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iglidur® F2 - Material data

Material table

General specification

Unit

iglidur® F2

Test method

density

g/cm³

1,52

Colour

black colour

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

µ

0,16 - 0,22

pv value, max. (dry)

MPa x m/s

0,31

Mechanical specification

flexural modulus

MPa

7.418

DIN 53457

flexural strength at 20°C

MPa

93

DIN 53452

Compressive strength

MPa

61

maximum recommended surface pressure (20°C)

MPa

47

Shore D hardness

72

DIN 53505

Physical and thermal specification

Upper long-term application temperature

°C

+120

Upper short-term application temperature

°C

+165

Lower application temperature

°C

-40

thermal conductivity

[W/m x K]

0,61

ASTM C 177

coefficient of thermal expansion (at 23°C)

[K-1 x 10-5]

5

DIN 53752

Electrical specification

Volume resistivity

Ωcm

< 109

DIN IEC 93

surface resistance

Ω

< 109

DIN 53482

Table 01: Material data

diagram. 01: Permissible pv value for iglidur® F2 plain bearings with 1 mm wall thickness in dry operation against a steel shaft, at +20 °C, installed in a steel housing

X = surface speed [m/s]
Y = load [MPa]

The avoidance of electrostatic charging is an important requirement in many areas of application. At the same time, the other technical application parameters such as wear resistance, media and temperature resistance, usability in humid environments, etc. must not be neglected. iglidur® F2 with its broad property profile represents a new universal bearing for numerous "ESD-compatible" applications.

diagram. 02: maximum recommended surface pressure as a function of temperature (47 MPa at +20 °C)

X = temperature [°C]
Y = load [MPa]

Mechanical specification
The compressive strength of iglidur® F2 plain bearings decreases with increasing temperatures. diagram 02 illustrates this correlation. At the long-term permissible application temperature of +120 °C, the permissible surface pressure is still 20 MPa. The maximum recommended surface pressure represents a mechanical material parameter. Conclusions on the tribology cannot be drawn from this.

Diagram 03 shows the elastic deformation of iglidur® F2 under radial load. Under the maximum recommended surface pressure of 47 MPa, the deformation is less than 2.6 %.Plastic deformation can be ignored up to this compressive load. However, it is also dependent on the duration of the impact.

diagram. 03: Deformation under load and temperatures

X = load [MPa]
Y = deformation [%]

Maximum surface speed

m/s

rotating

oscillating

linear

continuous

0,8

0,7

3

short-term

1,4

1,1

5

Table 02: Maximum surface speed

Permissible sliding speeds
The maximum permissible sliding speeds depend on the operating time and the type of movement. A plain bearing is subjected to the highest loads during long-lasting rotating movements. Here, the maximum speed for iglidur® F2 bearings is 0.8 m/s. The values specified in Table 02 can often not be achieved in practice due to interactions.

iglidur® F2

Application temperature

below

- 40 °C

upper, long-term

+ 120 °C

upper, short-term

+ 165 °C

additional axial protection from

+ 70 °C

Table 03: Temperature limits for iglidur® F2

Temperatures
The ambient temperature has a strong influence on the properties of plain bearings. The compressive strength of iglidur® F2 plain bearings decreases with increasing temperatures. diagram. 02 illustrates this relationship. Additional protection is required at temperatures higher than +70 °C.

Diagram 04: Coefficient of friction as a function of the surface speed, p = 0.75MPa

X = surface speed [m/s]
Y = coefficient of friction μ

friction and wear
coefficient of friction and wear resistance change with the application parameters (diagram. 04 and 05).

Diagram 05: Coefficient of friction as a function of the pressure, v = 0.01m/s

X = load [MPa]
Y = coefficient of friction μ

iglidur® F2

Dry

Grease

oil

water

coefficient of friction µ

0,16 - 0,22

0,1

0,05

0,03

Table 04: coefficient of friction for iglidur® F2 against steel (Ra = 1 μm, 50 HRC)

Wear, rotating application with undercut. Shaft materials

diagram. 06: Wear, rotating application with subdl. shaft materials, p = 1MPa, v = 0.3m/s

X = Shaft material
Y = wear [μm/km]

A = aluminium, hard anodised
B = free cutting steel
C = Cf53
D = Cf53, hard chrome-plated
E = HR carbon steel
F = 304 SS
G = high grade steel

Shaft materials
diagram. 06 shows the results of the tests of various shaft materials with plain bearings made of iglidur® F2. In the lower load range, free-cutting steel and hard-anodised aluminium shafts, but also HR carbon steel and hard-chrome-plated steel shafts prove to be the most favourable mating partners in terms of wear in rotating applications with iglidur® F2 plain bearings. diagram. 07 shows significantly lower wear in rotation compared to swivel movements over the entire load spectrum with otherwise comparable curves.

Shaft materials
Wear for oscillating and rotating

diagram. 07: Wear in oscillating and rotating applications with Cf53 as a function of the load

X = load [MPa]
Y = wear [μm/km]

A = rotating | B = oscillating

Medium

Resistance

Alcohols

hydrocarbons

-

Greases, oils, not additivated

fuels

Diluted acids

0

strong acids

-

diluted bases

-

strong bases

-

+ resistant 0 conditionally resistant - not resistant
All data at room temperature [+20 °C]
Table 05: chemical resistance of iglidur® F2

Chemical resistance
iglidur® F2 plain bearings have good resistance to chemicals. They are resistant to most lubricants. iglidur® F2 is not attacked by most weak organic and organic acids.

**
Electrical specification

Volume resistivity

< 109 Ωcm

surface resistance

< 109 Ω

Radioactive radiation
Bearings made of iglidur® F2 are resistant to radiation up to a radiation intensity of 3 - 10² Gy.

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 of iglidur® F2

Moisture absorption
The moisture absorption of iglidur® F2 bearings is about 0.2 % in a normal climate. The saturation limit in water is 0.4 % and thus very low. This must be taken into account under appropriate operating conditions.

Influence of moisture absorption

diagram. 9: Influence of moisture absorption

X = Moisture absorption [Gew.-%]
Y = Reduction inside ø [%]

Diameter****d1 [mm]

shaft h9**[mm]**

iglidur® F2****D11 [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® F2 plain bearings according to ISO 3547-1 after press-fitting

Installation tolerances
iglidur® F2 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 is automatically adjusted with E10 tolerance in standard cases. For certain dimensions, the tolerance deviates depending on the wall thickness (see product range).

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