iglidur® H4 - material data

Maximum surface speed

m/s

Rotating

Oscillating

Linear

permanent

1

0.7

1

Short-term

1.5

1.1

2

Table 02: Maximum surface speed

Permissible surface speeds
In contrast to the iglidur® H2 plain bearings, which are also cost-effective, iglidur® H4 has a considerably better coefficient of friction. This accounts for the higher permitted surface speeds that can be achieved with these bearings. Speeds of up to
1m/s are possible in continuous dry operation. The speeds shown in Table 02 are limit values for the lowest bearing loads. With higher loads, the permitted speed drops with the extent of the load due to the limitations set by the pv value.

iglidur® H4

Application temperature

Minimum

-40°C

Maximum, long-term

+200°C

Maximum, short-term

+240°C

In addition secure axially from

+110°C

Table 03: Temperature limits for iglidur® H4

Temperatures
iglidur® H4 is a temperature-resistant material. Therefore, iglidur® H4 plain bearings can be used in applications in which the bearings undergo a drying process without further load, for example. When temperatures rise, however, the compressive strength of iglidur® H4 plain bearings decreases. The additional frictional heat in the bearing system must be taken into account. At temperatures of over +110°C, additional securing is required.

Medium

Resistance

Alcohols

Hydrocarbons

Greases, oils without additives

Fuels

Diluted acids

+ up to 0

Strong acids

+ to -

Diluted alkalines

Strong alkalines

+ resistant      0 partially resistant      - non-resistant
All information applies to room temperature [+20 °C]
Table 05: Chemical resistance of iglidur® H4

Chemical resistance
iglidur® H4 plain bearings offer good resistance to chemicals. They withstand most lubricants.
iglidur® H4 is also not affected by most weak organic and inorganic acids.

**
Electrical specifications**

Specific transitional resistance

> 1013Ωcm

Surface resistance

> 1012 Ω

Radioactive radiation
iglidur® H4 withstands neutron and gamma particle radiation without detectable losses of its excellent mechanical properties.
Plain bearings made from iglidur® H4 are resistant to a radiation intensity of up to 2 · 102 Gy.

Max. Moisture absorption

at +23°C/50% r. humidity

0.1 weight %

Max. moisture absorption

0.2% weight

Table 06: Moisture absorption of iglidur® H4

The moisture absorption of iglidur® H4 plain bearings in normal climatic conditions is less than 0.1%. The saturation limit in water is 0.2%. iglidur® H4 is therefore ideal for wet environments.

Diameter
d1 [mm]

Shaft h9
[mm]

iglidur® H4
F10[mm]

Housing H7
[mm]

up to 3

0 - 0.025

+0.006 +0.046

0 +0.010

> 3 up to 6

0 - 0.030

+0.010 +0.058

0 +0.012

> 6 up to 10

0 - 0.036

+0.013 +0.071

0 +0.015

> 10 up to 18

0 - 0.043

+0.016 +0.086

0 +0.018

> 18 up to 30

0 - 0.052

+0.020 +0.104

0 +0.021

> 30 up 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 for iglidur® H4 plain bearings according to ISO 3547-1 after press-fit

Installation tolerances
iglidur® H4 plain bearings are standard bearings for shafts with h-tolerance (minimum h9 recommended).

The bearings are designed for press-fit into a housing machined to a tolerance of h7. After being assembled into a nominal-size housing, the inner diameter automatically adjusts to the F10 tolerances. For particular dimensions the tolerance differs depending on the wall thickness (please see product range).