iglidur® P - material data

The most important specifications at a glance

Due to thermal stability and low total moisture absorption, the iglidur P plain bearings are among the most dimensionally strong all-round bearings under varying environmental conditions. iglidur P plain bearings are recommended for pivoting and rotational movements at average loads.

Descriptive technical specifications
Wear resistance at +23°C	- 🟧 🟧 🟧 ⬜️ ⬜️ +	More information on wear resistance
Wear resistance at +90°C	- 🟧 🟧 🟧 ⬜️ ⬜️ +
Wear resistance at +150°C	- 🟧 ⬜️ ⬜️ ⬜️ ⬜️ +
Sliding properties	- 🟧 🟧 🟧 🟧 ⬜️ +	Coefficient of friction, dynamic, against steel: 0.06 - 0.21µ
Wear resistance under water	- 🟧 🟧 🟧 ⬜️ ⬜️ +
Media resistance	- 🟧 🟧 🟧 ⬜️ ⬜️ +	More information on media resistance
Resistant to edge pressures	- 🟧 🟧 🟧 🟧 ⬜️ +
Resistant to shock and impact loads	- 🟧 🟧 🟧 🟧 ⬜️ +
Dirt resistance	- 🟧 🟧 🟧 🟧 ⬜️ +

When to use it?

When low moisture absorption is required
When a cost-effective plain bearing for high pressure loads is required
When higher precision is required at humidity and medium temperatures

When not to use it?

If the maximum application temperature is above +120°C -> iglidur K
When mechanical rework is required -> iglidur M250
When highest wear resistance is required -> iglidur W300

Download data sheet

Temperatures

Even with its highest long-term application temperature of +130°C, iglidur P does not quite reach the values of iglidur G. The temperatures prevailing in the bearing system also have an influence on bearing wear. Rising temperatures mean higher wear.

min. application temperature	Upper application temperature, long-term	Upper application temperature, short-term	In addition secure axially from
-40°C	+130°C	+200°C	+90°C

Permissible surface speeds

Plain bearings from iglidur P are maintenance-free plain bearings that have been developed for low to medium sliding speeds. The maximum values given in the table can only be achieved at very low surface pressures. The specified maximum speed is the speed at which friction can lead to an increase up to the permanently permissible temperature.

Surface speeds of various iglidur materials

Maximum surface speeds [m/s]	Rotating	Oscillating	linear
permanent	1.0	0.7	3.0
Short-term	2.0	1.4	4.0

Permissible p x v values

iglidur P plain bearing provides the user with cost-effective, maintenance-free plain bearings. Compared to iglidur G, plain bearings made from iglidur P are more suitable for rotating movements and high loads.

pv value, max. (dry): 0.39 [MPa · m/s]

Information on pv value and lubrication

Mechanical specifications

The maximum recommended surface pressure is a mechanical material parameter. Conclusions about the tribology cannot be drawn from this. The compressive strength of iglidur P plain bearings decreases with increasing temperatures. Diagram 02 illustrates this relationship. Diagram 03 shows the elastic deformation of iglidur P under radial loads. Under the maximum recommended surface pressure of 50MPa, the deformation is less than 4%.

Friction and wear

The coefficient of friction decreases with increasing load, as does the wear resistance (diagrams 04 and 05). iglidur P plain bearings reach a pronounced minimum coefficient of friction for shafts with a surface finish of 0.1 to 0.2μm. Both smoother and rougher shafts cause the friction to increase significantly.

Coefficients of friction for iglidur P against steel (Ra = 1µm, 50HRC):

iglidur P	dry	Greases	Oil	Water
Coefficient of friction μ	0.06 - 0.21	0.09	0.04	0.04

Diagram 04: Coefficient of friction as a function of the surface speed, p = 0.75MPa

X = surface speed [m/s]
Y = coefficient of friction μ

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

X = load [MPa]
Y = coefficient of friction μ

Shaft materials

Diagram 06 shows results of testing different shaft materials with plain bearings made from iglidur P. With rotating movements, the wear of iglidur P with Cf53 and HR carbon steel shafts is very low. In contrast, the bearings are worn out more heavily even in the lower load range, especially with hard chrome-plated shafts, than with other shaft materials. At a load of 2MPa, for example, Cf53 is six times superior to 304 SS. On the other hand, the "soft" HR carbon steel shaft is significantly less favourable than the hardened shaft materials or even 304 SS shafts during pivoting movements.

Further information on shaft materials

Installation tolerances

iglidur P 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 installation in a housing with nominal dimensions, the inner diameter of the bearing with E10 tolerance adjusts itself automatically. For certain dimensions, the tolerance deviates depending on the wall thickness (see product range).

Important tolerances according to ISO 3547-1 after the press-fit:

Diameter d1 [mm]	Housing H7 [mm]	iglidur P plain bearing E10 [mm]	Shaft h9 [mm]
up to 3	+0.000 +0.010	+0.014 +0.054	-0.025 +0.000
> 3 up to 6	+0.000 +0.012	+0.020 +0.068	-0.030 +0.000
> 6 up to 10	+0.000 +0.015	+0.025 +0.083	-0.036 +0.000
> 10 up to 18	+0.000 +0.018	+0.032 +0.102	-0.043 +0.000
> 18 up to 30	+0.000 +0.021	+0.040 +0.124	-0.052 +0.000
> 30 up 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 up to 180	+0.000 +0.040	+0.085 +0.245	-0.100 +0.000

Moisture absorption

The moisture absorption of iglidur P plain bearings is around 0.2% in a normal climate. The saturation limit in water is 0.4%. This low moisture absorption is well below the values of iglidur G.

Maximum moisture absorption (at +23°C/50% room humidity):

0.2% weight

Max. total moisture absorption:

0.4% weight

Chemical resistance

iglidur P plain bearings have good resistance to chemicals. They are resistant to most lubricants. Most weak organic and inorganic acids do not attack iglidur P.

All data at room temperature [+20 °C], + resistant 0 conditionally resistant - non-resistant

Medium	Resistance
Alcohols	+
Greases, oils without additives	+
Hydrocarbons	-
Fuels	+
Strong alkalines	-
Strong acids	-
Diluted alkalines	-
Diluted acids	0

Thermal conductivity

[W/m x K] 0.25

ASTM C 177

Coefficient of thermal expansion

(at +23°C) [K-1 · 10-5] 4

DIN 53752

Resistance to weathering

iglidur P plain bearings are permanently resistant to weathering. The material properties deteriorate only slightly. Any discolouration that may occur is only of a superficial nature.

Compressive strength

66MPa

Vacuum

In a vacuum, any moisture present will outgas. Use in a vacuum is only possible to a limited extent.

Radioactive radiation

Plain bearings made of iglidur P can be used to a limited extent under radioactive radiation. They are resistant up to a radiation intensity of 5 · 10² Gy.