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iglidur® F - Material data

Material table

General specification

Unit

iglidur® F

Test method

density

g/cm³

1,25

Colour

black colour

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

% by weight

1,8

DIN 53495

max. total moisture absorption

wt.-%

8,4

Sliding friction coefficient, dynamic, against steel

µ

0,1 - 0,39

pv value, max. (dry)

MPa x m/s

0,34

Mechanical specification

flexural 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 specification

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 specification

Volume resistivity

Ωcm

< 103

DIN IEC 93

surface resistance

Ω

< 102

DIN 53482

Table 01: Material data

diagram. 01: Permissible pv value for iglidur® F 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]

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 105MPa.

diagram. 02: maximum recommended surface pressure as a function of temperature (105 MPa at +20 °C)

X = temperature [°C]
Y = load [MPa]

Mechanical specification
The maximum recommended surface pressure represents a mechanical material parameter. 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 50 MPa.

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

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 sliding speeds
The maximum permissible sliding 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 bearings is 0.8 m/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

below

- 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 temperature has a strong influence on the properties of plain bearings. As temperatures rise, 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 bearings as with various other iglidur® materials. However, iglidur®® bearings can be lubricated without hesitation, and in comparison with lubricated iglidur®® bearings, iglidur®® F bearings achieve excellent results.

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

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

iglidur® F

Dry

Fat

oil

water

coefficient of friction µ

0,1 - 0,39

0,09

0,04

0,04

Table 04: coefficient of friction for iglidur® F 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
Diagrams 06 and 07 show an extension of the results of tests with different shaft materials carried out with plain bearings made from iglidur® F. In the lowest load range, the hard-chrome plated shaft proves to be the most favourable mating partner for 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 = 2 MPa

Y=wear [μm/km]

A= CF53
B= hard chrome-plated
C= 304 SS
D= HR carbon steel

blue= rotating
pink= oscillating

Medium

Resistance

Alcohols

+ to 0

Hydrocarbons

Greases, oils, not additivated

fuels

Diluted acids

0 to -

strong acids

-

Dilute bases

strong bases

+ to 0

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

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

**
Electrical specification

Volume resistivity

< 103 Ωcm

surface resistance

< 102 Ω

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

Maximum moisture absorption

at +23 °C/50 % room humidity.

1.8 % by weight

max. total moisture absorption

8.4 % by weight

Table 06: Moisture absorption of iglidur® F

Moisture absorption
The moisture absorption of iglidur® F 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 inside ø [%]

Diameter****d1 [mm]

shaft h9**[mm]**

iglidur® F****D11 [mm]

housing H7**[mm]**

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-fitting

Installation tolerances
iglidur® F plain bearings are standard bearings for shafts with tolerance (recommended minimum h9).the bearings are designed for press-fitting into aH7-toleranced mounting. After installation in a mounting with nominal dimensions, the inner diameter of the bearing with D11 tolerance is automatically adjusted; for certain dimensions, the tolerance deviates from this depending on the wall thickness (see product range).

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