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

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

DIN 53452

Compressive strength

MPa

maximum recommended surface pressure (20°C)

MPa

Shore D hardness

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

DIN 53752

Electrical specification

Volume resistivity

Ωcm

> 1010

DIN IEC 93

surface resistance

> 109

DIN 53482

Table 01: Material data

Download data sheet

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.

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 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

0,7

short-term

1,5

1,1

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.

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.

iglidur® C

dry

Fat

oil

water

coefficient of friction µ

0,17 - 0,25

0,09

0,04

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

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

Medium

Resistance

Alcohols

+ to 0

Hydrocarbons

Greases, oils, not additivated

fuels

Diluted acids

0 to -

strong acids

Dilute bases

strong bases

+ 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.

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.