iglidur® G1 - Material data

Technical data

General specification

Unit

iglidur® G1

Test method

density

g/cm³

1,58

Colour

grey

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

% by weight

0,2

DIN 53495

max. total moisture absorption

wt.-%

1,7

coefficient of friction, dynamic, against steel

0,10 - 0,29

pv value, max. (dry)

MPa - m/s

0,60

Mechanical specification

flexural modulus

MPa

11.486

DIN 53457

flexural strength at +20°C

MPa

178

Compressive strength

MPa

115

max. recommended surface pressure (+20°C)

MPa

Shore D hardness

DIN 53505

Physical and thermal specification

Upper application temperature long-term

°C

+180

Upper application temperature short-term

°C

+220

Lower application temperature

°C

-40

thermal conductivity

[W/m · K]

0,25

ASTM C 177

coefficient of thermal expansion (at +23°C)

[K-1 · 10-5]

3,7

DIN 53752

Electrical specification

Volume resistivity

Ωcm

> 109

DIN IEC 93

surface resistance

> 109

DIN 53482

Table 01: Material properties

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Diagram 01: Permitted pv values for iglidur® G1

The requirement profile is demanding: comprehensive further development of the successful all-round classic iglidur® G. This has been achieved above all in terms of moisture absorption, thermal specification and consistently improved wear resistance. Only in terms of impact, shock and edge loads was it not quite possible to match the robustness of iglidur® G.

Mechanical specification
The compressive strength of iglidur® G1 plain bearings decreases with increasing temperatures. diagram. 02 illustrates this relationship. At the long-term permissible application temperature of +180 °C, the permissible surface pressure is approximately 40 MPa. The maximum recommended surface pressure represents a mechanical material parameter. Conclusions about the tribology cannot be drawn from this.

Diagram 03 shows the elastic deformation of iglidur® G1 at radial loads. The plastic deformation is minimal up to a pressure of approximately 100MPa. However, it is also dependent on the service time.

Maximum surface speed

m/s

rotating

oscillating

linear

long-term

1,3

1,0

5,0

short-term

2,5

1,8

6,0

Table 02: Maximum surface speed

Permissible sliding speeds
iglidur® G1 was developed for low to medium sliding speeds. The maximum values specified in Table 03 can only be achieved with 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 due to the interaction of various influences.

iglidur® G1

Application temperature

below

-40°C

upper, long-term

+180°C

upper, short-term

+220°C

additional axial protection from

+120°C

Table 03: Temperature limits

Temperature
The ambient temperature strongly influences the specification of plain bearings. 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 +120 °C. Above 120 °C, additional securing of the bearing in the mount is also required.

Friction and wear
The coefficient of friction μ of a plain bearing is influenced by surface speed and load, among other factors (diagram. 04 and 05).

iglidur® G1

dry

Grease

oil

water

coefficient of friction µ

0,13 - 0,32

0,09

0,04

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

Shaft materials
Friction and wear are also highly dependent on the mating partner. 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® G1. diagram. 06 shows an extension of the results of tests with different shaft materials that were carried out with plain bearings made from iglidur® G1. It can be seen that iglidur® G1 achieves good to very good wear results with all shaft materials. The stainless steel types are the most likely to fall slightly behind. diagram. 07 compares the rotating and swivelling wear. As with many iglidur® materials, the wear rate is better when swivelling.

Shaft materials

Chemicals

Resistance

Alcohols

+ to 0

hydrocarbons

Greases, oils, not additivated

fuels

Diluted acids

0 to -

strong acids

Dilute bases

strong bases

+ resistant 0 conditionally resistant - not resistant

All data at room temperature [+20 °C]
Table 04: chemical resistance

Moisture absorption
The moisture absorption of iglidur® G1 bearings is about 0.2% by weight in a normal climate. The saturation limit in water is 1.7% by weight. This must be taken into account under appropriate operating conditions.

Ø d1**[mm]**

housing H7**[mm]**

plain bearing F10**[mm]**

shaft h9**[mm]**

to 3

+0,000 +0,010

+0,006 +0,046

-0,025 +0,000

> 3 to 6

+0,000 +0,012

+0,010 +0,058

-0,030 +0,000

> 6 to 10

+0,000 +0,015

+0,013 +0,071

-0,036 +0,000

> 10 to 18

+0,000 +0,018

+0,016 +0,086

-0,043 +0,000

> 18 to 30

+0,000 +0,021

+0,020 +0,104

-0,052 +0,000

> 30 to 50

+0,000 +0,025

+0,025 +0,125

-0,062 +0,000

> 50 to 80

+0,000 +0,030

+0,030 +0,150

-0,074 +0,000

> 80 to 120

+0,000 +0,035

+0,036 +0,176

-0,087 +0,000

> 120 to 180

+0,000 +0,040

+0,043 +0,203

+0,000 +0,100

Table 05: Important tolerances according to ISO 3547-1 after press-fitting

Installation tolerances
iglidur® G1 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 F10 tolerance adjusts itself automatically. For certain dimensions, the tolerance deviates from this depending on the wall thickness (see product range).