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iglidur® Q - material data

Table of contents

    The most important specifications at a glance

    iglidur Q plain bearings were developed especially for extreme loads. Under high loads, iglidur Q figures among the iglidur materials that by far display the best wear resistance. From a radial load of 25MPa, even plain bearings made from the abrasion-resistant iglidur W300 are exceeded. Specific solid lubricants, precisely integrated into the material, ensure that the maintenance-free dry operation is guaranteed under any load.

    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, dry: 0.05 - 0.15
    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 pivoting applications
    • For very good abrasion resistance, especially under extreme loads
    • For extreme pv values
    • When the bearing needs to be insensitive to dirt

    When do I use a different material?

    Temperatures

    Plain bearings made from iglidur Q retain their excellent wear resistance even at high temperatures. Additional protection is required at temperatures above +50°C. It should also be noted that the coefficient of friction increases sharply depending on the temperature from approx. +100°C.

    Temperatures, coefficient of thermal expansion

    min. application temperatureUpper application temperature, long-termUpper application temperature, short-termIn addition secure axially from
    -40°C+135°C+155°C+50°C

    Permissible surface speeds

    Under extreme radial loads, iglidur Q plain bearing can reach the highest pv values possible in dry operation with iglidur plain bearings. Although iglidur Q plain bearings have the greatest advantages at high loads and low speeds, high surface speeds are also possible due to the excellent coefficient of friction of these bearings. The values given in the table show the speeds at which the temperature rises to the maximum permissible value as a result of friction.

    Surface speeds of various iglidur materials

    Maximum surface speed [m/s]RotatingOscillatinglinear
    Long-term1.00.75.0
    Short-term2.01.46.0

    Permissible pv values

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

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

    Pv value, max. (dry)

    MPa · m/s

    0.55

    <a 0="[" 1="o" 2="b" 3="j" 4="e" 5="c" 6="t" 7=" " 8="O" 9="b" 10="j" 11="e" 12="c" 13="t" 14="]" href="/de-de/website/gleitlager/wiki/p-x-v-wert-und-schmierung" uuid="f16b1d8b-0ff1-4a28-951c-3fbeec74eafd" target="_self">Information on pv value and lubrication

    Mechanical specifications

    The maximum recommended surface pressure is a mechanical material parameter. No conclusions about the tribological properties can be drawn from this. The compressive strength of iglidur Q plain bearings decreases with increasing temperatures. Diagram 02 illustrates this inverse relationship. iglidur Q is a material that is used when high pv values are reached through high loads. Diagram 03 shows the elastic deformation of iglidur Q under radial loads. Under the maximum recommended surface pressure of 100MPa, the deformation at room temperature is less than 3%.

    Diagram 02: Maximum recommended surface pressure as a function of temperature (100MPa at +20°C)

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

    Diagram 03: Deformation under pressure and temperatures

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

    Friction and wear

    Many plastic bearings feature decreasing coefficients of friction with increasing loads in dry operation. iglidur Q exceeds most iglidur plain bearings in this respect: Under high pressures the material offers excellent coefficients of friction (diagrams 04 and 05).

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

    iglidur QdryGreasesOilWater
    Coefficient of friction μ0.05 - 0.150.090.040.04

    Diagram 04: Coefficient of friction as a function of the surface speed, p = 0.75MPa

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

    Diagram 05: Coefficients of friction as a function of the load, v = 0.01m/s

    X = load [MPa]
    Y = coefficient of friction μ

    Shaft materials

    Diagram 06 shows an extract of the results of tests with different shaft materials carried out with plain bearings made from iglidur Q. From 30MPa, the strengths of iglidur heavy-duty materials become apparent. iglidur Q stands out in particular here. Other heavy-duty materials such as iglidur Q2 and TX1 are only well ahead in terms of wear at even higher loads. What is striking about iglidur Q is its good wear on many different shaft materials.

    Further information on shaft materials

    Diagram 06: Wear, rotating application with different shaft materials, p = 30MPa, v = 0.01m/s

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

    A = C45
    B = St52
    C = St52 gas-nitrided
    D = St52 salt bath nitrocarburised
    E = St52 galvanised
    F = 16MnCr5 yellow galvanised
    G = 20MnV6, unhardened, hard-chromed
    H = 38MnV S6, hardened, hard-chromed

    Diagram 07: Wear in oscillating and rotating applications with Cf53 as a function of pressure

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

    A = rotating
    B = oscillating

    Chemical resistance

    iglidur Q plain bearings have very good resistance to chemicals. They have excellent resistance to organic solvents, fuels, oils and greases. The material is only partially resistant to weak acids and weak alkalis.

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

    MediumResistance
    Alcohols+ up to 0
    Greases, oils without additives+
    Hydrocarbons+
    Fuels+
    Strong alkalines0
    Strong acids-
    Diluted alkalines+
    Diluted acids0 to -

    Moisture absorption

    Influence of moisture absorption

    Diagram 10: Influence of moisture absorption

    X = moisture absorption [Gew.-%]
    Y = reduction of inner ø [%]

    The moisture absorption of iglidur Q plain bearings is around 0.9% in standard climatic conditions. The saturation limit in water is 4.9%. This must be taken into account under appropriate operating conditions.

    Maximum moisture absorption

    at +23°C/50% room humidity.

    0.9% weight

    Maximum total moisture absorption

    4.9% weight

    Installation tolerances

    iglidur Q 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 E10 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 Q plain bearing E10 [mm]Shaft h9 [mm]
    up to 3+0.000 +0.010+0.014 +0.054 -0.025 +0.000
    > 3 up to 6+0.000 +0.012+0.020 +0.068 -0.030 +0.000
    > 6 up to 10+0.000 +0.015+0.025 +0.083 -0.036 +0.000
    > 10 up to 18+0.000 +0.018+0.032 +0.102 -0.043 +0.000
    > 18 up to 30+0.000 +0.021+0.040 +0.124 -0.052 +0.000
    > 30 up to 50+0.000 +0.025+0.050 +0.150 -0.062 +0.000
    >50 to 80+0.000 +0.030+0.060 +0.180 -0.074 +0.000
    >80 to 120+0.000 +0.035+0.072 +0.212 -0.087 +0.000
    >120 to 180+0.000 +0.040 +0.085 +0.245 -0.100 +0.000

    Thermal conductivity

    [W/m · K] 0.23

    ASTM C 177

    Coefficient of thermal expansion

    (at +23°C) [K-1 · 10-5] 5

    DIN 53752

    Compressive strength

    89MPa

    Vacuum

    In a vacuum, any moisture present will outgas. Use in a vacuum is only possible for dry bearings made of iglidur Q.

    Radioactive radiation

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

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    Agricultural machinery

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