Page 573 - IGUS Bearing
P. 573

iglidur  UW                                                                                                                                                                                                             iglidur  UW
                                                                                                                                                                                                                                     ®
             ®
          +90°C                                                                                                                                                                                                                   +90°C
          40MPa                                                                                                                                                                                                                   40MPa
                      Bearing technology | Plain bearings | iglidur  UW                                                             Technical data
                                                                                                    ®
                                                                                                                                      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
                                   ®
                      ● 	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
                                                                                                                                         ®
                                                                                                                                    which the maximum temperatures are lower than +100°C.   Plain bearings made from iglidur  UW are resistant up to
                                                                                                                                                                                                                  ®
                                                                                                                                    For application temperatures above this limit, the plain   a radiation intensity of 3 · 10² Gy.
          Guide rings
                                                                                                                                                          ®
          Page 641                                                                                                                  bearings made from iglidur  UW500 are available. Though
                                                                                                                                    iglidur  UW was developed for application in liquids, it is also   Resistance to weathering
                                                                                                                                        ®
                       Descriptive technical specifications                                                                         suitable for dry operation. This one is particularly important   iglidur  UW plain bearings have limited resistance
                                                                                                                                                                                             ®
                       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.
                                                                                                                                                                               ®
          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
                                                                                                                                                                                            ®
                                                                                                                                    The moisture absorption of iglidur  UW plain bearings in   this inverse relationship. The maximum recommended
                                                                                                                                                                ®
                       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
                                                                                                                                                                                                                                  ®
                       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

              ®
          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
   568   569   570   571   572   573   574   575   576   577   578