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iglidur® B material data - no longer available

Material data table

General properties

Unit

iglidur® B

Testing method

Density

g/cm³

1.15

Colour

grey

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

% weight

1.0

DIN 53495

Max. moisture absorption

% weight

6.3

Coefficient of sliding friction, dynamic against steel

μ

0.18-0.28

pv value, max. (dry)

MPa x m/s

0.15

Mechanical properties

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 properties

Max. long-term application temperature

°C

+100

Max. short-term application temperature

°C

+130

Min. 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 properties

Specific transitional resistance

Ωcm

>1,010

DIN IEC 93

Surface resistance

Ω

>109

DIN 53482

Table 01: Material data

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

X = Surface speed [m/s]
Y = Load [MPa]

The compressive strength of the iglidur® B plain bearings is on the one hand low, but on the other, is an important property of the bearing. They are mainly used where vibration dampening and acoustic separation are required.

Diagram. 02: Maximum recommended surface pressure as a function of temperature (40MPa at +20°C)

X = Temperature [°C]
Y = Load [MPa]

Mechanical specifications
The maximum recommended surface pressure represents mechanical material parameter. No conclusions regarding the tribological properties can be drawn from this. With increasing temperatures, the compressive strength of iglidur® B plain bearings decreases. Diagram 02 shows this relationship.

Diagram 03: Deformation under pressure and temperature

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

The deformation under a pressure of 40MPa at room temperature amounts to 5.3% (Diagram 03).

Maximum surface speed

m/s

Rotating

Oscillating

Linear

permanent

0.7

0.5

2

Short-term

1

0.7

3

Table 02: Maximum surface speeds

Permissible surface speeds
iglidur® B plain bearings can be continuously used at up to 0.7m/s in rotating applications. The frictional heat determines the speed limits.

Due to reciprocal effects, the specified maximum values often cannot be achieved in practice.

iglidur® B

Application temperature

Minimum

-40°C

Maximum, long-term

+100°C

Maximum, short-term

+130°C

In addition secure axially from

+50°C

Table 03: Temperature limits for iglidur® B

Temperatures
The operating temperature of iglidur® B plain bearings is limited to +100°C. From as low as +50°C, these very soft bearings should also be mechanically secured so that the bushings do not move 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 surface finishes between 0.4 and 0.6Ra are ideal. As long as the bearing load is not too high, the attained coefficient of wear is pretty good. An increase in load results in a disproportionate increase in abrasion.

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

Greases

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 = 1µm, 50HRC)

Wear information

Diagram 07: Wear in pivoting and rotating applications with Cf53 depending on the load

X = load [MPa]
Y = wear [μm/km]

A = rotating
B = pivoting

Medium

Resistance

Alcohols

+ up to 0

Hydrocarbons

-

Greases, oils without additives

-

Fuels

-

Diluted acids

0 to -

Strong acids

-

Diluted alkalines

-

Strong alkalines

-

+ resistant      0 partially resistant      - non-resistant
All information applies to room temperature [+20 °C]
Table 05: Chemical resistance of iglidur® B

Chemical resistance
iglidur® B plain bearings are not very chemical-resistant. If chemical resistance is important, other iglidur® materials with better specifications are available.

**
Electrical specifications**

Specific transitional resistance

>1,010Ωcm

Surface resistance

>109Ω

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

Maximum moisture absorption

at +23°C/50% r. humidity

1.0% weight

Max. moisture absorption

6.3% weight

Table 06: Moisture absorption of iglidur® B

Moisture absorption
The moisture absorption is relatively high and must be taken into account during selection and design.

Influence of moisture absorption

Diagram 10: Influence of moisture absorption

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

Diameter
d1[mm]

Shaft h9
[mm]

iglidur® B
D11[mm]

Housing H7
[mm]

up to 3

0 - 0.025

+0.020 +0.080

0 +0.010

> 3 up to 6

0 - 0.030

+0.030 +0.105

0 +0.012

> 6 up to 10

0 - 0.036

+0.040 +0.130

0 +0.015

> 10 up to 18

0 - 0.043

+0.050 +0.160

0 +0.018

> 18 up to 30

0 - 0.052

+0.065 +0.195

0 +0.021

> 30 up 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-fit

Assembly tolerances
iglidur® B plain bearings are the standard 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 table).

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