iglidur® A180 - Material data

Material data table

General properties	Unit	iglidur® A180	Testing method
Density	g/cm³	1.46
Colour		white
Max. moisture absorption at +23°C/50% room humidity	% weight	0.2	DIN 53495
Max. moisture absorption	% weight	1.3
Coefficient of sliding friction, dynamic against steel	µ	0,05 - 0,23
pv value, max. (dry)	MPa x m/s	0.31
Mechanical properties
Flexural modulus	MPa	2,300	DIN 53457
Flexural strength at 20°C	MPa	88	DIN 53452
Compressive strength	MPa	78
Maximum recommended surface pressure (20°C)	MPa	28
Shore D hardness		76	DIN 53505
Physical and thermal properties
Max. long-term application temperature	°C	+90
Max. short-term application temperature	°C	+110
min. 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	11	DIN 53752
Electrical properties
Specific transitional resistance	Ωcm	> 10¹²	DIN IEC 93
Surface resistance	Ω	> 10¹¹	DIN 53482

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diagram. 01: Permissible pv value for iglidur® A180 plain bearings

Plain bearings made from iglidur® A180 are suitable for application in direct contact with food. They are the ideal solution for bearing points on machines for the food and packaging industry, medical equipment manufacturing, small household appliances, etc. Even where wet cleaning contact occurs, the iglidur® A180 is characterised by the lowest moisture absorption.

diagram. 02: maximum recommended surface pressure as a function of temperature (20 MPa at +20 °C)

Mechanical specification

The maximum recommended surface pressure is a mechanical material parameter. It cannot be used to draw conclusions about the tribology. The compressive strength of iglidur® A180 plain bearings decreases with increasing temperatures. diagram. 02 illustrates this relationship.

diagram. 03 shows the elastic deformation of iglidur® A180 under radial load. Under the maximum recommended surface pressure of 20 MPa, the deformation is less than 2.5 %. Plastic deformation can be neglected up to this radial load. However, it is also dependent on the duration of the impact.

Diagram 03: Deformation under pressure and temperature

Further information

load, surface pressure

Permissible gliding speeds

iglidur® A180 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 an increase up to the permanently permissible temperature. In practice, these limit values cannot always be achieved due to interactions.

Maximum surface speed

m/s	Rotating	Oscillating	linear
permanent	0.8	0.6	3.5
Short-term	1.2	1	5

Surface Speedp x v value and lubrication

Temperatures

The upper short-term application temperature is +110 °C. The compressive strength of iglidur® A180 plain bearings decreases with increasing temperatures. diagram. 02 illustrates this relationship. The temperatures prevailing in the bearing system also have an influence on bearing wear. Additional protection is required at temperatures higher than +60 °C.

iglidur® A180	Application temperature
Minimum	- 50 °C
Max. long-term	+90°C
Maximum, short-term	+110°C
In addition secure axially from	+60°C

Temperatures, coefficient of thermal expansion

Diagram 04: Coefficient of friction as a function of the surface speed, p = 0.75MPa

friction and wear

The coefficient of friction and wear resistance change with the application parameters. With increasing load, however, the coefficient of friction decreases significantly (diagrams 04 and 05).

coefficient of friction for iglidur® A180 against steel (Ra = 1 μm, 50 HRC):

iglidur® A180	dry	Greases	Oil	Water
Coefficients of friction µ	0,05 - 0,23	0.09	0.04	0.04

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

Further information:

Coefficient of frictionWear resistance

diagram. 06: Wear, rotating application with different

Shaft materials

Diagram 06 shows test results with different shaft materials that were carried out with plain bearings made from iglidur® A180. The combination "iglidur® A180/hard-anodised aluminium shaft" clearly stands out. However, good to very good wear rates are also achieved on other shafts. On Cf53 shafts, the higher wear in swivelling applications compared to rotation is exemplary (diagram. 07).

Shaft materials

diagram. 07: Wear with oscillating and rotating

Chemical resistance

iglidur® A180 plain bearings can be used under a wide range of ambient conditions and in contact with numerous chemicals. Table 05 provides an overview of the chemical resistance of iglidur® A180 plain bearings at room temperature.

+ resistant 0 conditionally resistant - not resistant
All data at room temperature [+20 °C]

Medium	Resistance
Alcohols	+
Hydrocarbons	+
Greases, oils without additives	+
Fuels	+
Diluted acids	0 to -
Strong acids	-
Diluted alkalines	+
Strong alkalines	+ up to 0

Radioactive radiation

Bearings made from iglidur® A180 are resistant to radiation up to a radiation intensity of 3 x 10² Gy. Higher radiation levels attack the material and can lead to the loss of important mechanical specifications.

UV resistance

iglidur® A180 plain bearings are resistant to UV radiation, but the tribological specification deteriorates due to permanent exposure.

Vacuum

When used in a vacuum, any moisture content will outgas. Therefore, only dry bearings are suitable for vacuum.

Electrical specification

iglidur® A180 plain bearings are electrically insulating.

Electrical properties
Specific transitional resistance	> 10¹² Ωcm
Surface resistance	> 10¹¹ Ω

Moisture absorption

The iglidur® A180 bearings absorb up to 0.2 % water due to humidity (+23 °C, 50 % relative humidity), and up to 1.3 % when saturated with water.

Maximum moisture absorption
at +23 °C/50 % r. humidity	0.2% weight
Max. moisture absorption	1.3% weight

Installation tolerances

iglidur® A180 plain bearings are standard bearings for shafts with h-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 automatically.

Diameter d1 [mm]	Shaft h9 [mm]	iglidur® A180 F10 [mm]	Housing H7 [mm]
up to 3	0 - 0.025	+0.014 +0.054	0 +0.010
> 3 up to 6	0 - 0.030	+0.020 +0.068	0 +0.012
> 6 up to 10	0 - 0.036	+0.025 +0.083	0 +0.015
> 10 up to 18	0 - 0.043	+0.032 +0.102	0 +0.018
> 18 up to 30	0 - 0.052	+0.040 +0.124	0 +0.021
> 30 up to 50	0 - 0.062	+0.050 +0.150	0 +0.025