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iglidur® D - Material data

Material table

General specification

Unit

iglidur® D

Test method

density

g/cm³

1,40

Colour

green colour

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

% by weight

0,3

DIN 53495

max. total moisture absorption

wt.-%

1,1

Sliding friction coefficient, dynamic, against steel

µ

0,08 - 0,26

pv value, max. (dry)

MPa x m/s

0,27

Mechanical specification

flexural modulus

MPa

2.000

DIN 53457

flexural strength at 20°C

MPa

72

DIN 53452

Compressive strength

MPa

70

maximum recommended surface pressure (20°C)

MPa

23

Shore D hardness

78

DIN 53505

Physical and thermal specification

Upper long-term application temperature

°C

+90

upper short-term application temperature

°C

+110

Lower application temperature

°C

-50

thermal conductivity

W/m x K

0,25

ASTM C 177

coefficient of thermal expansion (at 23°C)

K-1 x 10-5

11

DIN 53752

Electrical specification

Volume resistivity

Ωcm

> 1014

DIN IEC 93

surface resistance

Ω

> 1014

DIN 53482

Table 01: Material data

diagram. 01: Permissible pv value for iglidur® D plain bearings
diagram. 01: Permissible pv value for iglidur® D plain bearings

diagram. 01: Permissible pv value for iglidur® D 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 developing iglidur® D as a plain bearing material, a very low price was at the top of the requirements profile. In addition, low coefficients of friction were to be achieved in dry operation, especially at high speeds. The silicone-containing material also achieves outstandingly low friction values in dry operation and runs largely stick-slip-free.

diagram. 02: maximum recommended surface pressure as a function of temperature (23 MPa at +20 °C)

X = temperature [°C]
Y = load [MPa]

Mechanical specification
The maximum recommended surface pressure is a mechanical material parameter. It cannot be used to draw conclusions about tribology. The compressive strength of iglidur® D plain bearings decreases with increasing temperatures. diagram. 02 illustrates this relationship.

Diagram 03: Deformation under pressure and temperature

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

iglidur® D bearings were mainly developed for low radial loads. diagram.03 shows the elastic deformation of iglidur® D under radial load. Under the maximum recommended surface pressure of 23 MPa, the deformation is approx. 3%. Plastic deformation can be neglected up to this value. However, it also depends on the duration of the impact.

m/s

rotating

oscillating

linear

continuous

1,5

1,1

8

short-term

3

2,1

10

Table 02: Maximum surface speed

Permissible sliding speeds
iglidur® D plain bearings are suitable for high sliding speeds; for linear movements, short-term speeds of up to 10 m/s are permissible! Here too, the specified maximum values can only be achieved under the lowest pressure loads. The specified values show the speed at which friction leads to an increase up to the limit of the permanently permissible temperature.

iglidur® D

Application temperature

lower

- 50 °C

upper, long-term

+ 90 °C

upper, short-term

+ 110 °C

additional axial protection from

+ 50 °C

Table 03: Temperature limits

Temperatures
The compressive strength of iglidur® D plain bearings decreases with increasing temperatures. diagram 02 illustrates this correlation. The temperatures prevailing in the bearing system also have an influence on bearing wear, and additional protection is required at temperatures higher than +50 °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 coefficient of friction decreases in the same way as the wear resistance of the load to be carried. The coefficient of friction reaches its optimum in the Ra range between 0.4 and 0.6 μm.

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

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

iglidur® D

Dry

Fat

oil

water

coefficient of friction µ

0,08 - 0,26

0,09

0,04

0,04

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

diagram. 06: Wear, rotating application with different

diagram. 06: Wear, rotating application with different shaft materials, p = 1 MPa, v = 0.3 m/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 that were carried out with plain bearings from iglidur® D.

If your intended shaft material is not included in this list, please contact us.

Wear information

diagram. 07: Wear in swivelling 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

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® D

Chemical resistance
iglidur® D bearings are resistant to very weak acids, diluted alkalis, fuels and all types of lubricants.

**
Electrical specification

Volume resistivity

> 1014 Ωcm

surface resistance

> 1014 Ω

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

Maximum moisture absorption

at +23 °C/50 % room humidity.

0.3 % by weight

max. total moisture absorption

1.1 % by weight

Table 06: Moisture absorption of iglidur® D

Moisture absorption
The moisture absorption of iglidur® J bearings is about 0.3 % in a normal climate. The saturation limit in water is 1.1 %. This low moisture absorption also permits use in a wet environment.

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® D****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® D 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 E10 tolerance is automatically adjusted.

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