iglidur® P - Material data

Material table

General specification

Unit

iglidur® P

Test method

density

g/cm³

1,58

Colour

black colour

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

% by weight

0,2

DIN 53495

max. total moisture absorption

wt.-%

0,4

Sliding friction coefficient, dynamic, against steel

0,06 - 0,21

pv value, max. (dry)

MPa x m/s

0,39

Mechanical specification

flexural modulus

MPa

5.300

DIN 53457

flexural strength at 20°C

MPa

120

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

+130

Upper short-term application temperature

°C

+200

Lower application temperature

°C

-40

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

> 1013

DIN IEC 93

surface resistance

> 1012

DIN 53482

Table 01: Material data

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The iglidur® P bearings provide the user with cost-effective, maintenance-free plain bearings. Compared to iglidur® G, plain bearings made of iglidur® P are better suited for rotating movements and high loads.

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

diagram. 03 shows the elastic deformation of iglidur® P under radial load. Under the maximum recommended surface pressure of 50 MPa, the deformation is less than 4 %.

Maximum surface speed

m/s

rotating

oscillating

linear

continuous

0,7

short-term

1,4

Table 02: Maximum surface speed

Permissible sliding speeds
Bearings made of iglidur® P are maintenance-free bearings that have been developed for low to medium sliding speeds. the maximum values specified in Table 02 can only be achieved at very low surface pressure. The specified maximum speed is the speed at which friction can lead to an increase up to the permanently permissible temperature.

iglidur® P

Application temperature

below

-40°C

upper, long-term

+130°C

upper, short-term

+200°C

additional axial protection from

+90°C

Table 03: Temperature limits

Temperatures
Even with its highest long-term application temperature of +130 °C, iglidur® P does not quite come close to the values of iglidur® G. The temperatures prevailing in the bearing system also have an influence on the bearing wear; rising temperatures mean higher wear.

Friction and wear
The coefficient of friction decreases with increasing load, as does the wear resistance (diagrams 04 and 05). iglidur® P plain bearings reach a pronounced minimum coefficient of friction for shafts with a surface finish of 0.1 to 0.2 μm. Both smoother and rougher shafts increase the friction significantly.

iglidur® P

Dry

fat

oil

water

coefficient of friction µ

0,06 - 0,21

0,09

0,04

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

Shaft materials
diagram. 06 shows an extension of the results of tests with different shaft materials that were carried out with iglidur® P plain bearings. iglidur® P with Cf53 and HR carbon steel shafts exhibits very low wear during rotating movements. In contrast, the bearings are worn more heavily than other shaft materials, especially with hard chrome-plated shafts, even in the lower load range. At a load of 2 MPa, for example, Cf53 is six times superior to 304 SS. During swivelling movements, however, the "soft" HR carbon steel shaft is significantly less favourable than the hardened shaft materials or even than 304 SS shafts.

Shaft materials

Wear in pivoting and rotating applications

Medium

Resistance

Alcohols

hydrocarbons

Greases, oils, not additivated

fuels

Diluted acids

strong acids

diluted bases

strong bases

+ resistant 0 conditionally resistant - not resistant

All data at room temperature [+20 °C]
Table 05: chemical resistance of iglidur® P

Chemical resistance
iglidur® P bearings have good resistance to chemicals. They are resistant to most lubricants. iglidur® P is not attacked by most weak organic and inorganic acids.

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® P bearings is about 0.2 % in a normal climate. The saturation limit in water is 0.4 %. This low moisture absorption is well below the values of iglidur® G.

Diameter****d1 [mm]

shaft h9**[mm]**

iglidur® P****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

> 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® P bearings are standard bearings for shafts with tolerance (recommended minimum h9) and are designed to be pressed into aH7-toleranced mounting. After installation in a mounting with nominal dimensions, the inner diameter of the bearing with E10 tolerance adjusts itself. For certain dimensions, the tolerance deviates depending on the wall thickness (see product range).