|General features||Unit||iglidur® GLW||test method|
|Max. humidity absorption at 23°C/50% R. H.||% weight||1,3||DIN 53495|
|Max. water absorption||% weight||5,5|
|Coefficient of surface friction, dynamic, against steel||µ||0,1 - 0,24|
|PV values max. (dry)||MPa x m/s||0,3|
|Bending E-module||MPa||7.700||DIN 53457|
|Tensile strength at +20 °C||MPa||235||DIN 53452|
|Maximum recommended surface pressure (20° C)||MPa||80|
|Shore D hardness||78||DIN 53505|
Physical and thermal properties
|Max. long term application temperature||°C||+100|
|Max. short term application temperature||°C||+160|
|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]||17||DIN 53752|
|Specific forward resistance||Ωcm||> 1011||DIN IEC 93|
|Surface resistance||Ω||> 1011||DIN 53482|
We can offer our customers bearings made of the material iglidur® GLW as an alternative to iglidur® G for high volume applications. Possessing similar characteristic values as iglidur® G bearings, the iglidur® GLW bearings are especially recommendable for static loads in particular. For these applications, where the dynamic properties of iglidur® G can be largely dispensed with, they represent an extremely cost-efficient alternative.
Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it.
With increasing temperatures, the compressive strength of iglidur® GLW plain bearings decreases. Fig. 02 clarifies this connection.
Fig. 03 shows the elastic deformation of iglidur® GLW during radial loading. Under the maximum recommended surface pressure of 70 MPa and at room temperature, the deformation amounts to less than 3%. Under this load a plastic deformation can be negligible. However this also depends on the period of action.
iglidur® GLW has been developed for low to medium surface speeds. In continuous operation, maximum speeds up to 0.8 m/s (rotating) and 2.5 m/s (linear) respectively are permitted. Here too, the maximum values stated in Table 02 are attained only with the minimum pressure loads and are seldom achieved in practice, as the temperature rises above the permitted maximum value.
|iglidur® GLW||Operating temperature|
|Lower||- 40 °C|
|Upper, long-term||+ 100 °C|
|Upper, short-term||+ 160 °C|
|Secure axially in addition||+ 80 °C|
|Coefficients of friction µ||0,10 - 0,24||0,09||0,04||0,04|
Friction and wear depend to a high degree on the reverse partner. Very smooth shafts increase the coefficient of both friction and wear. The best suited are smoothed surfaces with an average surface finish Ra between 0.1 and 0.2 µm. (Fig. 06) The Fig. 06 displays a summary of the results of tests with different shaft materials conducted with bearings made of iglidur® GLW. Please contact us in case the shaft material scheduled by you is not included in this list.
|Alcohols||+ to 0|
|Fats, oils, without additives||+|
|Diluted acids||0 to -|
|Specific forward resistance||> 1011 Ωcm|
|Surface resistance||> 1011 Ω|
iglidur® GLW bearings have a good resistance against chemicals. They are resistant to most lubricants. The iglidur® GLW is not affected by most weak organic and inorganic acids.
iglidur® GLW bearings are radiation resistant up to a radioactive intensity of 3 x 10² Gy.
iglidur® GLW bearings are permanently resistant against UV rays.
In vacuum, iglidur® GLW degases. The application in vacuum should be checked earlier.
iglidur® GLW bearings are electrically insulating.
|Maximum moisture absorption|
|by +23 °C/50 % r. F.||1,3 Wt.-%|
|Max. water absorption||5,5 Wt.-%|
The humidity absorption of iglidur® GLW bearings amounts to about 1,3% in standard climatic conditions. The saturation limit in water is 5,5 %. This should be considered according to application conditions.
|Up to 3||0 - 0,025||+0,014 +0,054||0 +0,010|
|> 3 to 6||0 - 0,030||+0,020 +0,068||0 +0,012|
|> 6 to 10||0 - 0,036||+0,025 +0,083||0 +0,015|
|> 10 to 18||0 - 0,043||+0,032 +0,102||0 +0,018|
|> 18 to 30||0 - 0,052||+0,040 +0,124||0 +0,021|
|> 30 to 50||0 - 0,062||+0,050 +0,150||0 +0,025|
|> 50 to 80||0 - 0,074||+0,060 +0,180||0 +0,030|
|> 80 to 120||0 - 0,087||+0,072 +0,212||0 +0,035|
|> 120 to 180||0 - 0,100||+0,085 +0,245||0 +0,040|
iglidur® GLW- 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 E10 tolerance. In certain dimensions the tolerance in dependence on the wall thickness deviates from this (See delivery program )
The iglidur® GLW bearings are manufactured according to order specifications. Please contact us for applications with large numbers of bearings made of iglidur® GLW as alternative to iglidur® G.