iglidur® A200 - Material data

Material table

General specification

Unit

iglidur® A200

Test method

density

g/cm³

1,14

Colour

white

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

% by weight

1,5

DIN 53495

max. total moisture absorption

wt.-%

7,6

Sliding friction coefficient, dynamic, against steel

0,10 - 0,40

pv value, max. (dry)

MPa x m/s

0,09

Mechanical specification

flexural modulus

MPa

2.500

DIN 53457

flexural strength at 20°C

MPa

116

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

+80

Upper short-term application temperature

°C

+170

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]

DIN 53752

Electrical specification

Volume resistivity

Ωcm

> 1013

DIN IEC 93

surface resistance

> 1012

DIN 53482

Table 01: Material data

Download data sheet

Plain bearings made from iglidur® A200 are suitable for use in direct contact with food. They are therefore the ideal solution for bearing points on machines for the food industry, medical equipment, small household appliances and others. Furthermore, iglidur® A200 is characterised by its ability to embed dirt and its quiet running behaviour. The high abrasion resistance, insensitivity to dirt and the ability to dry operate make it possible to dispense with the usual, costly encapsulation of lubricated bearings.

Mechanical specification
The maximum recommended surface pressure represents a mechanical material parameter. No conclusions can be drawn from this about the tribology. the compressive strength of iglidur® A200 plain bearings decreases with increasing temperatures. diagram. 02 illustrates this relationship.

diagram. 03 shows the elastic deformation of iglidur® A200 under radial load. Under the maximum recommended surface pressure of 18 MPa, the deformation is less than 2 %. Plastic deformation can be neglected up to this radial load. However, it also depends on the duration of the load.

m/s

rotating

oscillating

linear

continuous

0,8

0,6

short-term

1,5

1,1

Table 02: Maximum surface speed

Permissible sliding speeds
iglidur® A200 has been developed for low sliding speeds. In dry operation, a maximum of 0.8 m/s (rotating) or 2 m/s (linear) is permitted for continuous operation. these specified values 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® A200

Application temperature

lower

- 40 °C

upper, long-term

+ 80 °C

upper, short-term

+ 170 °C

additional axial protection from

+ 50 °C

Table 03: Temperature limits for iglidur® A200

Temperatures
The maximum permissible short-term temperature is +170 °C. The compressive strength of iglidur® A200 bearings decreases with increasing temperatures. diagram 02 illustrates this correlation. The temperatures prevailing in the bearing system also have an influence on bearing wear. Additional protection is required at temperatures higher than +50 °C.

Friction and wear
The coefficient of friction changes with increasing load, as does the wear resistance (diagrams 04 and 05).

iglidur® A200

dry

Grease

oil

water

coefficient of friction µ

0,1 - 0,4

0,09

0,04

Table 04: coefficient of friction for iglidur® A200 against steel (Ra = 1 μm, 50 HRC)

diagram. 06: Wear, rotating application with different

Shaft materials
The diagrams 06 and 07 show test results with different shaft materials, which were carried out with bearings made of iglidur® A200. With swivelling movements under a load p = 2 MPa, the wear of iglidur® A200 bearings is higher than with rotations under the same load. The shaft made of HR carbon steel is the positive exception here.

Shaft materials

diagram. 07: Wear with rotating and oscillating

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® A200

Chemical resistance
iglidur® A200 plain bearings have good resistance to cleaning agents, greases, oils, alkalis and weak acids.

**
Electrical specification

Volume resistivity

> 1013 Ωcm

surface resistance

> 1012 Ω

Radioactive radiation
Bearings made from iglidur® A200 are resistant to radiation up to a radiation intensity of 1 x 104 Gy. Higher radiation levels attack the material and can lead to the loss of important mechanical specifications.

Maximum moisture absorption

at +23 °C/50 % room humidity.

1.5 % by weight

max. total moisture absorption

7.6 % by weight

Table 06: Moisture absorption

The moisture absorption of iglidur® A200 bearings is about 1.5 % in a normal climate. The saturation limit in water is 7.6 %. This must be taken into account under appropriate operating conditions.

Diameter****d1 [mm]

shaft h9**[mm]**

iglidur® A200****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

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

Installation tolerances
iglidur® A200 plain bearings are standard bearings for shafts with tolerance (recommended at least s h9).
The bearings are designed to be pressed into aH7-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 from this depending on the wall thickness (see product range).