iglidur® H2 - Material data

Material table

General specification

Unit

iglidur® H2

Test method

density

g/cm³

1,72

Colour

brown

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

% by weight

0,1

DIN 53495

max. total moisture absorption

wt.-%

0,2

Sliding friction coefficient, dynamic, against steel

0,07 - 0,3

pv value, max. (dry)

MPa x m/s

0,58

Mechanical specification

flexural modulus

MPa

10.300

DIN 53457

flexural strength at 20°C

MPa

210

DIN 53452

Compressive strength

MPa

109

maximum recommended surface pressure (20°C)

MPa

110

Shore D hardness

DIN 53505

Physical and thermal specification

Upper long-term application temperature

°C

+200

Upper short-term application temperature

°C

+240

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

> 1015

DIN IEC 93

surface resistance

> 1014

DIN 53482

Table 01: Material data

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When using iglidur® H2 plain bearings, economic aspects take centre stage. For the first time, it is possible to offer a high-performance plain bearing for high volumes with these technical advantages at such a favourable price: Temperatures up to 200°C, permissible surface pressure up to 110 N/mm, very good chemical resistance. iglidur® H2 plain bearings are self-lubricating and suitable for all movements.

Mechanical specification
The maximum recommended surface pressure is a mechanical material parameter. Conclusions on the tribology cannot be drawn from it. The compressive strength ofiglidur® H2 bearings decreases with increasing temperatures. diagram. 02 illustrates this correlation.

diagram. 03 shows the elastic deformation of iglidur® H2 under radial load. Under the maximum recommended surface pressure of 110 MPa, the deformation at room temperature is less than 3 %. The values for flexural and compressive strength at room temperature are higher than those of iglidur® H.

m/s

rotating

oscillating

linear

continuous

0,9

0,6

2,5

short-term

0,7

Table 02: Maximum surface speed

Permissible sliding speeds
The development of iglidur® H2 focussed on cost aspects and mechanical strength, and the permissible sliding speeds of these bearings are rather low, which primarily allows them to be used for slow movements or in intermittent operation.

iglidur® H2

Application temperature

below

- 40 °C

upper, long-term

+ 200 °C

upper, short-term

+ 240 °C

additional axial protection from

+ 110 °C

Table 03: Temperature limits for iglidur® H2

Temperatures
iglidur® H2 is an extremely temperature-resistant material.The short-term permissible maximum temperature is +240 °C and thus permits the use of iglidur® H2 bearings in applications in which the bearings are subjected to a paint drying process, for example, without further load.With increasing temperatures, however, the compressive strength of iglidur® H2 bearings decreases more than with iglidur® H.The temperatures prevailing in the bearing system also have an influence on the bearing wear. The wear increases with rising temperatures. Additional protection is required at temperatures higher than+110 °C.

Friction and wear
Diagrams 04 to 06 illustrate how the coefficient of friction of iglidur® H2 plain bearings changes with different sliding speeds, loads and roughnesses.

iglidur® H2

dry

Grease

oil

water

coefficient of friction µ

0,07 - 0,30

0,09

0,04

Table 04: coefficient of friction for iglidur® H2 against steel (Ra = 1 μm, 50 HRC)

diagram. 06: Wear, rotating application with different

Shaft materials
When it comes to the wear resistance of combinations with iglidur® H2, it must be pointed out once again that these bearings were developed for high mechanical strength. However, the wear resistance of no bearing/shaft combination reaches the values of iglidur® H370 with the corresponding shaft.

If iglidur® H2-bearing are used, they should not be combined with hard chrome-plated shafts. Shafts made ofCf53 and 304 SS are much better suited, as can be seen in Figs. 06 and 07.

Shaft materials

diagram. 07: Wear with swivelling and rotating

Medium

Resistance

Alcohols

hydrocarbons

Greases, oils, not additivated

fuels

Diluted acids

+ to 0

strong acids

+ to -

Dilute bases

strong bases

+ resistant 0 conditionally resistant - not resistant
All data at room temperature [+20 °C]
Table 05: chemical resistance of iglidur® H2

Chemical resistance
iglidur® H2 plain bearings have good resistance to chemicals. They are resistant to most lubricants. iglidur® H2 is not attacked by most weak organic and inorganic acids.

**
Electrical specification

Volume resistivity

> 1015 Ωcm

surface resistance

> 1014 Ω

Radioactive radiation
iglidur® H2 withstands both neutron and gamma particle radiation without any noticeable loss of its excellent mechanical specification. Bearings made from iglidur® H2 are radiation-resistant up to a radiation intensity of 2 x 10² Gy.

Maximum moisture absorption

at +23 °C/50 % room humidity.

0.1 % by weight

max. total moisture absorption

0.2 % by weight

Moisture absorption
The moisture absorption of iglidur® H2 bearings is less than 0.1 % in a normal climate. The saturation limit in water is 0.2 %. iglidur® H2 is therefore the ideal material for wet environments.

Diameter****d1 [mm]

shaft h9**[mm]**

iglidur® H2****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

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

Installation tolerances
iglidur® H2 bearings are standard bearings for shafts with tolerance (recommended at least h9).

The bearings are designed for press-fitting into anH7-toleranced mount. After installation in a mounting with nominal dimension, the inner diameter of the bearing with F10 tolerance adjusts itself automatically.