iglidur® H1 - Material data

Material data table

General properties	Unit	iglidur® H1	Testing method
Density	g/cm³	1.53
Colour		cream
Max. moisture absorption at +23°C/50% room humidity	% weight	0.1	DIN 53495
Max. moisture absorption	% weight	0.3
Coefficient of sliding friction, dynamic against steel	µ	0,06 - 0,20
pv value, max. (dry)	MPa x m/s	0.8
Mechanical properties
Flexural modulus	MPa	2800	DIN 53457
Flexural strength at 20°C	MPa	55	DIN 53452
Compressive strength	MPa	78
Maximum recommended surface pressure (20°C)	MPa	80
Shore D hardness		77	DIN 53505
[b]Physical and thermal properties [/b]
Max. long-term application temperature	°C	+200
Max. short-term application temperature	°C	+240
min. 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	6	DIN 53752
Electrical properties
Specific transitional resistance	Ωcm	> 10¹²	DIN IEC 93
Surface resistance	Ω	> 10¹¹	DIN 53482

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diagram. 01: Permissible pv value for iglidur® H1 plain bearings

iglidur® H1 plain bearings have been specially developed for use under extreme environmental conditions. Their strengths are their extremely high wear resistance and excellent friction values, even in applications in which the bearing is exposed to high temperatures or aggressive media. iglidur® H1 plain bearings can be used completely lubrication-free; when used in wet areas, the surrounding medium can act as an additional lubricant.

diagram. 02: maximum recommended surface pressure as a function of temperature (80 MPa at +20 °C)

Mechanical specification

The maximum recommended surface pressure is a mechanical material parameter. No conclusions can be drawn about the tribology. The compressive strength of iglidur® H1 plain bearings decreases with increasing temperatures. diagram. 02 illustrates this relationship.

diagram. 03 shows the elastic deformation of iglidur® H1 under radial load. Among the iglidur® H materials, iglidur® H1 is the material with the greatest flexibility. This must be taken into account for applications with high surface pressures or edge loads.

Diagram 03: Deformation under pressure and temperature

Permissible sliding speeds

Due to the excellent coefficient of friction, sliding speeds of up to 2 m/s are possible with iglidur® H1 plain bearings in dry operation. Linear speeds of up to 5 m/s can be realised. The speeds given in Table 02 are limit values for the lowest bearing loads. At higher loads, the permissible speed decreases with the load due to the limitations of the pv value.

Maximum surface speed

m/s	Rotating	Oscillating	linear
permanent	2	1.0	5
Short-term	2.5	1.5	7

Surface Speedp x v value and lubrication

Temperatures

iglidur® H1 is a very temperature-resistant material. The temperatures prevailing in the bearing system also have an influence on the bearing wear. The wear increases with rising temperatures. Especially with iglidur® H1, however, this increase is very low. Additional protection is required at temperatures higher than +80 °C.

iglidur® H1	Application temperature
Minimum	-40°C
Max. long-term	+200°C
Maximum, short-term	+240°C
In addition secure axially from	+80°C

Temperatures, coefficient of thermal expansion

Diagram 04: Coefficient of friction as a function of the surface speed, p = 0.75MPa

Friction and wear

The coefficient of friction as well as the wear resistance changes with increasing load and surface speed (diagram. 04 and 05).

coefficient of friction for iglidur® H1 against steel (Ra = 1 µm, 50 HRC):

iglidur® H1	dry	Greases	Oil	Water
Coefficients of friction µ	0,06 - 0,2	0.09	0.04	0.04

Diagram 05: Coefficient of friction as a function of the pressure, v = 0.01m/s

Further information:

Coefficient of frictionWear resistance

diagram. 06: Wear, rotating application with different

Shaft materials

diagrams 06 and 07 show an extension of the results of tests with different shaft materials, which were carried out with plain bearings made of iglidur® H1 in the igus® laboratory.

Bearings made of iglidur® H1 show excellent wear behaviour in combination with a wide variety of shaft materials in both rotation and swivel operation. On 304 SS shafts in particular, iglidur® H1 achieves very low wear rates in both rotation and swivelling operation. Even on hard-coated aluminium shafts, iglidur® H1 plain bearings have a long service life in rotating applications with low to medium loads.

Shaft materials

diagram. 07 Wear in oscillating and rotating machines

Chemical resistance

iglidur® H1 plain bearings have good resistance to chemicals. Therefore, even chemicals can act as a lubricant. iglidur® H1 plain bearings are not resistant to hot, oxidising acids and some other particularly aggressive chemicals.

+ resistant 0 conditionally resistant - not resistant
All data at room temperature [20 °C]

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

Chemical resistance

Radioactive radiation

Resistant up to a radiation intensity of 2 x102 Gy.

UV resistance

iglidur® H1 bearings are only partially resistant to UV radiation. Under the influence of the weather, the surface of iglidur® H1 becomes rougher and wear increases. Therefore, the use of iglidur® H1 plain bearings that are directly exposed to the weather must be checked on a case-by-case basis.

Vacuum

When used in a vacuum, it must be taken into account that the water components - even if only small - outgas. Use in a vacuum is generally possible.

Electrical specification

iglidur® H1 plain bearings are electrically insulating.

Electrical properties
Specific transitional resistance	> 10¹² Ωcm
Surface resistance	> 10¹¹ Ω

Moisture absorption

The moisture absorption of iglidur® H1 bearings is approx. 0.1% by weight in a normal climate. The saturation limit in water is 0.3% by weight. Therefore, iglidur® H1 is very well suited for use in wet environments.

Maximum moisture absorption
at +23 °C/50 % r. humidity	0.1 weight %
Max. moisture absorption	0.3% weight

Installation tolerances

iglidur® H1 plain bearings are press-fit bushings for shafts with h-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 automatically. For certain dimensions, the tolerance deviates depending on the wall thickness (see product range).

Diameter d1 [mm]	Shaft h9 [mm]	iglidur® H1 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