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iglidur® B - Material data

Material table

General specification

Unit

iglidur® B

Test method

density

g/cm³

1,15

Colour

grey

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

% by weight

1,0

DIN 53495

max. total moisture absorption

wt.-%

6,3

Sliding friction coefficient, dynamic, against steel

μ

0,18-0,28

pv value, max. (dry)

MPa x m/s

0,15

Mechanical specification

flexural modulus

MPa

1.800

DIN 53457

flexural strength at 20°C

MPa

55

DIN 53452

Compressive strength

MPa

20

maximum recommended surface pressure (20°C)

MPa

40

Shore D hardness

69

DIN 53505

Physical and thermal specification

Upper long-term application temperature

°C

+100

upper short-term application temperature

°C

+130

Lower application temperature

°C

-40

thermal conductivity

W/m x K

0,24

ASTM C 177

coefficient of thermal expansion (at 23°C)

K-1 x 10-5

12

DIN 53752

Electrical specification

Volume resistivity

Ωcm

> 1010

DIN IEC 93

surface resistance

Ω

> 109

DIN 53482

Table 01: Material data

diagram. 01: Permissible pv value for iglidur® B 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 compressive strength of the iglidur® B bearings is low, but this is an important property of the bearing. They are mainly used where vibration dampening and acoustic decoupling are required.

diagram. 02: maximum recommended surface pressure as a function of temperature (40 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® B plain bearings decreases with increasing temperatures. diagram 02 illustrates this relationship.

Diagram 03: Deformation under pressure and temperature

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

The deformation at 40 MPa under room temperature is5.3 % (diagram. 03).

Maximum surface speed

m/s

rotating

oscillating

linear

continuous

0,7

0,5

2

short-term

1

0,7

3

Table 02: Maximum surface speed

Permissible sliding speeds
iglidur® B bearings can be used continuously rotating up to 0.7 m/sec. The frictional heat specifies the limits for the speeds.

Due to interactions, the specified maximum values can often not be realised in practice.

iglidur® B

Application temperature

lower

- 40 °C

upper, long-term

+ 100 °C

upper, short-term

+ 130 °C

additional axial protection from

+ 50 °C

Table 03: Temperature limits for iglidur® B

Temperatures
The operating temperature of the iglidur® B bearings is limited to 100°C. From 50°C, the very soft bearing should be additionally secured mechanically so that there is no risk of the bushings moving out of the hole. The wear resistance also decreases disproportionately from 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
The coefficient of friction increases slightly with the speed and decreases with the load. Shaft roughnesses between 0.4 and 0.6 Ra are ideal. As long as the bearing load is not too high, the wear values achieved are quite good. An increase in load results in a disproportionate increase in wear.

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

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

iglidur® B

Dry

Grease

oil

water

coefficient of friction µ

0,18 - 0,28

0,09

0,04

0,04

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

Wear information

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
The influence of the shaft material on wear resistance is not very great.

Diagrams 06 and 07 illustrate that very similar wear data can be achieved with different shaft materials. If high running performance is expected, the load on the bearing should not be too high.

Shaft materials
Wear information

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

X = load [MPa]
Y = wear [μm/km]

A = rotating
B = swivelling

Medium

Resistance

Alcohols

+ to 0

Hydrocarbons

-

Greases, oils, not additivated

-

fuels

-

Diluted acids

0 to -

strong acids

-

Dilute bases

-

strong bases

-

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

Chemical resistance
iglidur® B bearings are not very resistant to chemicals, but if chemical resistance is important, other iglidur®materials with better specifications are available.

**
Electrical specification

Volume resistivity

> 1010 Ωcm

surface resistance

> 109 Ω

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

Maximum moisture absorption

at +23 °C/50 % room humidity.

1.0 % by weight

max. total moisture absorption

6.3 % by weight

Table 06: Moisture absorption of iglidur® B

Moisture absorption
Moisture absorption is relatively high and must be taken into account in both selection and design.

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® B****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® B plain bearings according to ISO 3547-1 after press-fitting

Installation tolerances
iglidur® B bearings are standard bearings for shafts with tolerance (recommended minimum h9).

The bearings are designed for press-fitting into a h7-toleranced mounting. After installation in a mounting with nominal dimensions, the inner diameter of the bearing with D11 tolerance adjusts itself. For certain dimensions, the tolerance deviates depending on the wall thickness (see product range).

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