|General features||Unit||iglidur® H2||test method|
|Max. humidity absorption at 23°C/50% R. H.||% weight||0,1||DIN 53495|
|Max. water absorption||% weight||0,2|
|Coefficient of surface friction, dynamic, against steel||µ||0,07 - 0,3|
|PV values max. (dry)||MPa x m/s||0,58|
|Bending E-module||MPa||10.300||DIN 53457|
|Tensile strength at +20 °C||MPa||210||DIN 53452|
|Maximum recommended surface pressure (20° C)||MPa||110|
|Shore D hardness||88||DIN 53505|
Physical and thermal properties
|Max. long term application temperature||°C||+200|
|Max. short term application temperature||°C||+240|
|Lower application temperature||°C||-40|
|Heat conductivity||[W/m x K]||0,24||ASTM C 177|
|Coefficient of thermal expansion (at 23° C)||[K-1 x 10-5]||4||DIN 53752|
|Specific forward resistance||Ωcm||> 1015||DIN IEC 93|
|Surface resistance||Ω||> 1014||DIN 53482|
In applications with the iglidur® H2 bearings, economical aspects are in focus. It is the first time that it is possible to offer such a high-performance bearing for large volume applications with these technical advantages at such a low price: Temperatures till 200° C, permitted surface pressure till 110 N/mm, and excellent chemical resistance. iglidur® H2 bearings are self-lubricating and suitable for all motions.
Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it. With increasing temperatures, the compressive strength of iglidur® H2 bearings decreases. Fig. 02 clarifies this connection.
Figure 03 shows the elastic deformation of iglidur® H2 with radial loads. Under the maximum recommended surface pressure of 110 MPa, the deformation at room temperature amounts to less than 3 %. The values for bending and compressive strengths lie above those of iglidur® H at room temperature.
|iglidur® H2||Operating temperature|
|Lower||- 40 °C|
|Upper, long-term||+ 200 °C|
|Upper, short-term||+ 240 °C|
|Secure axially in addition||+ 110 °C|
iglidur® H2 is an extremely temperature-resistant material. The short-term permitted maximum temperature is +240°C, and this enables the iglidur® H2 plain bearings to be used, for instance, in a paint drying process without further load. With increasing temperatures, however, the compressive strength of iglidur® H2 plain bearings decreases more strongly than in iglidur® H. The temperatures prevailing in the bearing system also have an influence on the bearing wear. The wear rises with increasing temperatures. An additional securing is recommended at temperatures higher than +110°C.
The figures 04 to 06 clarify how the coefficients of friction of iglidur® H2 bearings alter with different surface speeds, loads and surface finishes.
|Coefficients of friction µ||0,07 - 0,30||0,09||0,04||0,04|
Regarding the wear resistance of combinations with iglidur® H2, it must be pointed out once again that this bearing was developed for high mechanical stability. The wear resistance however does not attain, with none of the bearing-shaft combinations, the values of iglidur® H370 with the corresponding shaft.
When the iglidur® H2 bearings are used, they should not be combined with hard-chromed shafts. Shafts made of CF53 and V2A are essentially better, as is found in Figures 06 and 07.
|Greases, oils without additives||+|
|Diluted acids||+ to 0|
|Strong acids||+ to -|
|Specific forward resistance||> 1015 Ωcm|
|Surface resistance||> 1014 Ω|
iglidur® H2 bearings have a good resistance against chemicals. They are resistant to most lubricants. The iglidur® H2 is not affected by most weak organic and inorganic acids.
iglidur® H2 withstands both the neutron and gamma particle radiations without noticeable loss to its excellent mechanical properties. iglidur® H2 bearings are radiation resistant up to a radioactive intensity of 2 x 10² Gy.
iglidur® H2 bearings alter under the influence of UV rays and other climatic influences. The surface becomes coarser, and the compressive strength declines. Therefore the use of iglidur® H2 in applications directly exposed to climatic conditions should be tested.
The low water elements degas in the vacuum. The use in vacuum is possible.
iglidur® H2 bearings are electrically insulating.
|Maximum moisture absorption||by +23 °C/50 % r. F.||0,1 weight-%||Max. water absorption||0,2 weight-%|
The humidity absorption of iglidur® H2 bearings is about 0,1% in standard climatic conditions. The saturation limit in water is 0,2 %. iglidur® H2 is therefore the ideal material for wet areas.
|Up 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|
iglidur® H2 bearings are standard bearings for shafts with h-tolerance (recommended minimum h9).
The bearings are designed for press-fit in a housing with h7 tolerance. After the installation in a housing with nominal diameter, the inner diameter of the bearing automatically adjusts to the F10 tolerance.
The iglidur® H2 bearings are manufactured according to order specifications. Please contact us for applications with large numbers of bearings made of iglidur® H2 as alternative to iglidur® H and H370.