iglidur® Z - Material data

Material table

General specification

Unit

iglidur® Z

Test method

density

g/cm³

1,40

Colour

brown

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

% by weight

0,3

DIN 53495

max. total moisture absorption

wt.-%

1,1

Sliding friction coefficient, dynamic, against steel

0,06 - 0,14

pv value, max. (dry)

MPa x m/s

0,84

Mechanical specification

flexural modulus

MPa

2.400

DIN 53457

flexural strength at 20°C

MPa

DIN 53452

Compressive strength

MPa

maximum recommended surface pressure (20°C)

MPa

150

Shore D hardness

DIN 53505

Physical and thermal specification

Upper long-term application temperature

°C

+250

Upper short-term application temperature

°C

+310

Lower application temperature

°C

-100

thermal conductivity

[W/m x K]

0,62

ASTM C 177

coefficient of thermal expansion (at 23°C)

[K-1 x 10-5]

DIN 53752

Electrical specification

Volume resistivity

Ωcm

> 1011

DIN IEC 93

surface resistance

> 1011

DIN 53482

Table 01: Material data

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Along with iglidur® X, iglidur® Z is one of the iglidur® high-temperature materials with the widest distribution. Especially the excellent wear behaviour under external conditions (high loads and temperatures) should be emphasised.

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

diagram. 03 shows the elastic deformation of iglidur® Z under radial load. At 150 MPa, the deformation is approx. 5.5 %.

m/s

rotating

oscillating

linear

continuous

1,5

1,1

short-term

3,5

2,5

Table 02: Maximum surface speed

Permissible sliding speeds
iglidur® Z is a high-temperature material that is suitable for applications with very high specific loads. The maximum values specified in Table 03 can only be achieved at low pressure loads; at the specified speeds, friction can lead to an increase up to the limit of the permanently permissible temperature. In practice, these limit values cannot always be achieved due to the interaction of different fluids.

iglidur® Z

Application temperature

lower

- 100 °C

upper, long-term

+ 250 °C

upper, short-term

+ 310 °C

additional axial protection from

+145° C

Table 03: Temperature limits for iglidur® Z

Temperatures
The maximum permissible short-term temperature is +310 °C. The temperatures prevailing in the bearing system also have an influence on bearing wear. Wear increases with rising temperatures. At high temperatures, iglidur® Z is also the most wear-resistant material in dry operation. Additional protection is required at temperatures higher than +145 °C.

diagram. 04: coefficient of friction as a function of the surface speed

Friction and wear
The coefficient of friction decreases, as does the wear resistance of the load to be carried (diagrams 04 and 05).

diagram. 05: coefficient of friction as a function of the load

iglidur® Z

Dry

Grease

oil

water

coefficient of friction µ

0,06 - 0,14

0,09

0,04

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

Shaft materials
Diagram 06 shows wear rates in the lower load range that are very similar to those of other very wear-resistant iglidur®materials. In the upper range, however, iglidur® Z outperforms all other materials in terms of wear resistance. With a Cf53 shaft, for example, the wear at 45 MPa is only 15 μm/km.
At low loads, iglidur® Z bearings wear less in swivelling operation than in rotation. V2A shafts and hard chrome-plated shafts are particularly noticeable here.

Shaft materials

diagram. 07: Wear with oscillating and rotating

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® Z

Chemical resistance
iglidur® Z bearings have very good resistance to chemicals. They have excellent resistance to organic solvents, fuels, oils and greases. The material is only partially resistant to weak acids.

**
Electrical specification

Volume resistivity

> 1011 Ωcm

surface resistance

> 1011 Ω

Radioactive radiation
Bearings made of iglidur® Z are resistant to radiation up to a radiation intensity of 1 x 105 Gy.

Maximum moisture absorption

at +23 °C/50 % room humidity.

0.3 % by weight

max. total moisture absorption

1.1 % by weight

Table 06: Moisture absorption

Moisture absorption
The moisture absorption of iglidur® Z bearings is about 0.3 % in a normal climate. The saturation limit in water is 1.1 %.

Diameter****d1 [mm]

shaft h9**[mm]**

iglidur® Z****F10 [mm]

housing H7**[mm]**

to 3

0 - 0,025

+0,006 +0,046

0 +0,010

> 3 to 6

0 - 0,030

+0,010 +0,058

0 +0,012

> 6 to 10

0 - 0,036

+0,013 +0,071

0 +0,015

> 10 to 18

0 - 0,043

+0,016 +0,086

0 +0,018

> 18 to 30

0 - 0,052

+0,020 +0,104

0 +0,021

> 30 to 50

0 - 0,062

+0,025 +0,125

0 +0,025

> 50 to 80

0 - 0,074

+0,030 +0,150

0 +0,030

> 80 to 120

0 - 0,087

+0,036 +0,176

0 +0,035

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

Installation tolerances
iglidur® Z bearings are standard bearings for shafts with 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 F10 tolerance adjusts itself. For certain dimensions, the tolerance deviates depending on the wall thickness (see product range).