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iglidur® C - Material data

Material table

General specification

Unit

iglidur® C

Test method

density

g/cm³

1,1

Colour

whitish

max. Moisture absorption at 23°C/50% room humidity.

% by weight

1,0

DIN 53495

max. total moisture absorption

wt.-%

6,9

Sliding friction coefficient, dynamic, against steel

μ

0,17-0,25

pv value, max. (dry)

MPa x m/s

0,10

Mechanical specification

flexural modulus

MPa

1.900

DIN 53457

flexural strength (20°C)

MPa

60

DIN 53452

Compressive strength

MPa

30

maximum recommended surface pressure (20°C)

MPa

40

Shore D hardness

72

DIN 53505

Physical and thermal specification

Upper long-term application temperature

°C

+90

upper short-term application temperature

°C

+130

Lower application temperature

°C

-40

thermal conductivity

W/m x K

0,24

ASTM C 177

coefficient of thermal expansion (at 23°C)

K-1 x 10-5

15

DIN 53752

Electrical specification

Volume resistivity

Ωcm

> 1010

DIN IEC 93

surface resistance

Ω

> 109

DIN 53482

Table 01: Material data

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

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

Bearings made of iglidur® C were specially developed for applications in which the use of PTFE and silicone is not possible. Such applications are found in electrical engineering, the tobacco and luxury food industry as well as in some painting processes. Keywords such as paint compatibility and freedom from silicone make it worth taking a closer look at this material.

diagram. 02: maximum recommended surface pressure as a function of temperature (40 MPa at +20 °C)

X = temperature [°C]
Y = load [MPa]

Mechanical specification
The compressive strength of iglidur® C 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: Deformation under pressure and temperature

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

diagram. 03 shows the elastic deformation of iglidur® C under radial load. The high flexibility makes the bearing suitable for vibrations and edge loads.

m/s

rotating

oscillating

linear

continuous

1

0,7

2

short-term

1,5

1,1

3

Table 02: Maximum surface speed

Permissible sliding speeds
Although important solid lubricants were deliberately omitted in the development of iglidur® C, the plain bearings are very wear-resistant and are therefore also suitable for continuous movements with medium sliding speeds. short-term speeds of up to 1.5 m/s are possible, but the main applications are at speeds below 0.5 m/s.

iglidur® C

Application temperature

lower

- 40 °C

Upper, long-term

+ 90 °C

upper, short-term

+ 130 °C

additional axial protection from

+ 40 °C

Table 03: Temperature limits for iglidur® C

Temperatures
The upper short-term application temperature is +130 °C. However, the bearings can no longer be loaded at this temperature. It therefore makes sense to limit the temperature to around +80 to +90 °C. Please note that the bearing must be mechanically secured in the housing from temperatures of +40 °C to counteract the risk of the bearing coming loose.

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

Friction and wear
The coefficient of friction of iglidur® C bearings depends to a large extent on the surface finish of the shaft. The wear of the bearing is also very good in applications with rotating or swivelling movements at low loads.

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

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

iglidur® C

dry

Fat

oil

water

coefficient of friction µ

0,17 - 0,25

0,09

0,04

0,04

Table 04: coefficient of friction for iglidur® C against steel
(Ra = 1 µm, 50 HRC)

Wear information

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

X = Shaft material
Y = wear [μm/km]

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

Shaft materials
diagram. 06 clearly shows how important the "suitable" mating partner can be. Although all the results shown in these rotation tests can be regarded as very good, the difference is sometimes significant and increases with increasing loads.

Shaft materials
Wear information

diagram. 07: Wear in swivelling and rotating applications with Cf53 as a function of load

X = load [MPa]
Y = wear [μm/km]

A = rotating
B = swivelling

Medium

Resistance

Alcohols

+ to 0

Hydrocarbons

Greases, oils, not additivated

fuels

Diluted acids

0 to -

strong acids

-

Dilute bases

strong bases

0

+ resistant 0 conditionally resistant - not resistant
All data at room temperature [+20 °C]
Table 05: chemical resistance of iglidur® C

Chemical resistance
iglidur® C bearings are resistant to cleaning agents, greases, oils, diluted alkalis and weak acids.

**
Electrical specification

Volume resistivity

> 1010 Ωcm

surface resistance

> 109 Ω

Radioactive radiation
Bearings made from iglidur® C are resistant to a radiation intensity of up to 2 x 104 Gy. Higher radiation levels attack the material and can lead to the loss of important mechanical specifications.

Maximum moisture absorption

at +23 °C/50 % room humidity.

1.0 % by weight

max. total moisture absorption

7.0 % by weight

Table 06: Moisture absorption iglidur® C

Moisture absorption
The moisture absorption of iglidur® C bearings is approx. 7 % when saturated in water and must therefore be taken into account for applications in humid environments.

Influence of moisture absorption

diagram. 10: Influence of moisture absorption

X = Moisture absorption [Gew.-%]
Y = Reduction inside ø [%]

Diameter****d1 [mm]

shaft h9**[mm]**

iglidur® C****D11 [mm]

housing H7**[mm]**

to 3

0 - 0,025

+0,020 +0,080

0 +0,010

> 3 to 6

0 - 0,030

+0,030 +0,105

0 +0,012

> 6 to 10

0 - 0,036

+0,040 +0,130

0 +0,015

> 10 to 18

0 - 0,043

+0,050 +0,160

0 +0,018

> 18 to 30

0 - 0,052

+0,065 +0,195

0 +0,021

> 30 to 50

0 - 0,062

+0,080 +0,240

0 +0,025

> 50 to 80

0 - 0,074

+0,100 +0,290

0 +0,030

Table 07: Important tolerances for iglidur® C plain bearings according to ISO 3547-1 after press-fitting

Installation tolerances
iglidur® C bearings are standard bearings for shafts with tolerance (recommended at leasth9).

The bearings are designed for press-fitting into a H7-toleranced mount. After installation in a mounting with nominal dimension, the inner diameter of the bearing with D11 tolerance adjusts itself.

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