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iglidur® F - Material data

Material table

General specifications

Unit

iglidur® F

Test method

Density

g/cm³

1.25

Colour

black

Max. total moisture absorption at 23°C/50% room humidity

% weight

1.8

DIN 53495

Max. total moisture absorption

% weight

8.4

Sliding friction coefficient, dynamic, against steel

µ

0.1 - 0.39

pv value, max. (dry)

MPa x m/s

0.34

Mechanical specifications

Elastic modulus

MPa

11.600

DIN 53457

Flexural strength at 20°C

MPa

260

DIN 53452

Compressive strength

MPa

98

Maximum recommended surface pressure (20°C)

MPa

105

Shore D hardness

84

DIN 53505

Physical and thermal specifications

Upper long-term application temperature

°C

+140

Upper short-term application temperature

°C

+180

Lower application temperature

°C

-40

Thermal conductivity

[W/m x K]

0.65

ASTM C 177

Coefficient of thermal expansion (at 23°C)

[K-1 x 10-5]

12

DIN 53752

Electrical specifications

Specific transitional resistance

Ωcm

< 103

DIN IEC 93

Surface resistance

Ω

< 102

DIN 53482

Table 01: Material data

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

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

When plain bearings need to be electrically conductive, especially in applications that should keep out static, iglidur® F is the right choice. Moreover, the iglidur® F plain bearings are extremely pressure-resistant. At room temperature, they could be statically loaded up to 100MPa.

Diagram 02: Maximum recommended surface pressure as a function of temperature (105MPa at +20°C)

X = temperature [°C]
Y = pressure [MPa]

Mechanical specifications
The maximum recommended surface pressure represents a mechanical material parameter. Conclusions on the tribology cannot be drawn from this. The compressive strength of iglidur® F plain bearings decreases with increasing temperatures. Diagram 02 illustrates this correlation. At the long-term permissible application temperature of +140°C, the permissible surface pressure is still 50MPa.

Diagram 03 shows the elastic deformation of iglidur® F under radial loads. Under the maximum recommended surface pressure of 105MPa, the deformation is less than 3.0%. Plastic deformation can be negligible up to this compressive load. However, it also depends on the duration of exposure.

Diagram 03: Deformation under load and temperatures

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

Maximum surface speed

m/s

Rotating

Oscillating

Linear

Continuous

0.8

0.6

3

short-term

1.5

1.1

6

Table 02: Maximum surface speed

Permissible surface speeds
The maximum permissible surface speeds depend on the duration of operation 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® F plain bearings is 0.8m/s. Otherwise, the maximum values specified in Table 02 can only be achieved with the lowest pressure loads. These limit values can often not be achieved in practice due to interactions.

iglidur® F

Application temperature

lower

- 40°C

upper, long-term

+ 140°C

upper, short-term

+ 180°C

Additional axial protection from

+ 105°C

Table 03: Temperature limits for iglidur® F

Temperatures
The ambient temperatures strongly influence the specifications of plain bearings. With increasing temperatures, the compressive strength of iglidur® F plain bearings decreases and wear also increases. Additional protection is required at temperatures higher than +105°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
The coefficients of friction in dry operation are not as favourable with iglidur® F plain bearings as with various other iglidur® materials. However, iglidur® plain bearings can be lubricated without hesitation, and iglidur® F plain bearings achieve excellent results in the comparison of lubricated iglidur® bearings with each other.

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

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

iglidur® F

Dry

Grease

Oil

Water

Coefficients of friction µ

0.1 - 0.39

0.09

0.04

0.04

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

Wear, rotating application with different shaft materials

Diagram 06: Wear, rotating application with different 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-chromed
E = HR carbon steel
F = 304 stainless steel
G = high grade steel

Shaft materials
Diagrams 06 and 07 show an excerpt of the results of tests with different shaft materials that were carried out with plain bearings made of iglidur® F. In the lowest load range, the hard-chrome plated shaft proves to be the most favourable mating partner in rotating applications with iglidur® F plain bearings.

Shaft materials
Wear for oscillating and rotating

Diagram 07: Wear in oscillating and rotating applications with different shaft materials, p = 2MPa

Y = wear [μm/km]

A = CF53
B = hard-chromed
C = 304 stainless steel
D = HR carbon steel

blue = rotating
pink = oscillating

Medium

Resistance

Alcohols

+ to 0

Hydrocarbons

Greases, oils, with no additives

Fuels

Diluted acids

0 to -

Strong acids

-

Dilute bases

Strong bases

+ to 0

+ resistant      0 conditionally resistant      - non-resistant
All data at room temperature [+20 °C]
Table 05: Chemical resistance of iglidur® F

Chemical resistance
iglidur® F plain bearings have a good chemical resistance. The particularly high resistance to lubrication must be emphasised, even at high temperatures (around +120°C). Therefore, iglidur® F plain bearings are particularly suitable for applications that - perhaps due to other components - must run with lubrication. iglidur® F is not affected by most weak organic and inorganic acids.

**
Electrical specification**

Specific volume resistance

> 103Ωcm

Surface resistance

> 102Ω

Radioactive rays
Plain bearings made of iglidur® F are resistant to radiation up to a radiation intensity of 3 x 102Gy.

Maximum moisture absorption

at +23°C/50% room humidity

1.8% weight

Max. total moisture absorption

8.4% weight

Table 06: Moisture absorption of iglidur® F

Moisture absorption
The moisture absorption of iglidur® F plain bearings is about 1.8% in a normal climate. The saturation limit in water is 8.4%. This must be taken into account under appropriate operating conditions.

Influence of moisture absorption

Diagram 10: Influence of moisture absorption

X = moisture absorption [Gew.-%]
Y = reduction of inner ø [%]

Diameter
d1 [mm]

Shaft h9
[mm]

iglidur® F
D11 [mm]

Housing H7
[mm]

up to 3

0 - 0.025

+0.020 +0.080

0 +0.010

> 3 to 6

0 - 0.030

+0.030 +0.105

0 +0.012

> 6 to 10

0 - 0.036

+0.040 +0.130

0 +0.015

> 10 to 18

0 - 0.043

+0.050 +0.160

0 +0.018

> 18 to 30

0 - 0.052

+0.065 +0.195

0 +0.021

> 30 to 50

0 - 0.062

+0.080 +0.240

0 +0.025

> 50 to 80

0 - 0.074

+0.100 +0.290

0 +0.030

Table 07: Important tolerances for iglidur® F plain bearings according to ISO 3547-1 after press-fit

Installation tolerances
iglidur® F plain bearings are standard bearings for shafts with h-tolerance (recommended minimum h9). The bearings are designed for press-fit into a housing machined to a H7 tolerance. After being assembled into a nominal size housing, the inner diameter automatically adjusts to the D11 tolerances. For particular dimensions the tolerance differs depending on the wall thickness (please see product range).

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