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Material table
General specification
Unit
iglidur® UW
Test method
density
g/cm³
1,52
Colour
black
max. Moisture absorption at 23°C/50% room humidity.
% by weight
0,2
DIN 53495
max. Water absorption3)
% by weight
0,8
Sliding friction coefficient, dynamic, against steel
μ
0,15-0,35
pv value, max. (dry)
MPa x m/s
0,11
Mechanical specification
flexural modulus
MPa
9.600
DIN 53457
flexural strength at 20°C
MPa
90
DIN 53452
Compressive strength
MPa
70
maximum recommended surface pressure (20°C)
MPa
40
Shore D hardness
78
DIN 53505
Physical and thermal specification
Upper long-term application temperature
°C
+90
upper short-term application temperature
°C
+110
Lower application temperature
°C
-50
thermal conductivity
W/m x K
0,60
ASTM C 177
coefficient of thermal expansion (at 23°C)
K-1 x 10-5
6
DIN 53752
Electrical properties2)
Volume resistivity
Ωcm
< 105
DIN IEC 93
surface resistance
Ω
< 105
DIN 53482
iglidur® UW was developed for underwater applications where the maximum temperatures are well below +100°C. For application temperatures above this limit, the plain bearings from iglidur® UW500 are available. Although iglidur® UW was developed for applications in liquids, it is also suitable for dry operation. This is particularly important for applications that run both dry and under liquids. These applications are often encountered in practice. When the specification of the bearing from iglidur® UW is described in this chapter, dry operation is meant. Unless explicitly stated otherwise.
Mechanical specification
The maximum recommended surface pressure is a mechanical material parameter. Conclusions on the tribology cannot be drawn from this. The compressive strength of iglidur® UW bearings decreases with increasing temperatures. diagram. 02 illustrates this correlation.
diagram. 03 shows the elastic deformation of iglidur® UW under radial load. Under the maximum recommended surface pressure of 40 MPa, the deformation is less than 1 %.
Friction and wear
The roughness of the shafts should not be too smooth in order to avoid a high adhesion effect and the associated increase in friction coefficient. For information on shaft roughness for underwater applications, please contact us.
iglidur® UW
dry
Grease
oil
water
coefficient of friction µ
0,15 - 0,35
0,09
0,04
0,04
Table 04: coefficient of friction for iglidur® UW against steel
(Ra = 1 µm, 50 HRC)
Shaft materials
Diagrams 06 and 07 show an extension of the results of tests carried out with different shaft materials using plain bearings from iglidur® UW. At low loads under rotation, the combinations with the stainless steels high grade steel and V2A achieve the best wear values. The ratios shift with increasing loads. Please note that wear increases significantly with loads > 5 MPa.
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