iglidur® Q290 - Material data

Material table

General specification

Unit

iglidur® Q290

Test method

density

g/cm³

1,27

Colour

black colour

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

% by weight

3,0

DIN 53495

max. total moisture absorption

wt.-%

9,3

Sliding friction coefficient, dynamic, against steel

0,14 - 0,26

pv value, max. (dry)

MPa x m/s

0,70

Mechanical specification

flexural modulus

MPa

3.074

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

+140

Upper short-term application temperature

°C

+180

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

> 1012

DIN IEC 93

surface resistance

> 1012

DIN 53482

Table 01: Material data

Download data sheet

iglidur® Q290 plain bearings do not stand for the highest static load carrying capacity within the iglidur® programme, but the strengths of this material become apparent with medium to high dynamic loads: With robust swivel applications, e.g. in agricultural or construction machinery, and then especially on "soft" shafts, excellent service lives are achieved - for shaft and bearing!

Mechanical specification
The compressive strength of iglidur® Q290 plain bearings decreases with increasing temperatures. diagram 02 illustrates this relationship. At the short-term permissible application temperature of +180 °C, the permissible surface pressure is still more than 10 MPa. The maximum recommended surface pressure represents a mechanical material parameter. Conclusions about the tribology cannot be drawn from this.

diagram. 03 shows the elastic deformation of iglidur® Q290 under radial load.

Maximum surface speed

m/s

rotating

oscillating

linear

continuous

0,8

0,6

short-term

2,0

1,4

2,0

Table 02: Maximum surface speed

Permissible sliding speeds
The typical applications for iglidur® Q290 bearings are medium to highly loaded swivelling movements with rather low speeds. Irrespective of this, very high maximum speeds can be achieved. The speeds specified in Table 02 are limit values for low bearing loads. They say nothing about the wear resistance at these parameters.

Temperatures
The upper long-term application temperature of +140 °C enables the use of iglidur® Q290, e.g. in typical applications in the agricultural, commercial vehicle or construction machinery sector. From an application temperature of +80 °C, an additional locating spigot of the bearing is required, as the press fit alone is then no longer sufficient.

Temperatures, coefficient of thermal expansion

Friction and wear
It must be noted that a sliding partner that is too rough increases friction. The coefficient of friction of iglidur® Q290 also increases with increasing speed (diagram.04). In contrast, the coefficient of friction decreases continuously with the radial load, as shown in diagram 05.

Shaft materials
In general, the use of hardened shafts is recommended for higher loads from around 10 MPa. However, this is often not the case in practice, especially in conjunction with corrosion-resistant coating processes. For this reason, the material iglidur® Q290 is particularly important in such applications. diagram. 08 shows this very clearly in conjunction with galvanised shafts.

Shaft materials

Medium

Resistance

Alcohols

+ to 0

Hydrocarbons

Greases, oils, not additivated

fuels

Diluted acids

0 to -

strong acids

+ to 0

Dilute bases

strong bases

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

Radioactive radiation
Bearings made of iglidur® Q290 are resistant to radiation up to a radiation intensity of 3 x 102 Gy.

Maximum moisture absorption

at +23 °C/50 % room humidity.

3.0 % by weight

max. total moisture absorption

9.3 % by weight

Table 06: Moisture absorption of iglidur® Q2

Moisture absorption
The moisture absorption of iglidur® Q290 bearings is 3.0% by weight in a normal climate. The saturation limit in water is 9.3% by weight.

Diameter****d1 [mm]

shaft h9**[mm]**

iglidur® Q290****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

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

Installation tolerances
iglidur® Q290 bearings are standard bearings for shafts with tolerance (recommended minimum h9).

The bearings are designed for press-fitting into a h7-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).