iglidur® C500 - Material data

Material table

General specification

Unit

iglidur® C500

Test method

density

g/cm³

1,37

Colour

magenta

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

% by weight

0,3

DIN 53495

max. total moisture absorption

wt.-%

0,5

Sliding friction coefficient, dynamic, against steel

0,07 - 0,19

pv value, max. (dry)

MPa x m/s

0,7

Mechanical specification

flexural modulus

MPa

3000

DIN 53457

flexural strength at 20°C

MPa

100

DIN 53452

Compressive strength

MPa

110

maximum recommended surface pressure (20°C)

MPa

110

Shore D hardness

DIN 53505

Physical and thermal specification

Upper long-term application temperature

°C

+250

Upper short-term application temperature

°C

+300

Lower application temperature

°C

-100

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

>1014

DIN IEC 93

surface resistance

>1013

DIN 53482

Table 01: Material data

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iglidur® C500 joins the family of extremely media- and temperature-resistant iglidur® materials X, X6 and A500. Improved wear resistance and greater design freedom - e.g. as a guide ring - characterise this material.

Mechanical specification
The maximum recommended surface pressure represents a mechanical material parameter. Conclusions on the tribology cannot be drawn from it. The compressive strength ofiglidur® C500 bearings decreases with increasing temperatures. diagram. 02 illustrates this correlation.

diagram. 03 shows how iglidur® C500 deforms elastically under radial load. Under the maximum recommended surface pressure of 110 MPa, the deformation at room temperature is approx. 4.5 %.

m/s

rotating

oscillating

linear

continuous

0,9

0,7

2,4

short-term

1,1

2,8

Table 02: Maximum surface speed

Permissible sliding speeds
The maximum permissible surface speed depends on the frictional heat generated at the bearing point. The temperature should only rise to a value that still ensures a reasonable spherical insert bearing in terms of wear and dimensional accuracy.

The maximum values given in Table 02 only apply to very low pressure loads and are often not achieved in practice.

iglidur® C500

Application temperature

lower

- 100 °C

upper, long-term

+ 250 °C

upper, short-term

+ 300 °C

additional axial protection from

+ 130 °C

Table 03: Temperature limits

Temperatures
iglidur® C500 is one of the most temperature-resistant iglidur® materials. As with all thermoplastics, the compressive strength of iglidur® C500 decreases with increasing temperatures. The temperatures prevailing in the bearing system also have an influence on the bearing wear. The wear increases with rising temperatures. Additional protection is required at temperatures higher than +130 °C.

Friction and wear
The values for friction and wear are even more favourable for iglidur® C500 than for the other high-temperature materials iglidur® X and A500. The coefficient of friction increases moderately with the surface speed. With the load, the coefficient of friction initially drops significantly to below 0.1 up to 20 MPa; with higher loads only slightly.friction and wear are also highly dependent on the mating partner. Shafts that are too smooth increase both the coefficient of friction and the wear of the bearing.a ground surface with an average surface finish of Ra = 0.6 to 0.8 μm is best suited.

iglidur® C500

dry

Grease

oil

water

coefficient of friction µ

0,07 - 0,19

0,09

0,04

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

diagram. 06: Wear, rotating application with different

Shaft materials
Diagram 06 shows test results with different shaft materials that were carried out with plain bearings made from iglidur® C500.

Using the example of a rotational movement with radial loads of 1 MPa and a speed of 0.3 m/s, it is clear that iglidur® C500 is very consistent in terms of wear across a wide range of shaft types. In this case, only the pairing with free cutting steel stands out at the top and, remarkably, the pairing with aluminium hc at the bottom.the wear in rotation is higher than in swivel movements, especially with increasing radial loads (diagram 07).

Shaft materials

diagram. 07: Wear in oscillating and rotating applications with Cf53

Medium

Resistance

Alcohols

hydrocarbons

Greases, oils, not additivated

fuels

Diluted acids

strong acids

Diluted bases

strong bases

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

Chemical resistance
iglidur® C500 bearings have very good resistance to chemicals.br>
The vast majority of organic and inorganic acids attack iglidur® C500 just as little as alkalis or lubricants.

**
Electrical specification

Volume resistivity

> 1014 Ωcm

surface resistance

> 1013 Ω

iglidur® C500 plain bearings are electrically insulating.

Radioactive radiation
iglidur® C500 withstands both neutron and gamma particle radiation without any noticeable loss of its excellent mechanical specification. Bearings made from iglidur® C500 are radiation-resistant up to a radiation intensity of 3 x 10² Gy.

Maximum moisture absorption

at +23 °C/50 % room humidity.

0.3 % by weight

max. total moisture absorption

0.5 % by weight

Table 06: Moisture absorption

Moisture absorption
The moisture absorption of iglidur® C500 bearings is less than 0.3 % in a normal climate. The saturation limit in water is also below 0.5 %.

Diameter****d1 [mm]

shaft h9**[mm]**

iglidur® C500****F10 [mm]

housing H7**[mm]**

to 3

0 - 0,025

+0,006 +0,046

0 +0,010

> 3 to 6

0 - 0,030

+0,010 +0,058

0 +0,012

> 6 to 10

0 - 0,036

+0,013 +0,071

0 +0,015

> 10 to 18

0 - 0,043

+0,016 +0,086

0 +0,018

> 18 to 30

0 - 0,052

+0,020 +0,104

0 +0,021

> 30 to 50

0 - 0,062

+0,025 +0,125

0 +0,025

> 50 to 80

0 - 0,074

+0,030 +0,150

0 +0,030

Table 07: Important tolerances according to ISO 3547-1 after press-fitting

Installation tolerances
iglidur® C500 bearings are standard bearings for shafts with tolerance (recommended at least h9) The bearings are designed for press-fitting into aH7-tolerated mount. After installation in a mounting with nominal dimension, the inner diameter of the bearing with F10 tolerance adjusts itself.