iglidur® H - Material data

The most important specifications at a glance

iglidur H is a fibre-reinforced thermoplastic material that was specially developed for applications in high humidity or under water. Plain bearings made from iglidur H can be used completely free of lubrication; in wet applications, the surrounding media acts as additional lubricant.

Descriptive technical specifications
Wear resistance at +23°C	- 🟧 🟧 ⬜️ ⬜️ ⬜️ +	More information on wear resistance
Wear resistance at +90°C	- 🟧 🟧 ⬜️ ⬜️ ⬜️ +
Wear resistance at +150°C	- 🟧 🟧 🟧 ⬜️ ⬜️ +
Slide property	- 🟧 🟧 🟧 ⬜️ ⬜️ +	Coefficient of friction, dynamic, against steel: µ 0.07 - 0.20
Wear resistance under water	- 🟧 🟧 🟧 🟧 ⬜️ +
Media resistance	- 🟧 🟧 🟧 🟧 🟧 +	More information on media resistance
Resistant to edge pressures	- 🟧 🟧 ⬜️ ⬜️ ⬜️ +
Resistant to shock and impact loads	- 🟧 🟧 ⬜️ ⬜️ ⬜️ +
Dirt resistance	- 🟧 🟧 🟧 ⬜️ ⬜️ +

When do I use this material?

For underwater applications
When high temperature resistance is required
For high mechanical loading
For applications in contact with chemicals

When do I use a different material?

When extremely high wear resistance under water is required -> iglidur H370
When the best universal chemical resistance is required -> iglidur X
For the maximum compressive strength at higher temperatures -> iglidur X, iglidur Z

Download data sheet

Temperatures

With increasing temperatures, the compressive strength of iglidur H plain bearings decreases. The temperatures prevailing in the bearing system also have an influence on the wear. Additional securing is required at temperatures higher than +120°C.

Temperatures, coefficient of thermal expansion

Min. application temperature	Upper application temperature, long-term	Upper application temperature, short-term	In addition secure axially from
-40°C	+200°C	+240°C	+120°C

Permissible surface speeds

The maximum permitted surface speed is dependent on whether the temperature at the bearing point becomes too high or not. iglidur H is suitable for maximum surface speeds of 1m/s (rotating) and 3m/s (linear) in dry operation. Linear movements enable higher surface speeds, as a large area of the shaft contributes to the cooling.

Surface speeds of various iglidur materials

Maximum surface speeds [m/s]	Rotating	Oscillating	Linear
Long-term	1.0	0.7	3.0
Short-term	1.5	1.1	4.0

Permissible pv values

Chart with logarithmic axes and a downward-sloping curve.

pv value, max. (dry)

MPa · m/s

1.37

Information on the pv value and lubrication

Mechanical properties

The maximum recommended surface pressure is a mechanical material parameter. No conclusions regarding the tribological properties can be drawn from this. With increasing temperatures, the compressive strength of iglidur H plain bearings decreases. Diagram 02 shows this inverse relationship. Diagram 03 shows the elastic deformation of iglidur H at radial loads. At the maximum recommended surface pressure of 90MPa the deformation is about 2.5%.

Graph with a declining line from about 90 at X=20 to about 25 at X=200.

Chart with two rising lines: +60 °C is above +23 °C.

Friction and wear

The coefficient of friction changes with increasing load, as does the wear resistance.
Interestingly, the coefficient of friction µ lowers slightly with the increase of surface speed at constant load (see diagram 04 and 05).

Coefficient of friction against steel (Ra = 1µm, 50HRC):

iglidur H	dry	Greases	Oil	Water
Coefficient of friction μ	0.07-0.20	0.09	0.04	0.04

Chart with a slightly descending curve on the X and Y axes.

Chart with a descending curve that flattens as the X value increases.

Shaft materials

Diagram 06 and 07 display the results of tests with different shaft materials executed with plain bearings made of iglidur H. The iglidur H plain bearings give different results when used in rotating and pivoting applications on different shaft materials. The Cf53 and HR carbon steel shafts give the best wear values in rotating applications, whereas the 304 stainless steel shafts (which are not so good for rotation) give the best results in pivoting applications. Hard-chromed shafts only give an advantage at low pressures when used with iglidur H bearings.

Further information on shaft materials

Bar chart with values A to G, with the tallest bars at D and C.

Bar chart with four categories from A to D and two data series in blue and magenta.

Chemical resistance

iglidur H plain bearings have good resistance to chemicals. Therefore, even aggressive chemicals can act as a lubricant. iglidur H plain bearings are non-resistant to hot, oxidising acids.

All data at room temperature [+20 °C], + resistant 0 conditionally resistant - non-resistant

Chemicals	Resistance
Alcohols	+
Greases, oils without additives	+
Hydrocarbons	+
Fuels	+
Strong alkalines	+
Strong acids	+ to -
Diluted alkalines	+
Diluted acids	+ up to 0

Moisture absorption

The curve rises in a graph from lower left to upper right.

The moisture absorption of iglidur H plain bearings in normal climatic conditions is less than 0.1%. The saturation limit in water is 0.3%. iglidur H does not swell and is therefore very suitable for use in wet environments.

Maximum moisture absorption

at +23°C/50% r. humidity

0.1 weight %

Maximum water absorption

0.3% weight

Installation tolerances

iglidur H plain bearings are standard bearings for shafts with h-tolerance (recommended minimum h9). The bearings are designed for press-fit into a housing machined to a H7 tolerance. After being assembled into a nominal size housing, in standard cases the inner diameter automatically adjusts to the F10 tolerances. For particular dimensions the tolerance differs depending on the wall thickness (please see product range table).

Important tolerances according to ISO 3547-1 after press-fit:

Diameter d1 [mm]	Housing H7 [mm]	iglidur H plain bearing F10 [mm]	Shaft h9 [mm]
up to 3	+0.000 +0.010	+0.006 +0.046	-0.025 +0.000
> 3 up to 6	+0.000 +0.012	+0.010 +0.058	-0.030 +0.000
> 6 up to 10	+0.000 +0.015	+0.013 +0.071	-0.036 +0.000
> 10 up to 18	+0.000 +0.018	+0.016 +0.086	-0.043 +0.000
> 18 up to 30	+0.000 +0.021	+0.020 +0.104	-0.052 +0.000
> 30 up to 50	+0.000 +0.025	+0.025 +0.125	-0.062 +0.000
>50 to 80	+0.000 +0.030	+0.030 +0.150	-0.074 +0.000
>80 to 120	+0.000 +0.035	+0.036 +0.176	-0.087 +0.000
> 120 up to 180	+0.000 +0.040	+0.043 +0.203	+0.000 +0.100

Thermal conductivity

[W/m · K] 0.60

ASTM C 177

Coefficient of thermal expansion

(at +23°C) [K-1 · 10-5] 4

DIN 53752

Compressive strength

81MPa

Vacuum

In vacuum, any present moisture is released as vapour. The use in vacuum is generally possible.

Radiation resistance

iglidur H withstands both neutron and gamma particle radiation. Plain bearings made from iglidur H are resistant up to a radiation intensity of 2 · 102Gy.