5 DIN 53752

Electrical properties
Specific forward resistance Ωcm < 109 DIN IEC 93
Surface resistance Ω < 109 DIN 53482
'Table 01: Material Data



 

Figure 01: Permitted pv-values for iglidur® F2 bearings with 1 mm wall thickness in dry operation against a steel shaft, at +20°C, installed in a steel housing.
 
X = Surface speed [m/s]
Y = Load [MPa]


 
The prevention of electrostatic charge is an important requirement in many application areas At the same time, the other technical application parameters, such as wear resistance, media, and temperature resistance, use in wet environments, etc. must not fall by the wayside With its broadproperty profile, iglidur® F2 represents a new universal bearing for a wide range of EMC compatible applications.


Figure 02: Maximum recommended surface pressure dependent on the temperature (47 MPa to +20 °C)
 
X = Temperature [°C]
Y = Load [MPa]
Figure 03: Deformation under load and temperatures
 
X = Load [MPa]
Y = Deformatio [%]

Mechanical properties

The pressure resistance of iglidur® F2 plain bearings declines with increasing temperatures. Fig. 02 clarifies this connection. With the long-term permitted application temperature of +120°C, the permitted surface pressure still amounts to 20 MPa. Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it.
 
Fig. 03 shows the elastic deformation of iglidur® F2 during radial loading. Under the maximum recommended surface pressure of 47 MPa, the deformation amounts to less than 2,6%. A plastic deformation can be negligible up to this pressure load. It is however also dependent on the period of exposure.


Maximum surface speed

m/s Rotary oscillating Linear
Constant 0,8 0,7 3
Short-term 1,4 1,1 5
Table 02: Maximum surface speeds

Permitted surface speeds

The maximum permitted surface speeds are based on the operation period and the type of motion. A bearing is the most stressed in long-term rotating motions. Here the maximum speed for the iglidur® F2 bearing is 0.8 m/s. The maximum values specified in Table 02 are not often attained in practice due to interactions.


iglidur® F2 Application temperature
Lower - 40 °C
Upper, long-term + 120 °C
Upper, short-term + 165 °C
Secure axially in addition + 70 °C
Table 03: Temperature limits for iglidur® F2

Temperatures

The ambient temperatures strongly influence the properties of bearings. The pressure resistance of iglidur® F2 bearings declines with increasing temperatures. Fig. 02 highlights this correlation. Additional safety is required at temperatures over +70°C.


Figure 04: Coefficients of friction dependent on the surface speed, p = 0,75 MPa
 
X = Sliding speed [m/s]
Y = Coefficient of friction μ
Figure 05: Coefficients of friction dependent on the load, v = 0.01 m/s
 
X = Load [MPa]
Y = Coefficient of friction μ

Friction and wear

Coefficient of friction and wear resistance alter with the application parameters(Fig. 04 and 05).

iglidur® F2 Dry Grease Oil Water
Coefficients of friction µ 0,16 - 0,22 0,1 0,05 0,03

Table 04: Coefficients of friction for iglidur® F2 against steel (Ra = 1 µm, 50 HRC)


Wear, rotating application with various shaft materials Fig. 06: Wear, rotating application with various shaft materials p = 1 MPa, v = 0,3 m/s
 
X = shaft materials
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

Fig. 06 shows the results of tests of various shaft materials with bearings made of iglidur® F2. In the lower load range, machining steel and hard-anodised aluminium shafts, as well as St37 and hard-chrome-plated steel shafts prove to be the best counter partners in rotating applications with iglidur® F2 bearings from a wear perspective. Fig. 07 shows a far lower level of wear with rotational movements than pivoting movements across the complete load spectrum, with an otherwise comparable graph line shape.

Wear in oscillating and rotating Fig. 07: Wear with oscillating and rotating applications with Cf53 as a function of the load
 
X = Load [MPa]
Y = Wear [μm/km]
 
A = Rotating | B = Oscillating

Medium Resistance
Alcohols +
Hydrocarbons -
Greases, oils without additives +
Fuels +
Diluted acids 0
Strong acids -
Diluted bases -
Strong bases -
+ resistant      0 limited resistance      - not resistant
All specifications at room temperature[+20 °C]
Table 05: Chemical resistance of the iglidur® bearings F2


Electrical properties

Specific forward resistance < 109 Ωcm
Surface resistance < 109 Ω

Chemical resistance

iglidur® F2 bearings have a good resistance against chemicals. They are resistant to most lubricants. iglidur® F2 is not affected by most weak organic and inorganic acids.

Radioactive rays

iglidur® F2 bearings are radiation resistant up to a radioactive intensity of 3 · 10² Gy.
 

UV-resistant

iglidur ® F2 plain bearings provide comparatively good UV resistance.
 

Vacuum

In application in vacuum, the potentially existent moisture content is degassed. For this reason only the dry iglidur® F2 bearings are suitable for vacuum.
 

Electrical properties

iglidur® F2 bearings are electrically conductive.


Maximum moisture absorption
by +23 °C/50 % r. F. 0,2 weight-%
Max. water absorption 0,4 weight-%
Table 06: Moisture absorption of iglidur® F2

Effect of moisture absorption on plain bearings Diagram 9: Effect of moisture absorption
 
X = Moisture absorption [weight %]
Y = Reduction of inside diameter [%]

Moisture absorption

The humidity absorption of iglidur® F2 bearings amounts to about 0.2 % in standard climatic conditions. The saturation limit in water is very low at 0.4%. This must be taken into account according to application conditions.


Diameter
d1 [mm]
Shaft
h9 [mm]
iglidur® F2
D11 [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® F2 bearings according to ISO 3547-1 after the press-in.

Installation tolerances

iglidur® F2- 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 )