|General specifications||Unit||iglidur® L350||Testing method|
|Max. moisture absorption at 23 °C/50% r.h.||% weight||0,4||DIN 53495|
|Max. total moisture absorption||% weight||1,4|
|Coefficient of sliding friction, dynamic, against steel||µ||0,07 – 0,18|
|pv value, max. (dry)||MPa x m/s||3,00|
|Flexural modulus||MPa||15.882||DIN 53457|
|Flexural strength at +20°C||MPa||210||DIN 53452|
|Recommended max. surface pressure (20°C)||MPa||59|
|Shore-D hardness||80||DIN 53505|
Physical and thermal properties
|Max. long-term application temperature||°C||+180|
|Max. short-term application temperature||°C||+210|
|Min. application temperature||°C||-100|
|Thermal conductivity||[W/m x K]||0,61||ASTM C 177|
|Coefficient of thermal expansion (at 23 °C)||[K-1 x 10-5]||7||DIN 53752|
|Specific volume resistance||Ωcm||> 105||DIN IEC 93|
|Surface resistance||Ω||> 105||DIN 53482|
With iglidur L350, another lubrication and maintenance-free material is now available, which is designed for continuous high speeds. Due to the low thermal expansion and low moisture absorption, bearings can be manufactured with minimal potential to expand. iglidur® L350 is especially suitable for use in fans, blowers or electric motors – and the costs are also lower.
Diagram 01: Permissible pv values for iglidur® L350 plain bearings with a wall thickness of 1 mm in dry operation against a steel shaft, at +20°C, mounted in a steel housing
X = Surface speed [m/s], Y = Load [MPa]
|Hydrocarbons||+ up to 0|
|Greases, oils without additives||+|
|Specific volume resistance||> 105 Ωcm|
|Surface resistance||> 105 Ω|
The very low moisture absorption of 0.4 %weight in standard climatic conditions and 1.4 %weight at maximum water absorption also enables continuous operation in high humidity or in liquid media.
In vacuum, the moisture content is released as vapour. Due to its low moisture absorption, use in a vacuum is possible.
Plain bearings made from iglidur® L350 are resistant up to a radiation intensity of 2 x 10² Gy. Higher radiation affects the material and may result in a significant decrease in mechanical properties.
The material properties of iglidur® L350 plain bearings do not change under UV rays or other weathering effects.
With increasing temperatures, the compressive strength of iglidur® L350 plain bearings decreases. The diagram 02 shows this inverse relationship. The recommended maximum surface pressure is a mechanical material parameter. No conclusions regarding the tribological properties can be drawn from this.
Diagram 03 shows the elastic deformation of iglidur® L350 under different loads. At the recommended maximum surface pressure of 59 MPa the deformation is less than 2,5 % at room temperature. A plastic deformation can be negligible up to this value. It is however also dependent on the duty cycle of the load.
iglidur® L350 has been developed especially for high surface speeds
with low loads. Due to the high
temperature resistance of iglidur® L350, the physical
limit of the bearing has been,
increased significantly. In addition, the extremely
low wear allows long sliding distances to be attained quickly
in the case of high peripheral speeds. The maximum
speeds are shown in adjacent table.
|iglidur® L350||Application temperature|
|Minimum||- 100 °C|
|Max. long-term||+ 180 °C|
|Maximum, short-term||+ 210 °C|
|In addition secure axially from||+ 140 °C|
The iglidur® L350 plain bearings can be used in temperatures up to +210°C for the short-term. Note that a mechanical securing of the bearing is recommended from temperatures of +140°C. Higher temperatures can also cause the bearing to lose its press-fit seating and move in the hole.
The very low coefficient of friction remains, even at high speeds. Diagram 04 shows this relationship on a steel shaft at 0.75 MPa surface pressure.
|C. o. f. µ||0,07 - 0,18||0,06||0,04||0,03|
Diagram 05 compares the wear of a sintered bearing with that of bearings made of the materials iglidur® L500 and L350. At a surface speed of 1.5 m/s or more, the wear of the sintered bearing increases exponentially whereas the wear of the iglidur® plain bearings almost remains the same up to a speed of more than 3 m/s.
A = Aluminium, hard-anodised
B = Free cutting steel
C = Cf53
D = Cf53, hard-chromed
E = St37
F = V2A
G = X90
|to 3||+0,000 +0,010||+0,006 +0,046||–0,025 +0,000|
|> 3 to 6||+0,000 +0,012||+0,010 +0,058||–0,030 +0,000|
|> 6 to 10||+0,000 +0,015||+0,013 +0,071||–0,036 +0,000|
|> 10 to 18||+0,000 +0,018||+0,016 +0,086||–0,043 +0,000|
|> 18 to 30||+0,000 +0,021||+0,020 +0,104||–0,052 +0,000|
|> 30 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 to 180||+0,000 +0,040||+0,043 +0,203||+0,000 +0,100|
iglidur® L350 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).