iglidur® J3 - material data

Material table

General specification

Unit

iglidur® J3

Test method

density

g/cm³

1,42

Colour

yellow

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

% by weight

0,3

DIN 53495

max. total moisture absorption

wt.-%

1,3

Sliding friction coefficient, dynamic, against steel

0,06 - 0,20

pv value, max. (dry)

MPa x m/s

0,5

Mechanical specification

flexural modulus

MPa

2.700

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

+90

upper short-term application temperature

°C

+120

Lower application temperature

°C

-50

thermal conductivity

W/m x K

0,25

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

> 1012

DIN 53482

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With respect to its general mechanical and thermal specifications, iglidur® J3 is directly comparable to our classic, iglidur® J.

Mechanical specification
The maximum recommended surface pressure is a mechanical material parameter. Conclusions about the tribology cannot be drawn from this. The compressive strength of iglidur® J3 plain bearings decreases with increasing temperatures. diagram. 02 illustrates this relationship.

diagram. 03 shows the elastic deformation of iglidur® J3 under radial load. Under the maximum recommended surface pressure of 45 MPa, the deformation is less than 6 %. Possible plastic deformation depends, among other things, on the duration of the impact.

Maximum surface speed

m/s

rotating

oscillating

linear

continuous

1,5

1,1

short-term

2,1

Table 02: Maximum sliding speeds

Permissible sliding speeds
iglidur® J3 is also suitable for medium to high speeds, whereby the limit values specified in Table 02 can only be achieved 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® J3

Application temperature

below

-50°C

upper, long-term

+90 °C

upper, short-term

+120 °C

additional axial protection from

+60 °C

Table 03: Temperature limits

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.

Friction and wear
Like the wear resistance, the coefficient of friction μ also changes with the load (diagram. 04 and 05).

iglidur® J3

dry

Grease

oil

water

coefficient of friction μ

0,08-0,15

0,09

0,04

Table 04: coefficient of friction against steel (Ra= 1 μ, 50 HRC)

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. iglidur® J3 is best suited to a ground surface with an average surface finish Ra = 0.1-0.3 μm. Fig. 06 shows that iglidur® J3 can be combined with many different shaft materials. Diagram 07 compares rotation and swivelling operation. It can be seen that with increasing load, the wear increases more with rotation than with swivelling movements.

Shaft materials

diagram. 07: Wear in swivelling and rotating applications

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 resistantTable 05: chemical resistance of iglidur® J3

Chemical resistance
iglidur® J3 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 allows them to be used in wet or damp environments. Plain bearings made from iglidur® J3 are resistant to numerous cleaning agents used in the food industry.

**
Electrical specification

Volume resistivity

> 1012 Ωcm

surface resistance

> 1012 Ω

Radioactive rays
Resistant up to a radiation intensity of 1 x 104 Gy

Maximum moisture absorption

at +23 °C/50 % room humidity.

0.3 % by weight

max. total moisture absorption

1.3 % by weight

Table 06: Moisture absorption

Moisture absorption
The moisture absorption of iglidur® J3 bearings is about 0.3 % 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® J3****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® J3 plain bearings are standard bearings for shafts with h-tolerance (at least h9 recommended). 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.