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iglidur® RW370 – material data

Table of contents

    The most important specifications at a glance

    Fire-retardant, fulfils DIN EN 45545 HL3, R22/R23

    iglidur RW370 was specially developed for the high fire protection requirements in railway technology. It therefore fulfils the requirements of DIN EN 45545. Plain bearings from iglidur RW370 are used in railway technology, primarily in door systems, seat adjusters and hinges.

    Descriptive technical specifications
    Wear resistance at +23°C- 🟧 🟧 🟧 ⬜️ ⬜️ +More information on wear resistance
    Wear resistance at +90°C- 🟧 🟧 🟧 ⬜️ ⬜️ +
    Wear resistance at +150°C- 🟧 🟧 🟧 ⬜️ ⬜️ +
    Slide property- 🟧 🟧 🟧 🟧 ⬜️ +Coefficient of friction, dynamic, against steel: µ 0.13 - 0.17
    Wear resistance under water- 🟧 🟧 ⬜️ ⬜️ ⬜️ +
    Media resistance- 🟧 🟧 🟧 ⬜️ ⬜️ +More information on media resistance
    Resistant to edge pressures- 🟧 🟧 🟧 🟧 ⬜️ +
    Resistant to shock and impact loads- 🟧 🟧 🟧 🟧 ⬜️ +
    Dirt resistance- 🟧 🟧 🟧 ⬜️ ⬜️ +

    When do I use this material?

    • For applications in railway technology that require suitability in accordance with DIN EN 45545
    • When high wear resistance at low to medium pressure loads is required
    • When low coefficients of friction in dry operation are required
    • Low moisture absorption

    When do I use a different material?

    • If high pressure loads occur and suitability according to DIN EN 45545 is not required -> iglidur G, iglidur W300
    • When temperatures of short-term greater than +190°C occur -> iglidur G, iglidur Z
    • If a cost-effective plain bearing is required for occasional movements -> iglidur G

    Temperature

    The maximum permissible short-term temperature is +190°C, which means that iglidur RW370 plain bearings can also be used in all applications with increased ambient temperatures. The compressive strength of iglidur RW370 plain bearings decreases with increasing temperatures. When considering temperature, the additional frictional heat in the bearing system must be taken into account. At temperatures above +120°C, additional protection is required.

    Temperatures, coefficient of thermal expansion

    min. application temperatureUpper application temperature, long-termUpper application temperature, short-termIn addition secure axially from
    -50°C+170°C+190°C+120°C

    Permissible surface speeds

    Even if the typical application areas for iglidur RW370 plain bearings are more likely to be seen in intermittent operation, the maximum achievable speeds are still considerable depending on the type of movement. The speeds given in the table are limit values for the lowest bearing loads. At higher loads, the permissible speed decreases with the load due to the limitations of the pv value.

    Surface speeds of various iglidur materials

    Maximum surface speeds [m/s]RotatingOscillatinglinear
    Long-term0.90.62.5
    Short-term1.00.82.6

    Permissible pv values

    Diagram 01: Permitted pv values for iglidur® RW370

    Diagram 01: Permissible pv values for iglidur RW370 plain bearings with 1mm wall thickness in dry operation against a steel shaft, at +20°C, installed in a steel housing.

    X-axis = surface speed [m/s]
    Y-axis = pressure [MPa]

    pv value, max. (dry)

    MPa - m/s

    1,20

    Information on pv value and lubrication

    Mechanical specifications

    The compressive strength of iglidur RW370 plain bearings decreases with increasing temperatures. Diagram 02 illustrates this relationship. The maximum recommended surface pressure represents a mechanical material parameter. Conclusions about the tribology cannot be drawn from this. Diagram 03 shows the elastic deformation of iglidur RW370 under radial load. Possible plastic deformation depends, among other things, on the duration of the duty cycle.

    Diagram 02: Maximum recommended surface pressure as a function of temperature (75MPa at +20°C)

    X = temperature [°C]
    Y = pressure [MPa]

    Diagram 03: Deformation under load and temperatures

    X = load [MPa]
    Y = deformation [%]

    Friction and wear

    Diagram 04: Coefficients of friction as a function of the surface speed, p = 1MPa

    X = surface speed [m/s]
    Y = coefficient of friction μ

    The very good coefficient of friction of iglidur RW370 in dry operation decreases even further with speed up to a value of 1.1m/s. Diagram 04 shows this relationship on a steel shaft. From a speed of 1.25m/s, however, the coefficient of friction rises sharply as the load limit of the material is reached.

    Coefficient of friction against steel (Ra = 1μm, 50HRC):

    iglidur RW370dryGreasesOilWater
    Coefficient of friction μ0.13 - 0.170.090.040.04

    Shaft materials

    Diagrams 06 and 07 show an extension of the results of tests with different shaft materials, which were carried out with plain bearings from iglidur RW370. At 0.3m/s and 1MPa surface pressure, shafts made of hard anodised aluminium and hard chrome-plated Cf53 are the most suitable mating surfaces. Shafts made of 304 stainless steel or high grade steel also deliver good results. If your intended shaft material is not included in the test results presented here, please contact us.

    Further information on shaft materials

    Diagram 05: Wear, rotating with different shaft materials, p = 1MPa, v = 0.3m/s

    X = shaft material
    Y = wear [μm/km]

    Diagram 06: Wear in oscillating and rotating applications with steel, Cf53, hardened, ground as a function of the pressure

    X = pressure [MPa]
    Y = wear [μm/km]

    Chemical resistance

    All data at room temperature [+20 °C],     + resistant      0 conditionally resistant      - non-resistant

    ChemicalsResistance
    Alcohols+ up to 0
    Greases, oils without additives+
    Hydrocarbons-
    Fuels+ up to 0
    Strong alkalines-
    Strong acids-
    Diluted alkalines+
    Diluted acids+

    Installation tolerances

    iglidur RW370 plain bearings are standard bearings for shafts with h-tolerance (recommended minimum h9). The bearings are designed for press-fit into a housing machined to a H7 tolerance. After installation in a housing with nominal dimensions, the inner diameter of the bearings with F10 tolerance adjusts automatically. For certain dimensions, the tolerance deviates from this depending on the wall thickness (see product range).

    Important tolerances according to ISO 3547-1 after press-fit:

    Diameter d1 [mm]Housing H7 [mm]iglidur RW370 plain bearing F10 [mm]Shaft h9 [mm]
    up to 3+0.000 +0.010+0.006 +0.046-0.025 +0.000
    > 3 up to 6+0.000 +0.012+0.010 +0.058-0.030 +0.000
    > 6 up to 10+0.000 +0.015+0.013 +0.071-0.036 +0.000
    > 10 up to 18+0.000 +0.018+0.016 +0.086-0.043 +0.000
    > 18 up to 30+0.000 +0.021+0.020 +0.104-0.052 +0.000
    > 30 up to 50+0.000 +0.025+0.025 +0.125-0.062 +0.000
    >50 to 80+0.000 +0.030+0.030 +0.150-0.074 +0.000
    >80 to 120+0.000 +0.035+0.036 +0.176-0.087 +0.000
    > 120 up to 180+0.000 +0.040+0.043 +0.203+0.000 +0.100

    Thermal conductivity

    [W/m · K] 0.22

    ASTM C 177

    Coefficient of thermal expansion

    (at +23°C) [K-1 · 10-5] 5

    DIN 53752

    Compressive strength

    129MPa

    Moisture absorption

    The moisture absorption of iglidur RW370 plain bearings in a normal climate is less than 0.25% weight. The saturation limit in water is 1.2% weight.

    Vacuum

    In a vacuum, moisture outgases. However, due to the low total moisture absorption, use in a vacuum is possible.

    Radioactive rays

    Plain bearings made of iglidur RW370 are resistant to radiation up to a radiation intensity of 3 · 102 Gy

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    Typical application areas

    Door guides and hinges, rotating joints, access steps, seat and table mechanisms

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