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iglidur® AB - Material data

Material table

General specification

Unit

iglidur® AB

Test method

density

g/cm³

1,11

DIN EN ISO 1183-1

Colour

yellow

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

% by weight

0,8

ISO 175

max. total moisture absorption

wt.-%

1,6

ISO 62

Sliding friction coefficient, dynamic, against steel

µ

0,18 - 0,31

pv value, max. (dry)

MPa x m/s

0,25

Mechanical specification

flexural modulus

MPa

1.850

DIN EN ISO 178

flexural strength at 20°C

MPa

50

DIN EN ISO 178

Compressive strength

MPa

40

maximum recommended surface pressure (20°C)

MPa

25

Shore D hardness

70

DIN 53505

Physical and thermal specification

Upper long-term application temperature

°C

+70

Upper short-term application temperature

°C

+140

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]

10

DIN 53752

Electrical specification

Volume resistivity

Ωcm

> 1012

DIN IEC 93

surface resistance

Ω

> 1012

DIN 53482

Table 01: Material data

Permissible pv value for iglidur® W300
Permissible pv value for iglidur® W300

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

iglidur® AB was specially developed for applications in areas with high hygiene requirements. Such applications often involve manually operated swivels (doors, medical furniture, etc.). The material reduces the germ load in the bearing gap, but - like all "antibacterial" materials - is no substitute for appropriate hygiene measures.

diagram. 02

Diagram 02: Recommended maximum surface pressure of a function of temperature (60 MPa at +20 °C)

X = temperature [°C]
Y = load [MPa]

Mechanical specification
The compressive strength of iglidur® AB plain bearings decreases with increasing temperatures. The maximum recommended surface pressure is a mechanical material parameter. No conclusions can be drawn about the tribology.

diagram. 03: Deformation

Diagram 03: Deformation under pressure and temperature

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

diagram. 03 shows the elastic deformation of iglidur® AB under radial load. Possible plastic deformation depends, among other things, on the duration of the load.

Maximum surface speed

m/s

rotating

oscillating

linear

continuous

0,7

0,5

1,0

short-term

1,0

0,7

1,8

Table 03: Maximum surface speed

Permissible sliding speeds
iglidur® AB is predominantly suitable for low sliding speeds in dry operation, whereby the limit values specified in Table 03 can only be achieved at very low pressure loads. At the specified speeds, friction can lead to an increase up to the limit of the permanently permissible temperature. In practice, these limit values cannot always be achieved due to the interaction of various influences.

Temperatures
The temperatures prevailing in the bearing system also have an influence on bearing wear. Wear increases with rising temperatures, and the effect is particularly noticeable from a temperature of +60 °C. An additional fuse is required at temperatures above +50 °C.

iglidur® AB

dry

Grease

oil

water

coefficient of friction µ

0,11 - 0,21

0,09

0,04

0,04

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

friction and wear
The coefficient of friction and wear resistance depend on the application parameters (diagrams 04 and 05).

diagram. 04

diagram. 04: coefficient of friction as a function of the surface speed, p = 0.75 MPa, shaft from Cf53

X = surface speed [m/s]
Y = coefficient of friction μ

diagram. 05

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

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

Wear with different shaft materials

diagram. 06: Wear 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
Friction and wear are also highly dependent on the mating partner. Shafts that are too smooth increase both the coefficient of friction and the wear of the bearing.diagram. 06 shows an extension of the results of tests with different shaft materials. When rotating with a load of 1 MPa, the wear on all the shafts tested is very similar. Only the hard-anodised aluminium shafts lead to noticeably increased wear. The wear rate in swivelling and rotation with increasing load is also very close to each other with otherwise identical parameters, as shown in diagram 07.

Shaft materials
Wear in oscillating and rotating applications

diagram. 07: Wear in oscillating and rotating applications with shaft material Cf53 as a function of the load

X = load [MPa]
Y = wear [μm/km]

A = rotating
B = oscillating

Medium

Resistance

Alcohols

+ to 0

Hydrocarbons

Greases, oils, not additivated

fuels

Diluted acids

0 to -

strong acids

-

Dilute bases

strong bases

0

+ resistant 0 conditionally resistant - not resistant
All data at room temperature [+20 °C]Table 05: chemical resistance of iglidur® W300

**
Electrical specification

Volume resistivity

> 1013 Ωcm

surface resistance

> 1012 Ω

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

Maximum moisture absorption

at +23 °C/50 % room humidity.

0.2 % by weight

max. total moisture absorption

0.4 % by weight

Table 06: Moisture absorption

Moisture absorption
The moisture absorption of iglidur® AB bearings is about 0.8% by weight in a normal climate. The saturation limit in water is 1.6% by weight.

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® AB****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

Table 07: Important tolerances according to ISO 3547-1 after press-fitting

Installation tolerances
iglidur® AB plain 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. Compared to the installation tolerance, the inner diameter changes depending on the moisture absorption; for certain dimensions, the tolerance deviates from this depending on the wall thickness (see product range).

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