iglidur® L500 – material data

Material data table

General properties	Unit	iglidur® L500	Testing method
Density	g/cm³	1,53
Colour		black
Max. moisture absorption at 23 °C / 50% r.h.	% weight	0,1	DIN 53495
Max. water absorption	% weight	0,3
Coefficient of surface friction, dynamic, against steel	µ	0,19 - 0,26
pv value, max. (dry)	MPa x m/s	4,0
Mechanical properties
Modulus of elasticity	MPa	12.015	DIN 53457
Flexural strength at 20 °C	MPa	201	DIN 53452
Compressive strength	MPa	70
Recommended max. surface pressure (20 °C)	MPa	70
Shore-D hardness		81	DIN 53505
Physical and thermal properties
Max. long-term application temperature	°C	+250
Max. short-term application temperature	°C	+315
Lower application temperature	°C	-100
Heat conductivity	[W/m x K]	0,45	ASTM C 177
Coefficient of thermal expansion (at 23 °C)	[K^-1 x 10^-5]	6	DIN 53752
Electrical properties
Specific contact resistance	Ωcm	> 10¹⁰	DIN IEC 93
Surface resistance	Ω	> 10¹²	DIN 53482

Table 01: Material properties table

Diagram 01: Permissible pv values for iglidur® L500 bearings running against a steel shaft in dry operation, at +20 °C, mounted in a steel housing

X = Surface speed [m/s]
Y = Load [MPa]

Moisture absorption

The very low moisture absorption of 0.1% by weight in a normal climate and 0.3% by weight at maximum water absorption also enables continuous operation in high humidity or in liquid media.

Diagram 02: Recommended maximum surface pressure as a function of temperature (60 MPa at +20 °C)

X = Temperature [°C]
Y = Load [MPa]

Diagram 03: Deformation under pressure load and temperatures

X = Load [MPa]
Y = Deformation [%]

Mechanical properties

With increasing temperatures, the compressive strength of iglidur® L500 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® L500 at radial load. At the recommended maximum surface pressure of 70 MPa the deformation is less than 2.5 % at room temperature. Plastic deformation can be negligible up to this value. It is however also dependent on the duty cycle of the load.

Maximum running speed

m/s	Rotating	Oscillating	Linear
Continuous	4,0	1,5	5,0
Short-term	5,0	3,0	8,0

Table 03: Maximum surface speeds

Permissible surface speeds

iglidur® L500 has been developed especially for high surface speeds with low loads. Due to the high temperature-resistance of iglidur® L500, the physical limit created from heating of the bearing has been increased significantly. In addition, the extremely low wear allows the high acceleration speeds to be reached and maintained. The maximum speeds are shown in table 03.

Temperatures

The iglidur® L500 bearings can be used in temperatures up to +315° C for the short-term. Note that mechanical securing of the bearing is recommended from temperatures of +130° C. Higher temperatures can also cause the bearing to lose its press-fit seating and move in the bore.

Temperatures, coefficient of thermal expansion

iglidur® W360	Dry	Greases	Oil	Water
C. o. f. µ	0,08 - 0,15	0,09	0,04	0,04

Table 04: Coefficients of friction against steel (Ra = 1 μm, 50 HRC)

Friction and wear

The excellent coefficient of friction level of iglidur® L500 in dry operation once again decreases considerably with speed. Diagram 04 shows this with respect to a steel shaft. As the load increases, the coefficient of friction decreases, especially in the range up to 20 MPa (Diagram 05).

Coefficients of friction

Wear resistance

Diagram 04: Coefficients of friction as a function of the surface speed, p = 1 MPa

X = Surface speed [m/s]
Y = Coefficient of friction μ

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

X = Load [MPa]
Y = Coefficient of friction μ

Diagram 06: Coefficients of friction as function of the shaft surface (Cf53 shaft)

X = Shaft roughness Ra [μm]
Y = Coefficient of friction μ

Shaft materials

Diagram 06 shows the result of a comparison test between iglidur® L500 and a sintered bearing. The wear of the sintered bearing increases exponentially after 1.5 m/s, while the iglidur® L500 bearing retains a nearly constant wear rate up to and over 4 m/s.

Shaft materials

Medium	Resistance
Alcohol	+
Hydrocarbons	+
Greases, oils without additives	+
Fuels	+
Diluted acids	+
Strong acids	+
Diluted alkalines	+
Strong alkalines	+

+ resistant 0 limited resistance – not resistant

All data given at room temperature [+20 °C]
Table 02: Chemical resistance of iglidur® L500

Additional properties

Radiation resistance iglidur® L500 bearings are resistant to radiation up to a radiation intensity of 3 · 102 Gy. Higher radiation weakens the material and may result in a significant decrease in mechanical properties.

UV resistance The material properties of iglidur® L500 bearings do not change under UV rays or other weathering influences.

VacuumIn vacuum, moisture is released as a vapour. Due to its low absorption of water, however, use in a vacuum is possible.

Diameter d1 [mm]	Shaft h9 [mm]	iglidur® L500 F10 [mm]	Housing H7 [mm]
to 3	0 - 0,025	+0,006 +0,046	0 +0,010
> 3 bis 6	0 - 0,030	+0,010 +0,058	0 +0,012
> 6 bis 10	0 - 0,036	+0,013 +0,071	0 +0,015
> 10 bis 18	0 - 0,043	+0,016 +0,086	0 +0,018
> 18 bis 30	0 - 0,052	+0,020 +0,104	0 +0,021

Table 05: Important tolerances according to ISO 3547-1 after being pressed in

Installation tolerances

iglidur® L500 plain bearings are standard bearings for shafts with h-tolerance (recommended minimum h9). The bearings are designed for pressfit into a housing machined to a H7 tolerance. After being assembled into a nominal size housing, 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).