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iglidur® W300 - Material data

Materials table

General features Unit iglidur® W300 test method
Density g/cm³ 1,24
Colour yellow
Max. humidity absorption at 23°C/50% R. H. % weight 1,3 DIN 53495
Max. water absorption % weight 6,5
Coefficient of surface friction, dynamic, against steel µ 0,08 - 0,23
PV values max. (dry) MPa x m/s 0,23

Mechanical properties
Bending E-module MPa 3.500 DIN 53457
Tensile strength at +20 °C MPa 125 DIN 53452
compressive strength MPa 61
Maximum recommended surface pressure (20° C) MPa 60
Shore D hardness 77 DIN 53505

Physical and thermal properties
Max. long term application temperature °C +90
Max. short term application temperature °C +180
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

Electrical properties
Specific forward resistance Ωcm > 1013 DIN IEC 93
Surface resistance Ω > 1012 DIN 53482
'Table 01: Material Data

Permissible pv values for iglidur® W300

Figure 01: Permitted PV values for iglidur® W300 bearings with 1 mm wall thickness in dry operation against a steel shaft, at 20°C, installed in a steel housing.

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


The iglidur® W300 offers high wear resistance, also for rugged shafts or especially abrasive surrounding media. Among all materials of the iglidur® series, this material has the greatest resistance to external influences.

Figure 02: Maximum recommended surface pressure dependent on the temperature (60 MPa to +20 °C)

X = Temperature [°C]
Y = Load [MPa]


Figure 03: Deformation under load and temperatures

X = Load [MPa]
Y = Deformation [m/s]

Mechanical properties

With increasing temperatures, the compressive strength of iglidur® W300 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.



iglidur® W300 shows a very high compressive strength despite high elasticity. Figure 03 shows the elastic deformation of iglidur® W300 with radial loads. Under the maximum recommended surface pressure of 60 MPa, the deformation at room temperature amounts to less than 3 %.

Maximum surface speed

m/s Rotary oscillating Linear
Constant 1 0,7 4
Short-term 2,5 1,8 6

Table 02: Maximum surface speeds

Permitted surface speeds

Even at higher surface speeds, the coefficients of friction of iglidur® W300 bearings do not increase. Therefore compared to other materials it can attain slightly higher surface speeds, for instance up to 1.5 m/s rotating and up to 5 m/s linear. Due to the extraordinary wear resistance, the bearing wear remains low also in long-term application with high speeds. Extremely high speeds can be attained with iglidur® W300 bearings on hardened, not too smooth shafts.

Temperature limits

iglidur® W300 Operating temperature
Lower - 40 °C
Upper, long-term + 90 °C
Upper, short-term + 180 °C
Secure axially in addition + 60 °C

Table 03: Temperature limits for iglidur® W300


iglidur® W300 bearings retain their extraordinary abrasion resistance even up to the maximum permitted application temperatures and do not tend to become brittle at low temperatures. An additional securing is recommended at temperatures higher than +60°C.

iglidur® W300 Dry Grease Oil Water
Coefficients of friction µ 0,08 - 0,23 0,09 0,04 0,04

Table 03: Temperature limits for iglidur® W300

Friction and wear

Just like the wear resistance, the coefficient of friction µ, friction coefficient in short, also alters with the load. In contrast to other iglidur® materials, the coefficient of friction of the iglidur® W300 remains constantly low even at higher peripheral speeds.

Fig. 04: Coefficients of friction according to the surface speed, p = 0.75 MPa, Cf53 shaft

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


Fig. 05: Coefficients of friction dependent on the load v=0,01 m/s

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

Wear with various shaft materials

Fig. 06: Wear with various shaft materials p = 1 MPa, v = 0.3 m/s
X = Shaft material
Y = Wear [μm/km]
A = Aluminum, hard-anodized
B = machining steel
C = Cf53
D = Cf53, hard chrome-plated
E = St37
F = V2A
G = X90

Shaft materials

Friction and wear also depend to a high degree on the reverse partner. Very smooth shafts increase the coefficient of both friction and wear. Smooth shafts entail the danger of stick-slip. The squeaking noise as an effect of stick-slip is often the result of extremely smooth shafts. Shaft surface finishes of 0.4 to 0.5 µm are the best. For the iglidur® W300, the wear resistance is still excellent with this surface finish as the friction adopt the minimum value. Figure 06 shows a summary of the results of tests with different shaft materials. At high loads, hardened shafts should be chosen. Please contact us in case the shaft material scheduled by you is not included here.

Wear in oscillating and rotating applications

Fig. 07: Wear at rotating or oscillating motions with CF53 shaft material dependent on the load
X = Load [MPa]
Y = Wear [μm/km]
A = rotating
B = oscillating


Medium Resistance
Alcohols + to 0
Hydrocarbons +
Fats, oils, without additives +
Fuels +
Diluted acids 0 to -
Strong acids -
Diluted bases +
Strong bases 0
+ resistant      0 partially resistant      - non-resistant
All specifications at room temperature [+20°C] Table 05: Chemical resistance of iglidur® W300

Electrical properties

Specific forward resistance > 1013 Ωcm
Surface resistance > 1012 Ω

Chemical resistance

iglidur® W300 bearings have a good resistance against chemicals. They are resistant to most lubricants. The iglidur® W300 is not affected by most weak organic and inorganic acids.

Radioactive rays

iglidur® W300 bearings are radiation resistant up to a radioactive intensity of 3 · 102 Gy.


igubal® W300 plain bearings are permanently resistant against UV rays. A slight colour change influences the properties only insignificantly.


In vacuum, iglidur® W300 plain bearing degases. The use in vacuum is possible only limitedly.

Electrical properties

Bearings made of iglidur® W300 are electrically insulating.

Maximum moisture absorption
by +23 °C/50 % r. F. 0,2 Wt.-%
Max. water absorption 0,4 Wt.-%

Table 06: Moisture absorption

Effect of moisture absorption on plain bearings

Diagram 10: Effect of moisture absorption
X = Moisture absorption [weight %]
Y = Reduction of inside diameter [%]

humidity absorption / moisture absorption

The humidity absorption of iglidur® W300 bearings amounts to about 1.3 Wt.-% in standard climatic conditions. The saturation limit in water is 6,5 %. This should be considered according to environmental influences.

d1 [mm]
h9 [mm]
iglidur® W300
E10 [mm]
Housing H7
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
> 80 to 120 0 - 0,087 +0,072 +0,212 0 +0,035
>120 to 180 0 - 0,100 +0,085 +0,245 0 +0,040

Table 07: Important tolerances for iglidur® W300 bearings according to ISO 3547-1 after the press-in.

Installation tolerances

iglidur® W300 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 )