iglidur® X6 - Material data

Material table

General specification

Unit

iglidur® X6

Test method

density

g/cm³

1,53

Colour

dark blue

max. Moisture absorption at 23°C/50% room humidity.

% by weight

0,1

DIN 53495

max. total moisture absorption

wt.-%

0,5

Sliding friction coefficient, dynamic, against steel

0,09 - 0,25

pv value, max. (dry)

MPa x m/s

1,35

Mechanical specification

flexural modulus

MPa

16.000

DIN 53457

flexural strength at 20°C

MPa

290

DIN 53452

Compressive strength

MPa

190

maximum recommended surface pressure (20°C)

MPa

150

Shore D hardness

DIN 53505

Physical and thermal specification

Upper long-term application temperature

°C

+250

Upper short-term application temperature

°C

+315

Upper short-term ambient temperature1)

°C

+315

Lower application temperature

°C

-100

thermal conductivity

W/m x K

0,55

ASTM C 177

coefficient of thermal expansion (at 23°C)

[K-1 x 10-5]

1,1

DIN 53752

Electrical specification2)

Volume resistivity

Ωcm

< 105

DIN IEC 93

surface resistance

< 103

DIN 53482

Without additional load; no sliding movement; relaxation not excluded
The good conductivity This plastic can, under certain circumstances, favour the formation of corrosion on the metallic contact body.
Table 01: Material data

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With respect to its general mechanical and thermal specifications, iglidur® X6 is directly comparable to our high-temperature classic, iglidur® X, and may even provide advantages, such as its wear behaviour.

Mechanical specification
The maximum recommended surface pressure represents a mechanical material parameter. It is not possible to draw conclusions about the tribology from this. the compressive strength of iglidur® X6 plain bearings decreases with increasing temperatures. diagram 02 illustrates this relationship.

diagram. 03 shows the elastic deformation of iglidur® X6 under radial load. At a surface pressure of 100 MPa, the deformation is less than 2 %. Possible plastic deformation depends, among other things, on the duration of the impact.

m/s

rotating

oscillating

linear

continuous

1,5

1,1

short-term

3,5

2,5

Table 02: Maximum surface speed

Permissible sliding speeds
iglidur® X6 is also designed for higher speeds due to its high temperature resistance and good thermal conductivity. At the specified speeds, friction can lead to an increase up to the limit of the permanently permissible temperature. In practice, these limit values cannot always be achieved due to the interaction of different influences.

iglidur® X6

Application temperature

below

-100 °C

Upper, long-term

+250 °C

upper, short-term

+315 °C

additional axial protection from

+165 °C

Table 03: Temperature limits for iglidur® X6

Temperatures
The ambient temperature has a strong influence on the specification of plain bearings. In terms of temperature resistance, iglidur® X6 occupies a leading position among the iglidur®materials. In many tests, a wear resistance six times higher than that of the established "high-temperature specialist" iglidur® X was determined. iglidur®® X6 bearings only require an additional locating spigot at temperatures above +165 °C.

Friction and wear
Like the wear resistance, the coefficient of friction μ also changes with the load. The coefficient of friction of iglidur® X6 decreases with the load and is almost constant from approx. 30 MPa. The coefficient of friction also falls significantly with speed (diagrams 04 and 05).

Coefficient of friction

diagram. 06: Wear, rotating application with different shaft materials

Shaft materials
Friction and wear are also highly dependent on the shaft material. If the shafts are too smooth, the coefficient of friction and the wear of the bearing increase at the same time. The best case for iglidur® X6 is a bottom surface with an average surface finish of Ra = 0.4-0.7μm. diagram. 06 shows the results of tests of various shaft materials with plain bearings from iglidur® X6. The best performance is achieved with the shaft materials free-cutting steel and bright steel 1.0037. For higher loads, we recommend harder steel grades. Unhardened steel shafts can be subject to wear through the bearing at pressures of over 2 MPa. According to the wear database, iglidur® X6 is more suitable for rotational than swivelling movements (diagram.07). If the shaft material you are planning to use is not listed in these test results, please contact us.

diagram. 07: Wear with oscillating and rotating

Medium

Resistance at 20 °C

Alcohols

hydrocarbons

Greases, oils, not additivated

fuels

Diluted acids

strong acids

Diluted bases

strong bases

+ resistant 0 conditionally resistant - not resistant
All data at room temperature [+20 °C]
Table 05: chemical resistance of iglidur® X6

Chemical resistance
iglidur® X6 plain bearings are almost universally resistant to chemicals. They are only attacked by concentrated nitric and sulphuric acid. The low moisture absorption also allows them to be used in wet or damp environments. Plain bearings made from iglidur® X6 are resistant to common cleaning agents used in the food industry.

**
Electrical specification
iglidur® X6 plain bearings are electrically conductive**

Volume resistivity

< 105 Ωcm

surface resistance

< 103 Ω

Radioactive rays
Resistant up to a radiation intensity of 2 x 105 Gy

Maximum moisture absorption

at +23 °C/50 % room humidity.

0.1 % by weight

max. total moisture absorption

0.5 % by weight

Table 06: Moisture absorption of iglidur® X6

Moisture absorption
The moisture absorption of iglidur® X6 bearings is about 0.1 % in a normal climate. The saturation limit in water is 0.5 %. These values are so low that consideration of swelling due to moisture absorption is only necessary in extreme cases.

Diameter****d1 [mm]

shaft h9**[mm]**

iglidur® X6****F10 [mm]

housing H7**[mm]**

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 for iglidur® X6 plain bearings according to ISO 3547-1 after press-fitting

Installation tolerances
iglidur® X6 bearings are standard bearings for shafts with tolerance (recommended minimum h9). The bearings are designed to be pressed into an H7-toleranced mounting; after installation in a mounting with nominal dimensions, the inner diameter of the bearing with F10 tolerance adjusts itself. Compared to the installation tolerance, the inner diameter changes depending on the moisture absorption.