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iglidur® T220 - material data

Table of contents

    The most important specifications at a glance

    iglidur T220 is a special material for applications in the tobacco processing industry. It fulfils the demands of the tobacco industry (engineering database). The material is free of undesirable or banned ingredients, as requested by reputed manufacturers from 2004 onward.

    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 0.20 - 0.32
    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?

    • If my plain bearings should be free of ingredients that are undesirable or prohibited in the tobacco industry
    • If FDA conformity is required

    When do I use a different material?

    • When high surface pressures occur -> iglidur Z
    • When a cost-effective all-round plain bearing is required -> iglidur G, iglidur M250
    • When maximum wear resistance with low pressure loads is required -> iglidur J

    Temperatures

    The flexibility of the bearings depends on the temperature. Even +60°C leads to a significant increase in flexibility. An additional safety device is required for temperatures above +50°C.

    Temperatures, thermal expansion coefficient

    min. application temperatureUpper application temperature, long-termUpper application temperature, short-termIn addition secure axially from
    -40°C+100°C+160°C+50°C

    Permissible surface speeds

    The maximum surface speed of iglidur T220 plain bearings is 0.4m/s when rotating continuously. The friction and the associated heating limit the permissible speeds. This means that higher speeds can be used in intermittent or linear operation.

    Surface speed of various iglidur materials

    Maximum surface speeds [m/s]RotatingOscillatinglinear
    Long-term0.40.31.0
    Short-term1.00.72.0

    Permissible pv values

    pv values T220
    pv values T220

    Diagram 01: Permissible pv values for iglidur T220 plain bearing 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

    0,28

    Information on pv value and lubrication

    Mechanical specifications

    The maximum recommended surface pressure is a mechanical material parameter. Conclusions about the tribology cannot be drawn from this. The compressive strength of iglidur T220 plain bearings decreases with increasing temperatures. Diagram 02 illustrates this relationship. iglidur T220 plain bearings can be loaded up to the permissible limit of 45MPa. The deformation is then almost 2%. The permissible load is further limited by higher temperatures (diagram 02).

    Diagram 02: Maximum recommended surface pressure as a function of temperature (40MPa at +20°C)

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

    Diagram 03: Deformation under load and temperatures

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

    Friction and wear

    By complying with the specifications of the tobacco processing industry, the friction and wear values of the iglidur T220 plain bearings clearly lag behind those of the best iglidur plain bearing. The coefficient of friction decreases with the load while it only increases slightly at higher speeds.

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

    iglidur T220dryGreasesOilWater
    Coefficient of friction μ 0.20 - 0.320.090.040.04

    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 test results with different shaft materials, which were carried out with plain bearings made of iglidur T220. Diagram 07 shows that the bearings react with a strong increase in wear when the load is increased. Care should therefore be taken to keep the load below 5MPa by dimensioning the bearings sufficiently.

    Further information on shaft materials

    Diagram 06: Wear, rotating application with different shaft materials, p = 1MPa, v = 0.3m/s

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

    A = aluminium, hard-anodised
    B = free cutting steel
    C = Cf53
    D = Cf53, hard-chromed
    E = HR carbon steel
    F = 304 SS
    G = high grade steel

    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 T220 plain bearings are resistant to highly diluted alkalis and very weak acids.

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

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

    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 T220 plain bearings is around 0.3% in a normal climate. The saturation limit in water is 0.5%. These values are so low that consideration of swelling due to moisture absorption is only necessary in extreme cases.

    Maximum moisture absorption (at +23°C/50% room humidity.):

    0.3% weight

    Maximum total moisture absorption:

    0.5% weight

    Installation tolerances

    iglidur T220 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 Q290 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 up to 180+0.000 +0.040+0.085 +0.245-0.100 +0.000

    Thermal conductivity

    [W/m · K] 0.24

    ASTM C 177

    Coefficient of thermal expansion

    (at +23°C) [K-1 · 10-5] 11

    DIN 53752

    Compressive strength

    55MPa

    Vacuum

    Any moisture present will degas in a vacuum. Use in a vacuum is only possible for dry bearings made of iglidur T220.

    Radioactive radiation

    Plain bearings made of iglidur T220 are resistant to radiation up to a radiation intensity of 3 · 10²Gy.

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