|General features||Unit||iglidur® N54||test method|
|Max. humidity absorption at 23°C/50% R. H.||% weight||1,6||DIN 53495|
|Max. water absorption||% weight||3,6|
|Coefficient of surface friction, dynamic, against steel||μ||0,15–0,23|
|PV values max. (dry)||MPa x m/s||0,5|
|Bending E-module||MPa||1.800||DIN 53457|
|Tensile strength at +20 °C||MPa||70||DIN 53452|
|Maximum recommended surface pressure (20° C)||MPa||36|
|Shore D hardness||74||DIN 53505|
Physical and thermal properties
|Max. long term application temperature||°C||+80|
|Max. short term application temperature||°C||+120|
|Upper short-term ambient temperature1)||°C||+140|
|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||9||DIN 53752|
|Specific forward resistance||Ωcm||< 1013||DIN IEC 93|
|Surface resistance||Ω||< 1011||DIN 53482|
iglidur® N54 is the first iglidur® material based largely in biopolymers. In addition to the already assured lubricant-free properties of iglidur® materials, this is one further contribution to positive environmental stewardship. The good coefficients of friction in conjunction with holding times ensure that these materials have a permanent place in the iglidur® product range.
Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it. The compressive strength of iglidur® N54 bearings decreases with increasing temperatures. Fig. 02 clarifies this relationship. At the long-term permitted application temperature of 120°C, the permitted surface pressure still amounts to 10 MPa.
Figure 03 shows the elastic deformation of iglidur® N54 at radial loads.
Even if the typical applications for iglidur® N54 plain bearings are more commonly for intermittent service, depending on the type of motion, the maximum attainable speeds can be quite high. The speeds stated in Table 02 are limit values for the lowest bearing loads. As loads increase, the admissible speed is reduced with higher loads due to the limitations of the pv value.
|iglidur® N54||Application temperature|
|Lower||- 40 °C|
|Upper, long-term||+ 80 °C|
|Upper, short-term||+ 120 °C|
|Secure axially in addition||+ 60 °C|
The short-term admissible temperature limit is +140 °C, thus permitting the use of iglidur® N54 plain bearings in all applications with elevated ambient temperatures. However, the compressive strength of iglidur® N54 bearings decreases as temperatures increase. The additional frictional heat in the bearing system should be taken into account when considering the temperature limits. An additional securing is recommended at temperatures higher than +60°C.
iglidur® N54 has a low coefficient of friction. However it must be noted that a gliding partner with a rough surface finish increases the friction. We recommend shaft surface finishes (Ra) of 0.1 to a maximum of 0.4 µm.
The coefficient of friction of iglidur® N54 bearings is only marginally dependent on the surface speed.
The influence of the load is greater; an increase in load lowers the coefficient of friction up to 0.8.
|Coefficients of friction µ||0,15 - 0,23||0,09||0,04||0,04|
|Alcohols||+ to 0|
|Greases, oils without additives||+|
|Diluted acids||0 to +|
|Specific forward resistance||< 1013 Ωcm|
|Surface resistance||< 1011 Ω|
iglidur® N54 plain bearings have good resistance to chemicals. They are resistant to most lubricants. iglidur® N54 is not impaired by most weak organic and inorganic acids and bases.
iglidur® N54 plain bearings can be used with restrictions when exposed to radiation. They are resistant up to a radiation intensity of 1 x 104 Gy.
iglidur® N54 plain bearings are resistant to UV rays.
The low water elements degas in the vacuum. Applications under vacuum conditions are possible with restrictions.
iglidur® N54 plain bearings are electrically insulating.
|Maximum moisture absorption||by +23 °C/50 % r. F.||1,6 weight-%|
|Max. water absorption||3,6 weight-%|
The moisture absorption of iglidur® N54 bearings is about 1.6% in standard climatic conditions. The saturation limit in water is 3.6 %.
|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|
iglidur® UW 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 )