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iglidur® A181 - material data

Table of contents

The most important specifications at a glance

Due to their technical specifications and their conformity with the relevant regulations, iglidur A181 plain bearings are predestined for applications in food technology. Compared to iglidur A180 with regard to the mechanical properties, temperature and media resistance, iglidur A181 is more suitable with respect to the wear resistance in most cases.

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 0.10 - 0.21
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?

  • When FDA conformity is required
  • When a material compliant with Regulation (EU) No. 10/2011 is required
  • When a universal material for direct contact with food is required

When do I use a different material?

  • If conformity with Regulation (EU) No. 10/2011 and the FDA is not required -> iglidur J
  • When temperatures permanently exceed +90°C -> iglidur A350
  • If a cost-effective universal plain bearing is required -> iglidur G, iglidur P

Temperatures

The upper long-term application temperature of +90°C enables a wide range of applications in the food sector. The compressive strength decreases with increasing temperatures. When considering temperatures, the additional frictional heat in the bearing system must be taken into account. An additional safety device is recommended for temperatures higher than +60°C.

Further information on temperatures

min. application temperatureUpper application temperature, long-termUpper application temperature, short-termIn addition secure axially from
-50°C+90°C+110°C+60°C

Permissible surface speeds

iglidur A181 has been developed for low surface speeds. In dry operation, a maximum of 0.8m/s (rotating) or 3.5m/s (linear) is permitted for continuous use. The values given in the table indicate the limits at which frictional heat causes an increase up to the permanently permissible temperature. In practice, these limit values cannot always be achieved due to interactions.

Surface speeds of various iglidur materials

Maximum surface speeds [m/s]RotatingOscillatinglinear
Long-term0.80.63.5
Short-term1.21.05.0

Permissible pv values

Diagram 01: Permitted pv values for iglidur A181 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

0.31

<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 compressive strength of iglidur A181 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 A181 under radial loads.

Diagram 02: Maximum recommended surface pressure as a function of temperature (31 MPa at +20°C)

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

Diagram 03: Deformation under pressure and temperatures

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

Friction and wear

Coefficient of friction and wear resistance change with the application parameters (diagrams 04 and 05). With iglidur A181 plain bearing, the change in the coefficient of friction μ as a function of surface speed and shaft roughness is only slightly pronounced.

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

iglidur A181dryGreasesOilWater
Coefficient of friction μ0.10 - 0.210.080.030.04

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

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 extension of the results of tests with different shaft materials that were carried out with iglidur A181 plain bearing. Particular attention is paid here to the corrosion-free shaft types for the food sector. Diagram 06 shows that low wear rates are achieved especially in combination with these shafts. As with many iglidur materials, the wear rate increases in rotation with otherwise identical parameters (diagram 07).

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 shaft material Cf53 as a function of

A = rotating
B = oscillating on the load

X= pressure [MPa]
Y= wear [μm/km]

Chemical resistance

iglidur A181 plain bearings can be used under a wide range of environmental conditions and in contact with numerous chemicals. The table provides an overview of the chemical resistance of iglidur A181 plain bearings at room temperature.

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

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

Moisture absorption

Total moisture absorption for iglidur A181

Diagram 08: Influence of moisture absorption

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

The iglidur A181 plain bearings absorb up to 0.2% of water due to humidity (+23°C, 50% relative humidity) and up to 1.3% when saturated with water.

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

0.2% weight

Maximum total moisture absorption:

1.3% weight

Installation tolerances

iglidur A181 plain bearings are standard bearings for shafts with h-tolerance (recommended at least h9). The bearings are designed for the press-fit in a housing with H7 tolerance. After installation in a housing with nominal dimensions, the inner diameter of the bearings with E10 tolerance is set independently.

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

Diameter d1 [mm]Housing H7 [mm]iglidur A181 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] 0.25

ASTM C 177

Coefficient of thermal expansion

(at +23°C) [K-1 · 10-5] 11

DIN 53752

Compressive strength

60MPa

Vacuum

Any moisture present will degas in a vacuum. Use in a vacuum is only possible for dry bearings made of iglidur A181.

Radioactive radiation

Plain bearings made of iglidur A181 are resistant to radiation up to a radiation intensity of 2 · 10² Gy.

Typical application areas

Food industry

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Beverage technology

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Medical technology

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