Page 572 - IGUS Bearing

iglidur UW iglidur UW
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+90°C +90°C
40MPa 40MPa
Bearing technology | Plain bearings | iglidur UW Technical data
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General properties Testing method

Density g/cm³ 1.52 -50°C up to
Ø Colour black +90°C
3.0-20.0mm
Max. moisture absorption at +23°C/50% r.h. % weight 0.2 DIN 53495
Max. moisture absorption 6) % weight 0.8
Coefficient of friction, dynamic, against steel µ 0.15-0.35 40MPa
pv value, max. (dry) MPa · m/s 0.11
Also available
as: Mechanical properties
For fast rotation under water Flexural modulus MPa 9,600 DIN 53457
MPa
Flexural strength at +20°C
90
DIN 53452
Extreme wear resistance in liquid under continuous Compressive strength MPa 70
Bar stock, Max. permissible surface pressure (+20°C) MPa 40
round bar operation
Page 743 Shore D hardness 78 DIN 53505
Physical and thermal properties
The best iglidur plain bearing for underwater applications. The first choice for pumping applications. Max. application temperature long-term °C +90
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● Suitable for underwater applications Max. application temperature short-term °C +110 FOOD
● For fast and constant rotation Min. application temperature °C -50
Bar stock, ● Long service life Thermal conductivity W/m · K 0.60 ASTM C 177
plate ● Lubrication-free -1 -5
Page 773 Coefficient of thermal expansion (at +23°C) K · 10 6 DIN 53752
● Maintenance-free Electrical properties 5)
Specific transitional resistance Ωcm < 10 5 DIN IEC 93
Typical application areas Surface resistance Ω < 10 5 DIN 53482
● Fluid technology 5) The good conductivity of this material can favour the generation of corrosion on the metallic contact components.
● Pumps 6)
tribo-tape liner All results were obtained under laboratory conditions with demineralised water. For application with direct water
Page 781 contact, we recommend tests under real application conditions.
Table 01: Material properties

iglidur UW was developed for underwater applications in Radiation resistance
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which the maximum temperatures are lower than +100°C. Plain bearings made from iglidur UW are resistant up to
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For application temperatures above this limit, the plain a radiation intensity of 3 · 10² Gy.
Guide rings
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Page 641 bearings made from iglidur UW500 are available. Though
iglidur UW was developed for application in liquids, it is also Resistance to weathering
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Descriptive technical specifications suitable for dry operation. This one is particularly important iglidur UW plain bearings have limited resistance
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Wear resistance at +23°C – + in applications that call for both dry and wet operations. to weathering. The material properties are affected.
These applications can be seen often in practice. Discolouration occurs. Practical tests under real application
Wear resistance at +90°C – +
The features of the bearings made from iglidur UW conditions are recommended.
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Two hole Wear resistance at +150°C – + described in this section apply to the dry operation. Unless
flange
bearings it is expressly mentioned otherwise. Mechanical properties
Page 667 Slide property – +
With increasing temperatures, the compressive strength of
Wear resistance under water – + Moisture absorption iglidur UW plain bearings decreases. Diagram 02 shows
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The moisture absorption of iglidur UW plain bearings in this inverse relationship. The maximum recommended
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Media resistance – +
ambient conditions is approximately 0.2% weight. The surface pressure is a mechanical material parameter. No
Moulded Resistant to edge pressures – + saturation limit submerged in water is 0.8% weight. These conclusions regarding the tribological properties can be
special parts values are so low that a moisture expansion need to be drawn from this.
Page 696 Resistant to shock and impact loads – +
considered only in extreme cases. Diagram 03 shows the elastic deformation of iglidur UW
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Dirt resistance – + under different loads. At the maximum recommended
Vacuum surface pressure of 40MPa, the deformation is less than 1%.
In vacuum, any present moisture is released as vapour. Surface pressure, page 45

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igubal Online product finder Online service life calculation The use in vacuum is only possible to a limited extent.
spherical balls
Page 993 www.igus-asean.com/iglidur-finder www.igus-asean.com/iglidur-expert ASEAN 09/2023 ASEAN 09/2023
570 3D-CAD, finder and service life calculation ... www.igus-asean.com/UW Lubrication-free made easy ... from stock ... no minimum order quantity 571