iglidur® W300 - Material data

The most important specifications at a glance

Good wear resistance at room temperature
Excellent friction coefficients
Low moisture absorption
High media resistance
Resistant to edge pressure
Resistant to shocks and impacts
Resistant to dirt and dust
Resistant to high loads (>60N/mm²)

When do I use this material?

When an economical all-round performance bearing is required
For low to average surface speeds
When the bearing needs to run on different shaft materials
For pivoting and rotational movements

When do I use a different material?

When mechanical rework is required
iglidur® M250, sleeve bearing
When universal chemical resistance is required
iglidur® X, sleeve bearing
When temperatures are constantly higher than +130°C
iglidur® H, sleeve bearing
iglidur® X, sleeve bearing
iglidur® H370, sleeve bearing
When used under water
iglidur® H370, sleeve bearing

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.

Surface speed

p x v value and lubrication

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.

Coefficients of friction

Wear resistance

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

Shaft materials

The friction and wear are also dependent, to a large degree, on the counter partner. Shafts that are too smooth, increase both the coefficient of friction and the wear of the bearing. Smooth shafts have the danger of stick-slip. Squeaking as an effect of stick-slip is usually the result of shafts that are too smooth. Shaft finishes of 0.4 to 0.5μm have proven best. For iglidur® W300, the wear resistance is still excellent with this surface finish as the friction adopts the minimum value. Diagram 06 shows results of testing different shafts. Hardened shafts are preferred for applications for higher loads. If the shaft material you intend to use is not included in the test results presented here, please contact us.
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

Wear in oscillating and rotating applications

Diagram 07: Wear on oscillating and rotating applications with shaft material Cf53 dependent on the load

X = load [MPa]
X = load [MPa]

A = rotating
B = oscillating

Diameter d1 [mm]	Shaft h9 [mm]	iglidur® W300 E10 [mm]	Housing H7 [mm]
up to 3	0 - 0.025	+0.014 +0.054	0 +0.010
> 3 up to 6	0 - 0.030	+0.020 +0.068	0 +0.012
> 6 up to 10	0 - 0.036	+0.025 +0.083	0 +0.015
> 10 up to 18	0 - 0.043	+0.032 +0.102	0 +0.018
> 18 up to 30	0 - 0.052	+0.040 +0.124	0 +0.021
> 30 up 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 plain bearings according to ISO 3547-1 after press-fit

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 )

Additional properties

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.

UV-resistant

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

Vacuum

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.

Typical application areas

iglidur® W300 - Material data

The most important specifications at a glance

When do I use this material?

When do I use a different material?

Maximum surface speed

Permitted surface speeds

Friction and wear

Shaft materials

Installation tolerances

Additional properties

Electrical properties

Chemical resistance

Radioactive rays

UV-resistant

Vacuum

Electrical properties

Typical application areas

Woodworking industry

Printing industry

Beverage industry