iglidur® J2 - Material data

Maximum surface speed

m/s

rotating

oscillating

linear

continuous

0,8

0,7

3

short-term

1,9

1,1

5

Table 02: Maximum surface speed

Permissible sliding velocities
iglidur® J2 is mainly suitable for low sliding speeds in dry operation, whereby the limit values specified in Table 02 can only be reached at very 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® J2

Application temperature

lower

- 50 °C

upper, long-term

+ 90 °C

upper, short-term

+ 110 °C

additional axial protection from

+ 60 °C

Table 03: Temperature limits for iglidur® J2

Temperatures
The temperatures prevailing in the bearing system also have an influence on bearing wear. Wear increases with rising temperatures, and the effect is particularly noticeable from a temperature of +90 °C. An additional fuse is required at temperatures above +60 °C.

iglidur® J2

dry

Grease

oil

water

coefficient of friction µ

0,11 - 0,27

0,08

0,07

0,04

Table 04: Coefficient of friction for iglidur® J2 against steel (Ra = 1 μm, 50 HRC)

friction and wear
The coefficient of friction and wear resistance depend on the application parameters (diagrams 04 and 05).

Medium

Resistance

Alcohols

hydrocarbons

Greases, oils, not additivated

fuels

Diluted acids

0 to -

strong acids

-

Dilute bases

strong bases

+ to 0

+ resistant 0 conditionally resistant - not resistant

All data at room temperature [+20 °C]
Table 05: chemical resistance of iglidur® J2

Further specification
chemical resistance
iglidur® J2 plain bearings are resistant to diluted alkalis and very weak acids as well as fuels and all types of lubricants. The low moisture absorption also permits use in wet or damp environments. Plain bearings made of iglidur® J2 are resistant to numerous cleaning agents commonly used in the food industry.

Radioactive radiationSliding bearingsmade of iglidur® J2 are resistant to radiation up to a radiation intensity of 3 - 102 Gy.

UV resistanceiglidur® J2 plain bearings discolour under the influence of UV rays. However, the hardness, compressive strength and wear resistance of the material do not deteriorate.

VacuumWhenused in a vacuum, any existing moisture content will outgas. Therefore, only dry bearing ausiglidur® J2 are suitable for vacuum.

Electrical specificationiglidur® J2 plain bearings are electrically insulating.

Volume resistivity

> 1013 Ωcm

surface resistance

> 1012 Ω

Maximum moisture absorption

at +23 °C/50 % room humidity.

0.2 % by weight

max. total moisture absorption

1.3 % by weight

Table 06: Moisture absorption of iglidur® J2

Moisture absorption
The moisture absorption of iglidur® J2 bearings is about 0.2 % in a normal climate. The saturation limit in water is 1.3 %. 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® J2****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 for iglidur® J2 plain bearings according to ISO 3547-1 after press-fitting

Installation tolerances
iglidur® J2 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 E10 tolerance adjusts itself. Compared to the installation tolerance, the inner diameter changes depending on the moisture absorption.