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iglidur® C500 - Material data

Material table

Genera l features Unit iglidur® C500 test method
Density g/cm³ 1,37
Colour Magenta
Max. humidity absorption at 23°C/50% R. H. % weight 0,3 DIN 53495
Max. water absorption % weight 0,5
Coefficient of surface friction, dynamic, against steel µ 0,07 - 0,19
pv values (dry) MPa x m/s 0,7

Mechanical properties
Bending E-module MPa 3000 DIN 53457
Tensile strength at +20 °C MPa 100 DIN 53452
compressive strength MPa 110
Maximum recommended surface pressure (20° C) MPa 110
Shore D-hardness 81 DIN 53505

Physical and thermal properties
Max. long term application temperature °C +250
Max. short term application temperature °C +300
Minimum application temperature °C -100
thermal / heat conductivity [W/m x K] 0,24 ASTM C 177
Coefficient of thermal expansion (at 23° C) [K-1 x 10-5] 9 DIN 53752

Electrical properties
Specific forward resistance Ωcm >1014 DIN IEC 93
surface resistance Ω >1013 DIN 53482
'Table 01: Material Data



 

Figure 01: Permitted pv-values for iglidur® C500 bearings with 1 mm wall thickness in dry operation against a steel shaft, at +20°C, installed in a steel housing.
 
X = gliding speed [m/s]
Y = load [MPa]


 
iglidur® C500 is a member of the family of extremely media and temperature-resistant iglidur® materials X, X6 and A500. This material is characterised by improved wear resistance and increased design flexibility - for instance as a piston ring.


Figure 02: Maximum recommended surface pressure dependent on the temperature (110 MPa to +20 °C)
 
X = Temperature [°C]
Y = Load [MPa]
Figure 03: Deformation under load and temperatures
 
X = Load [MPa]
Y = Deformatio [%]

Mechanical properties

Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it. With increasing temperatures, the compressive strength of iglidur® C500 plain bearings decreases. Fig. 02 clarifies this connection.
 
Figure 03 shows how iglidur® C500 elastically deforms under radial load. Under the maximum recommended surface pressure of 110 MPa, the deformation at room temperature is below 4,5%.


m/s Rotary oscillating Linear
Constant 0,9 0,7 2,4
Short-term 1,1 1 2,8
Table 02: Maximum surface speeds

Permitted surface speeds

The maximum permissible surface speed is determined by the resulting frictional heat at the bearing point. The temperature should rise only up to a value that still ensures a reasonable bearing insert with regard to wear and dimensional accuracy.
 
The maximum values stated in Table 02 are valid only with minimum pressure loads and are often not attained in practice.


iglidur® C500 Application temperature
Lower - 100 °C
Upper, long-term + 250 °C
Upper, short-term + 300 °C
Secure axially in addition + 130 °C
Table 03: Temperature limits

Temperatures

The iglidur® C500 is one of the most temperature-resistant iglidur® materials. Like in all thermoplastics, the compressive strength of iglidur® C500 decreases with rising temperature. The temperatures prevailing in the bearing system also have an influence on the bearing wear. The wear rises with increasing temperatures. An additional securing is recommended at temperatures higher than +130°C.


Figure 04: Coefficients of friction dependent on the surface speed, p = 1 MPa
 
X = Sliding speed [m/s]
Y = Coefficient of friction μ
Figure 05: Coefficients of friction dependent on the load, v = 0,01 m/s
 
X = Load [MPa]
Y = Coefficient of friction μ

Friction and wear

The friction and wear values for iglidur® C500 are even more favourable than on the other high-temperature materials, iglidur® X and A500. The friction value increases moderately as the gliding speed increases. The friction value initially drops rapidly to less than 0.1 under loads of up to approx. 20 MPa, and then only marginally increases as loads continue to increase. Friction and wear also depend to a high degree on the reverse partner. Very smooth shafts increase the coefficient of both friction and wear. Ideally suited is a smoothed surface with an average surface finish of Ra = 0.6 to 0.8 µm.
 

iglidur® C500 Dry Grease Oil Water
Coefficients of friction µ 0,07 - 0,19 0,09 0,04 0,04

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


Fig. 06: Wear, rotating application with various Figure 06: Wear, rotating application with different shaft materials, p = 1 MPa, v = 0,3 m/s
 
X = Shaft material
Y = Wear [μm/km]
 
A = Aluminum, hard-anodized
B = machining steel
C = Cf53
D = Cf53, hard chrome-plated
E = St37
F = V2A
G = X90

shaft materials

The Fig. 06 displays the results of tests with different shaft materials conducted with plain bearings made of iglidur® C500.
 
In the example of a rotational motion with radial loads of 1 MPa and a speed of 0.3 m/s, it becomes clear that iglidur® C500 is very constant in wear for a wide variety of shaft types. In this case, only the pairing with machining steel stand out upwards, and remarkably the pairing with aluminium HC downwards. The wear in rotation is higher than in swivelling movements (Figure 07) particularly with increasing radial loads.

Fig. 07: Wear in oscillating and rotating applications with Cf53 Fig. 07: Wear with oscillating and rotating applications with Cf53 as a function of the load
 
X = Load [MPa]
Y = Wear [μm/km]
 
A = Rotating | B = Oscillating

Medium Resistance
Alcohols +
Hydrocarbons +
Greases, oils without additives +
Fuels +
Diluted acids +
Strong acids +
Diluted bases +
Strong bases +
+ resistant      0 limited resistance      - not resistant
All specifications at room temperature[+20 °C]
Table 05: resistant to chemicals


Electrical properties

Specific forward resistance > 1014 Ωcm
surface resistance > 1013 Ω
iglidur® C500 bearings are electrically insulating.

Chemical resistance

iglidur® C500 plain bearings have good resistance to chemicals. br>
Most organic and inorganic acids, as well as alkalis or lubricants do not attack iglidur® C500.

Radioactive rays

iglidur® C500 withstands both the neutron and gamma particle radiations without noticeable loss to its excellent mechanical properties. iglidur® C500 bearings are radiation resistant up to a radioactive intensity of 3 x 10² Gy.
 

UV-resistant

iglidur® C500 bearings are permanently resistant against UV rays.
 

Vacuum

Water elements are degassed in the vacuum. Due to the low water absorption, an application in the vacuum is however possible.
 


Maximum moisture absorption
by +23 °C/50 % r. F. 0,3 weight-%
Max. water absorption 0,5 weight-%
Table 06: Moisture absorption

Effect of moisture absorption on plain bearings Diagram 10: Effect of moisture absorption
 
X = Moisture absorption [weight %]
Y = Reduction of inside diameter [%]

Moisture absorption

The humidity absorption of iglidur® C500 bearings amounts to about 0.3 Wt.-% in standard climatic conditions. The saturation limit in water is likewise below 0.5%.


Diameter
d1 [mm]
Shaft
h9 [mm]
iglidur® C500
F10 [mm]
Housing H7
[mm]
Up 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 iaw. ISO 3547-1 after press-fitting.

Installation tolerances

iglidur® C500- bearings are standard bearings for shafts with h-tolerance (recommended minimum h9). The bearings are designed for press-fit in a housing with h7 tolerance. After the installation in a housing with nominal diameter, the inner diameter of the bearing automatically adjusts to the F10 tolerance.