iglidur® P230 - material data

Diagram 02: Recommended maximum surface pressure of a function of temperature (60 MPa at +20 °C)
 
X = Temperature [°C]
Y = Load [MPa]

Mechanical properties

With increasing temperatures, the compressive strength of iglidur® P230 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: Deformation under pressure and temperature
 
X = Load [MPa]
Y = Deformation [%]

Diagram 03 shows the elastic deformation of iglidur® P230 as a function of radial pressure. At the recommended maximum surface pressure of 60 MPa the deformation is less than 3 % 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.

Maximum running speed

m/s	Rotating	Oscillating	linear
Continuous	1,0	0,7	3,0
Short-term	2,0	1,4	4,0

Table 02: Maximum surface speeds

Permissible surface speeds

iglidur® P230 was developed for low to average surface speeds. During continuous operation, a maximum speed of 1.0 m/s (rotating) or 3.0 m/s (linear) is permissible. The maximum values shown in table 02 can only be achieved at low pressures. At the given speeds, friction can cause a temperature increase to the maximum continuously permissible level. In practice, though, this level is rarely reached due to varying application conditions.

iglidur® P230	Application temperature
Minimum	-30°C
Max. long-term	+110°C
Maximum, short-term	+180°C
In addition secure axially from	+100°C

Table 03: Temperature limits

Temperature

Also thanks to its maximum long-term application temperature of +110°C, iglidur® P230 is suitable for a wide range of applications. If even higher temperatures are required, the best-seller iglidur® G (+130°C) or the new standard iglidur® G1 (+180°C) are available. The temperatures prevailing in the bearing system also have an influence on the wear. When temperatures rise, wear increases as well. For temperatures over +100°C an additional securing is required.

Diagram 04: Coefficient of friction as a function of the surface speed, p = 1MPa
 
X = Surface speed [m/s]
Y = Coefficient of friction μ

Friction and wear

Similar to wear resistance, the coefficient of friction µ also changes with the load (Diagram 04).
 

iglidur® P230	Dry	Greases	Oil	Water
C. o. f. µ	0,13 - 0,32	0,09	0,04	0,04

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

Diagram 05: Wear, rotating with different shaft materials, pressure, p = 1MPa, v = 0.3m/s
 
X = Shaft material
Y = Wear [μm/km]

Shaft materials

Diagram 05 shows results of testing different shaft materials with plain bearings made from iglidur® P230. For rotating movements with 1 MPa radial load, wear on all shafts is low, with the "soft" shaft types providing the higher coefficients of wear. The comparison of pivoting and rotating movements (diagram 06) shows fewer differences than with many other iglidur® materials. The limitation of iglidur® P230 to low to medium loads becomes clear.

Diagram 06: Wear for oscillating and rotating applications with shaft material Cf53 hardened and ground steel, as a function of the load
 
X = Load [MPa]
Y = Wear [μm/km]

Chemicals	Resistance
Alcohol	+ up to 0
Hydrocarbons	+
Greases, oils without additives	+
Fuels	+
Diluted acids	+
Strong acids	+
Diluted alkalines	+
Strong alkalines	+

+ resistant      0 limited resistance      - non-resistant
 
All information given at room temperature [+20°C]
Table 04: Chemical resistance

Moisture absorption

The humidity absorption of iglidur® P230 bearings amounts to about 0.1 % weight in standard climatic conditions. The saturation limit in water is 0.3 %weight. This low moisture absorption is well below the values of iglidur® M250 or iglidur® G.

Radiation resistance

Plain bearings made from iglidur® P230 have limited use under radioactive radiation. They are resistant up to a radiation intensity of 3 - 10² Gy.

UV resistance

iglidur® P230 bearings have a good resistance to UV radiation.

Vacuum

In vacuum, any present moisture is released as vapour. Use in vacuum is only possible with dehumidified iglidur® P230 bearings.

Electrical properties

iglidur® P plain bearings are electrically insulating.

Specific volume resistance	> 1012 Ωcm
Surface resistance	> 1011 Ω

Ø d1 [mm]	Housing H7 [mm]	Plain bearing E10 [mm]	Shaft h9 [mm]
to 3	+0,000 +0,010	+0,014 +0,054	-0,025 +0,000
> 3 to 6	+0,000 +0,012	+0,020 +0,068	-0,030 +0,000
> 6 to 10	+0,000 +0,015	+0,025 +0,083	-0,036 +0,000
> 10 to 18	+0,000 +0,018	+0,032 +0,102	-0,043 +0,000
> 18 to 30	+0,000 +0,021	+0,040 +0,124	-0,052 +0,000
> 30 to 50	+0,000 +0,025	+0,050 +0,150	-0,062 +0,000
> 50 to 80	+0,000 +0,030	+0,060 +0,180	-0,074 +0,000
> 80 to 120	+0,000 +0,035	+0,072 +0,212	-0,087 +0,000
> 120 to 180	+0,000 +0,040	+0,085 +0,245	-0,100 +0,000

Table 05: Important tolerances for plain bearings according to ISO 3547-1 after press-fit

 

Installation tolerances

iglidur® P230 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, the inner diameter automatically adjusts to the E10 tolerances. For particular dimensions the tolerance differs depending on the wall thickness (please see product range table).