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iglidur® X - Material data

Materials table

General features Unit iglidur® X test method
Density g/cm³ 1,44
Colour black
Max. humidity absorption at 23°C/50% R. H. % weight 0,1 DIN 53495
Max. water absorption % weight 0,5
Coefficient of surface friction, dynamic, against steel µ 0,09 - 0,27
PV values max. (dry) MPa x m/s 1,32

Mechanical properties
Bending E-module MPa 8.100 DIN 53457
Tensile strength at +20 °C MPa 170 DIN 53452
compressive strength MPa 100
Maximum recommended surface pressure (20° C) MPa 150
Shore D hardness 85 DIN 53505

Physical and thermal properties
Max. long term application temperature °C +250
Max. short term application temperature °C +315
Lower application temperature °C -100
Heat conductivity [W/m x K] 0,6 ASTM C 177
Coefficient of thermal expansion (at 23° C) [K-1 x 10-5] 5 DIN 53752

Electrical properties
Specific forward resistance Ωcm < 105 DIN IEC 93
Surface resistance Ω < 103 DIN 53482
'Table 01: Material Data





Figure 01: Permitted PV values for iglidur® X 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]


 
iglidur® X is primarily characterized by the combination of high temperature resistance with compressive strength and high chemical resistance. The aspects of heat resistance and compressive strength are also reflected in the PV diagram.


Figure 02: Maximum recommended surface pressure dependent on the temperature (150 MPa to +20 °C)

X = Temperature [°C]
Y = Load [MPa]
Figure 03: Deformation under load and temperatures

X = Load [MPa]
Y = Deformation [%]

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® X bearings decreases. Fig. 02 clarifies this connection.


 

 

 

 
Fig. 03 also shows how the iglidur® X bearings elastically deform under static loads.


Maximum surface speed

m/s Rotating oscillating Linear
Constant 1,5 1,1 5
Short-term 3,5 2,5 10

Table 02: Maximum surface speeds

Permitted surface speeds

iglidur® X is designed for higher speeds than other iglidur® bearings. This is made possible by a high temperature resistance and very high thermal conductivity. This is already clear from the pv values of maximum 1.32 MPa · m/s. At the same time, only minimal radial forces act on the bearings in this case. At the specified speeds, an increase in temperature up to the long-term permitted value can occur due to friction.


Temperature limits

iglidur® X Operating temperature
Lower - 100 °C
Upper, long-term + 250 °C
Upper, short-term + 315 °C
Secure axially in addition + 135 °C
Table 03: Temperature limits for iglidur® G

Temperatures

With a permitted long-term application temperature of 250°C, the iglidur® X tolerates even 315°C on a short term. Like in all thermoplastics, the compressive strength of iglidur® X decreases with rising temperature. An additional securing is recommended at temperatures higher than +135°C. The firm seating of the bearing in the housing should be checked in tests at temperatures above 170°C. Please contact us if there is any query about the application of the bearing.


Coefficients of friction Figure 04: Coefficients of friction dependent on the surface speed, p = 0.75 MPa
 
X = Sliding speed [m/s]
Y = Coefficient of friction μ
Coefficients of friction 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

Just like the wear resistance, the coefficient of friction µ also alters with the load (Fig. 04 and 05).

iglidur® X Dry Grease Oil Water
Coefficients of friction µ 0,09 - 0,27 0,09 0,04 0,04

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



Wear Figure 06: Wear, rotating application with different shaft materials, p = 1 MPa, v = 0,3 m/s
 
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

Friction and wear also depend to a high degree on the reverse partner. Extremely smooth shafts enhance the coefficient of friction of the bearing. Ideal are smoothed surfaces with an average surface finish of Ra of 0.6 to 0.8 μm.
 
Figures 06 and 07 display a summary of the results of tests with different shaft materials conducted with iglidur® X plain bearings. Please contact us in case the shaft material scheduled by you is not included here.

Wear Fig. 07: Wear in pivoting and oscillating applications with various shaft materials, p = 2 MPa
 
Y = wear [μm/km]
 
A = Cf53
B = hard chrome-plated
C = V2A
 
blue= rotary
pink= oscillating

Medium Resistance
Alcohols +
Hydrocarbons +
Fats, oils, without additives +
Fuels +
Diluted acids +
Strong acids -
Diluted bases +
Strong bases +
+ resistant      0 partially resistant      - non-resistant
All specifications at room temperature [+20°C] Table 05: Chemical resistance of iglidur®


Electrical properties

Specific forward resistance < 105 Ωcm
Surface resistance < 103 Ω

Chemical resistance

iglidur® X bearings have almost universal chemical resistance. They are usually affected only by concentrated acids.

Radioactive rays

The iglidur® X bearings are radiation resistant up to a radiation intensity of 1 • 105 Gy.

UV-resistant

The excellent material features of the iglidur® X do not alter under UV radiation and other climatic influences.

Vacuum

The iglidur® X bearings can also be used almost unrestrictedly in vacuum. An evaporation takes place only to a minor degree.

Electrical properties

Bearings made of iglidur® X are electrically conductive.


Effect of moisture absorption on plain bearings Diagram 10: Effect of moisture absorption
 
X = Moisture absorption [weight %]
Y = Reduction of inside diameter [%]

humidity absorption / moisture absorption

The humidity absorption of iglidur® X bearings is extremely low. In standard climatic conditions, it lies below 0.1 Wt-%. The maximum water absorption is 0.5 Wt-%.


Diameter
d1 [mm]
Shaft
h9 [mm]
iglidur® X
F10 [mm]
Housing H7
[mm]
Up to 3 0 - 0,025 +0,006 +0,046 0 +0,010
> 3 to 6 0 - 0,030 +0,010 +0,058 0 +0,012
> 6 to 10 0 - 0,036 +0,013 +0,071 0 +0,015
> 10 to 18 0 - 0,043 +0,016 +0,086 0 +0,018
> 18 to 30 0 - 0,052 +0,020 +0,104 0 +0,021
> 30 to 50 0 - 0,062 +0,025 +0,125 0 +0,025
> 50 to 80 0 - 0,074 +0,030 +0,150 0 +0,030

Table 07: Important tolerances iaw. ISO 3547-1 after press-fitting.

Installation tolerances

iglidur® X bearings are standard bearings for shafts with h-tolerance (recommended minimum s 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 F10 tolerance. In certain dimensions the tolerance in dependence on the wall thickness deviates from this (See delivery program )