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iglidur® R - Material data

Material table

General specification

Unit

iglidur® R

Test method

density

g/cm³

1,39

Colour

dark red

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

% by weight

0,2

DIN 53495

max. total moisture absorption

wt.-%

1,1

Sliding friction coefficient, dynamic, against steel

µ

0,09 - 0,25

pv value, max. (dry)

MPa x m/s

0,27

Mechanical specification

flexural modulus

MPa

1.950

DIN 53457

flexural strength at 20°C

MPa

70

DIN 53452

Compressive strength

MPa

68

maximum recommended surface pressure (20°C)

MPa

23

Shore D hardness

77

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

> 1012

DIN IEC 93

surface resistance

Ω

> 1012

DIN 53482

Table 01: Material data

diagram. 01: Permissible pv value for iglidur® R 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® R as a plain bearing material, the focus was on high performance and a very low price. In particular, low friction and wear values were to be achieved in dry operation. The PTFE- and silicone-free material achieves outstandingly low coefficients of friction 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 represents a mechanical material parameter. It is not possible to draw conclusions about the tribology from this. the compressive strength of iglidur® R plain bearings decreases with increasing temperatures. diagram 02 illustrates this relationship.

Diagram 03: Deformation under pressure and temperature

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

diagram. 03 shows the elastic deformation of iglidur® R under radial load. Under the maximum permissible load of 23 MPa, the deformation is 4 %. Plastic deformation can be neglected up to this value. However, it also depends on the duration of the load.

Maximum surface speed

m/s

rotating

oscillating

linear

continuous

0,8

0,6

3,5

short-term

1,2

1

5

Table 02: Maximum surface speed

Permissible sliding speeds
iglidur® R 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 causes an increase up to the limit of the permanently permissible temperature.

iglidur® R

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 for iglidur® R

Temperatures
The compressive strength of iglidur® R 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 with increasing load, as does the wear resistance. iglidur® R is particularly suitable for applications in which high pv values are mainly caused by the high surface speed and not so much by the surface pressure. The dependence of the coefficient of friction of iglidur® R plain bearings on shaft roughness is less pronounced.

diagram 05: coefficient of friction as a function of the load

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

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

diagram. 06: Wear, rotating application with different shaft materials

diagram. 06: Wear, rotating application with different shaft materials, load 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® R. At 0.3 m/s and 1 MPa, the high grade steel and Cf53 shafts are the best sliding partners. With increasing load, iglidur®®R-bearing with Cf53 and 304 SS shafts show the best wear behaviour, while hard chrome-plated shafts prove to be a good sliding partner in swivel operation.
If the shaft material you intend to use is not included in the test results presented here, please contact us.

Shaft materials
diagram. 07: Wear in swivelling and oscillating applications

diagram. 07: Wear in swivelling and oscillating applications at constant load with different shaft materials, p = 2 MPa

X = load [MPa]
Y = wear [μm/km]

A = Cf53
B = hard chrome plated
C = 304 SS
D = HR carbon steel

pink = rotating
blue = 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

Table 05: chemical resistance of iglidur® R

Chemical resistance
iglidur® R plain bearings can be used under a wide range of ambient conditions and in contact with numerous chemicals. Table 05 provides an overview of the chemical resistance of iglidur® R plain bearings at room temperature.

**
Electrical specification

Volume resistivity

> 1012 Ωcm

surface resistance

> 1012 Ω

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

Maximum moisture absorption

at +23°C/50% room humidity.

0.2% by weight

max. total moisture absorption

1.1 % by weight

Table 06: Moisture absorption of iglidur® R

Moisture absorption
The moisture absorption of iglidur® R bearings is about 0.2 % in a normal climate. The saturation limit in water is 1.1 %. 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® R****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 for iglidur® R plain bearings according to ISO 3547-1 after press-fitting

Installation tolerances
iglidur® R 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 adjusts itself. For certain dimensions, the tolerance deviates from this depending on the wall thickness (see product range).

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