iglidur® A181 - Material data

Material table

General specification

Unit

iglidur® A181

Test method

density

g/cm³

1,38

Colour

blue colour

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

% by weight

0,2

DIN 53495

max. total moisture absorption

wt.-%

1,3

Sliding friction coefficient, dynamic, against steel

0,10 - 0,21

pv value, max. (dry)

MPa x m/s

0,31

Mechanical specification

flexural modulus

MPa

1.913

DIN 53457

flexural strength at 20°C

MPa

DIN 53452

Compressive strength

MPa

maximum recommended surface pressure (20°C)

MPa

Shore D hardness

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]

DIN 53752

Electrical specification

Volume resistivity

Ωcm

< 1012

DIN IEC 93

surface resistance

< 1012

DIN 53482

Table 01: Material properties

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iglidur® Due to their technical properties and conformity with the relevant regulations, A181 plain bearings are predestined for applications in food technology. In terms of mechanical specification, temperature and media resistance, they are directly comparable with iglidur® A180, but iglidur® A181 is even better in terms of wear resistance in most constellations.

Mechanical specification
The compressive strength ofiglidur® A181 bearings decreases with increasing temperatures. diagram. 02 illustrates this correlation. The maximum recommended surface pressure represents a mechanical material parameter. Conclusions on the tribology cannot be drawn from this.

diagram. 03 shows the elastic deformation of iglidur® A181 under radial load.

m/s

rotating

oscillating

linear

continuous

0,8

0,6

3,5

short-term

1,2

1,0

5,0

Table 02: Maximum surface speed

Permissible sliding speeds
iglidur® A181 has been developed for low sliding speeds. In dry operation, a maximum of 0.8 m/s (rotating) or 3.5 m/s (linear) is permitted for continuous use.The values given in Table 02 indicate the limits at which frictional heat causes the temperature to rise to the permanently permissible temperature.In practice, these limit values cannot always be achieved due to interactions.

iglidur® A181

Application temperature

lower

- 50 °C

Upper, long-term

+ 90 °C

upper, short-term

+ 110 °C

additional axial protection from

+ 60 °C

Table 03: Temperature limits

Temperatures
The upper long-term application temperature of +90 °C enables a wide range of applications in the food sector. as diagram 02 shows, the compressive strength decreases with increasing temperatures. When considering temperatures, the additional frictional heat in the bearing system must be taken into account. An additional safety device is recommended at temperatures higher than +60 °C.

friction and wear
coefficient of friction and wear resistance change with the application parameters (diagram. 04 and 05). With iglidur®® A181 bearings, the change in the coefficient of friction μ as a function of surface speed and shaft roughness is only slightly pronounced.

iglidur® A181

dry

Grease

oil

water

coefficient of friction µ

0,10 - 0,21

0,08

0,03

0,04

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

diagram. 06: Wear, rotating application with different

Shaft materials
diagram. 06 shows an extension of the results of tests with different shaft materials that were carried out with iglidur®® A181 bearings. Special attention is paid to the corrosion-resistant shaft types for the food sector. diagram. 06 shows that low wear rates are achieved especially in combination with these shafts. As with many iglidur®® materials, the wear rate increases with otherwise identical parameters in rotation (diagram. 07).

Shaft materials

diagram. 07: Wear with oscillating and rotating

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 - unstable
All data at room temperature [+20 °C]
Table 05: chemical resistance

chemical resistance
iglidur® A181 plain bearings can be used under a wide range of environmental conditions and in contact with numerous chemicals. Table 05 provides an overview of the chemical resistance of iglidur® A181 plain bearings at room temperature.

**
Electrical specification

Volume resistivity

< 1012 Ωcm

surface resistance

< 1012 Ω

iglidur® A181 plain bearings are electrically insulating.

Radioactive radiation
Bearings made of iglidur® A181 are resistant to radiation up to a radiation intensity of 2 - 10² Gy.

Total moisture absorption for iglidur A181

Maximum moisture absorption

at +23 °C/50 % room humidity.

0.2 % by weight

max. total moisture absorption

1.3 % by weight

Table 06: Moisture absorption

Moisture absorption
The iglidur® A181 bearings absorb up to 0.2 % water due to humidity (+23 °C, 50 % relative humidity), and up to 1.3 % when saturated with water.

Diameter****d1 [mm]

shaft h9**[mm]**

iglidur® A181****F10 [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® A181 bearings are standard bearings for shafts with tolerance (recommended at least h9). The bearings are designed for press-fitting into an H7-toleranced mount; after installation in a mount with nominal dimension, the inner diameter of the bearing with E10 tolerance adjusts itself.