iglidur® J260 - Material data

Material table

General specification

Unit

iglidur® J260

Test method

density

g/cm³

1,35

Colour

yellow

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

% by weight

0,2

DIN 53495

max. total moisture absorption

wt.-%

0,4

Sliding friction coefficient, dynamic, against steel

0,06 - 0,20

pv value, max. (dry)

MPa x m/s

0,35

Mechanical specification

flexural modulus

MPa

2.200

DIN 53457

flexural strength at 20°C

MPa

DIN 53452

Compressive strength

MPa

maximum recommended surface pressure (20°C)

MPa

Shore D hardness

DIN 53505

Physical and thermal specification

Upper long-term application temperature

°C

+120

Upper short-term application temperature

°C

+140

Lower application temperature

°C

-100

thermal conductivity

[W/m x K]

0,24

ASTM C 177

coefficient of thermal expansion (at 23°C)

[K-1 x 10-5]

DIN 53752

Electrical specification

Volume resistivity

Ωcm

> 1012

DIN IEC 93

surface resistance

> 1010

DIN 53482

Table 01: Material data

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diagram. 01: Permissible pv value for iglidur® J260 plain bearings

Similar to the classic, iglidur® J, iglidur® J260 is an endurance runner with outstanding wear behaviour, but provides increased reserves at its long-term application temperature of +120°C.

maximum recommended surface pressure as a function of temperature

Mechanical specification
The maximum recommended surface pressure represents a mechanical material parameter. The compressive strength of iglidur® J260 plain bearings decreases with increasing temperatures. diagram 02 illustrates this relationship.

diagram. 03 shows the elastic deformation of iglidur® J260 under radial load. Under the maximum recommended surface pressure of 40 MPa, the deformation is less than 2.5 %. Possible plastic deformation depends, among other things, on the duration of the impact.

m/s

rotating

oscillating

linear

continuous

0,7

short-term

1,4

Table 02: Maximum surface speed

Permissible sliding speeds
iglidur® J260 has been developed for low to medium sliding speeds. The maximum values specified in Table 02 can only be achieved at low pressure loads. 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.

iglidur® J260

Application temperature

lower

- 100 °C

Upper, long-term

+ 120 °C

upper, short-term

+ 140 °C

additional axial protection from

+ 80 °C

Table 03: Temperature limits for iglidur® J260

Temperatures
The temperatures prevailing in the bearing system also have an influence on bearing wear. Wear increases with rising temperatures, and the influence is particularly noticeable from a temperature of +80 °C. An additional fuse is required at temperatures higher than +80 °C.

Friction and wear
Like the wear resistance, the coefficient of friction μ also changes with the load. Interestingly, the coefficient of friction decreases with increasing load, while an increasing sliding speed causes a slight increase in the coefficient of friction (diagrams 04 and 05).

Coefficient of friction

Shaft materials
Friction and wear are also highly dependent on the shaft material. Shafts that are too smooth increase both the coefficient of friction and the wear of the bearing. A ground surface with an average surface finish Ra = 0.8 μm is best suited for iglidur® J260. diagram. 06 shows the results of the tests of various shaft materials with bearings made of iglidur® J260. In this context, it is important to note that the recommended hardness of the shaft increases with increasing loads. The "soft" shafts tend to wear themselves and thus increase the wear of the overall system if the loads exceed 2 MPa. The comparison of rotation and swivelling in diagram. 07 makes it very clear that iglidur® J260 bearings play out their strengths above all in rotational operation.

Shaft materials

Medium

Resistance at 20°C

Alcohols

+ to 0

Hydrocarbons

Greases, oils, not additivated

0 to -

Fuels

Diluted acids

strong acids

dilute bases

+ to 0

strong bases

+ to 0

All data at room temperature [+20 °C]Table 05: chemical resistance of iglidur® J260

Chemical resistance
iglidur® J260 plain bearings are resistant to diluted alkalis, hydrocarbons and alcohols, and their very low moisture absorption also allows them to be used in wet or damp environments.

Volume resistivity

> 1012 Ωcm

surface resistance

> 1010 Ω

Radioactive rays
Resistant up to a radiation intensity of 3x 102 Gy

Moisture absorption
The moisture absorption of iglidur® J260 bearings is about 0.2 % in a normal climate. The saturation limit in water is 0.4 %. These values are so low that a consideration of the swelling due to moisture absorption can be neglected.

Maximum moisture absorption

at +23 °C/50 % room humidity.

0.2 % by weight

max. total moisture absorption

0.4 % by weight

Table 06: Moisture absorption

Diameter****d1 [mm]

shaft h9**[mm]**

iglidur® J260****E10 [mm]

housing H7**[mm]**

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 according to ISO 3547-1 after press-fitting

Installation tolerances
iglidur® J260 plain bearings are standard bearings for shafts with h-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 E10 tolerance adjusts itself automatically. For certain dimensions, the tolerance deviates from this depending on the wall thickness (see product range).