iglidur® GV0 - Material data

Material table

General specification

Unit

iglidur® GV0

Test method

density

g/cm³

1,53

Colour

black colour

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

% by weight

0,7

DIN 53495

max. total moisture absorption

wt.-%

4,0

Sliding friction coefficient, dynamic, against steel

0,07-0,20

pv value, max. (dry)

MPa x m/s

0,5

Mechanical specification

flexural modulus

MPa

7.900

DIN 53457

flexural strength at 20°C

MPa

140

DIN 53452

Compressive strength

MPa

100

maximum recommended surface pressure (20°C)

MPa

Shore D hardness

DIN 53505

Physical and thermal specification

Upper long-term application temperature

°C

+130

Upper short-term application temperature

°C

+210

Lower application temperature

°C

-40

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

< 1011

DIN 53482

Table 01: Material data

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iglidur® GV0 is the first iglidur® material with V0 rating according to UL94 for universal use in the normal temperature range. all other iglidur® materials with V0 rating belong to the high temperature segment. The general mechanical and thermal specifications are largely comparable with the all-rounder iglidur® G.

Mechanical specification
The compressive strength of iglidur® G V0 plain bearings decreases with increasing temperatures. diagram 02 illustrates this relationship. At the long-term permissible application temperature of +130 °C, the permissible surface pressure is still around 35 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® G V0 under radial load. Plastic deformation can be neglected up to a pressure of approx. 100 MPa, but is also dependent on the duration of the load.

m/s

rotating

oscillating

linear

continuous

0,7

short-term

1,4

Table 02: Maximum surface speed

Permissible sliding speeds
iglidur® G V0 was developed for low to medium sliding speeds. the maximum values specified in Table 02 can only be achieved at low pressure loads. In practice, these limit values cannot always be achieved due to interactions between different influences.

iglidur® G V0

Application temperature

below

- 40 °C

upper, long-term

+ 130 °C

upper, short-term

+ 210 °C

additional axial protection from

+ 80 °C

Table 03: Temperature limits

Temperatures
The ambient temperature has a strong influence on the specification of plain bearings.The maximum permissible short-term temperature is +210 °C and therefore permits the use of iglidur® G V0 plain bearings in applications in which the bearing is subjected to a paint drying process, for example, without further load.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 upwards. Additional protection is required at temperatures higher than +100 °C.

coefficient of friction plain bearing GV0

Friction and wear
Like the wear resistance, the coefficient of friction μ also changes with the load.Interestingly, the coefficient of friction decreases significantly with increasing load, while an increasing sliding speed causes a slight increase in the coefficient of friction.This correlation explains the excellent suitability of iglidur® G V0 plain bearings for high loads and low speeds (diagrams 04 and 05).

coefficient of friction as a function of load GV0

iglidur® G V0

dry

Grease

oil

water

coefficient of friction µ

0,15 - 0,23

0,09

0,04

Table 04: coefficient of friction for iglidur® G V0 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. iglidur® G V0 is best suited for a ground surface with an average surface finish Ra between 0.6 and 0.8 μm. diagram. 06 shows an extension of the results of tests with different shaft materials that were carried out with iglidur® G V0 bearings. In this context, it is important to note that the recommended hardness of the shaft increases with increasing loads. If the load exceeds 2 MPa, it should be borne in mind that the wear rate (the curve gradient) tends to decrease with the hardness of the shaft material.The comparison of rotating and swivelling movements shows that iglidur® G is particularly advantageous in swivelling movements (diagram 07). If the shaft material you have in mind is not included in the test results presented here, please contact us.

Shaft materials

Medium

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 05: chemical resistance

Chemical resistance
iglidur® G V0 bearings have good resistance to chemicals at room temperature. They are resistant to most lubricants. iglidur® G V0 is not attacked by most weak organic and inorganic acids.

**
Electrical specification

Volume resistivity

< 1012 Ωcm

surface resistance

< 1011 Ω

Radioactive radiation
Bearings made of iglidur® G V0 are resistant to radiation up to a radiation intensity of 3 - 10² Gy.

Maximum moisture absorption

at +23 °C/50 % room humidity.

0.7 % by weight

max. total moisture absorption

4.0 % by weight

Table 06: Moisture absorption

Moisture absorption
The moisture absorption of iglidur® G V0 bearings is about 0.7 % in a normal climate. The saturation limit in water is 4 %. This must be taken into account for the corresponding application conditions.

Diameter****d1 [mm]

shaft h9**[mm]**

iglidur® G V0****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® G V0 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 is automatically adjusted.