iglidur® A500 - Material data

Materials table

General features Unit iglidur® A500 test method
Density g/cm³ 1,28
Colour Brown
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 0,26-0,41
PV values max. (dry) Mpa x m/s 0,28

Mechanical properties
Bending E-module MPa 3.600 DIN 53457
Tensile strength at +20 °C MPa 140 DIN 53452
compressive strength MPa 118
Maximum recommended surface pressure (20° C) MPa 120
Shore D hardness 83 DIN 53505

Physical and thermal properties
Max. long term application temperature °C +250
Max. short term application temperature °C +300
Lower application temperature °C -100
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® A500 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® A500 can be used at high temperatures and are permitted for use in direct contact with foodstuffs (FDA compatible). They exhibit an exceptionally good chemical resistance and are suitable for heavy-duty use in machinery for the food industry. Though iglidur® A500 is an extremely tough material, it simultaneously possesses excellent compressive strength even at high temperatures.

Figure 02: Maximum recommended surface pressure dependent on the temperature (120 MPa to +20 °C)

X = Temperature [°C]
Y = Load [MPa]

 

Figure 03: Deformation under load and temperatures

X = Load [MPa]
Y = Deformation [m/s]

 
Mechanical properties

Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it. The pressure resistance of iglidur® A500 plain bearings declines with increasing temperatures. Fig. 02 clarifies this connection. With the long-term permitted application temperature of +250°C, the permitted surface pressure is less than 11 MPa.
 
Figure 02 shows the maximum recommended surface pressure of the bearing dependent on the temperature. The combination of high stability and high flexibility acts very positively during vibrations and edge loads. As the wear of the bearing rapidly escalates from pressures of 10 to 20 MPa, we recommend a particularly accurate testing of the application above these limits.

Maximum surface speed

m/s Rotary oscillating Linear
Constant 0,6 0,4 1
Short-term 1 0,7 2
Table 02: Maximum surface speeds

Permitted surface speeds

iglidur® A500 also permits high surface speeds due to the high temperature resistance. The coefficient of friction rises however by these high rotatary speeds leading to a higher heating up of the bearing. Tests show that bearings made of iglidur® A500 are more wear resistant in pivoting motions, and the permitted PV values are also higher in the pivoting application.

iglidur® A500 Operating temperature
Lower - 100 °C
Upper, long-term + 250 °C
Upper, short-term + 300 °C
Secure axially in addition + 130 °C
Table 03: Temperature limits for iglidur® A500

Temperatures

The short-term permitted maximum application temperature is +300°C. The pressure resistance of iglidur® A500 plain bearings declines with increasing temperatures. Fig. 02 clarifies this connection. The temperatures prevailing in the bearing system also have an influence on the bearing wear.

Figure 04: Coefficients of friction dependent on the surface speed, p = 0,75 MPa

X = Surface 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 coefficient of friction is dependent on the load that acts on the bearing. In iglidur® A500 bearings, the friction coefficient µ initially declines with increasing load.

Friction and wear also depend to a high degree on the parallel partner. Thus extremely smooth shafts enhance not only the coefficient of friction, but also the bearing wear. The most suited are smoothed surfaces with an average surface finish of Ra = 0,4 to 0,9 µm.

iglidur® A500 Dry Grease Oil Water
Coefficients of friction µ 0,26 - 0,41 0,09 0,04 0,04

Table 04: Coefficients of friction for iglidur® A500 against steel (Ra = 1 μm, 50 HRC)

Figure 06: Coefficients of friction dependent on the shaft surface (CF53 shaft)
 
X = Shaft surface finish RA [μm]
Y = Coefficient of friction μ]

 
Shaft materials

Figures 06 to 09 display a summary of the results of tests with different shaft materials conducted with bearings made of iglidur® A500. The combination "iglidur® A500/hard-chromed shaft" clearly stands out in rotating application. Up to about 2.0 MPa, the wear of this combination remains largely independent of load. In pivoting motions with CF53 shafts, the wear resistance is better than in rotations under equal load.
 

Figure 07: 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

 

Figure 08: Wear with various shaft materials in the rotating operation dependent on the load

X = Load [MPa]
Y = Wear [μm/km]

A = Cf53
B = V2A
C = St37
D = Hard chrome-plated

 

Fig. 09: Wear with oscillating and rotating applications with Cf53 as a function of the load
 
X = Load [MPa]
Y = Wear [μm/km]
 
A= rotary
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: Chemical resistance of the iglidur® bearings A500


Electrical properties

Specific forward resistance > 1014 Ωcm
Surface resistance > 1013 Ω

Chemical resistance

iglidur® A500 bearings have an excellent resistance to cleaning agents, fats, oils, alkalis and acids.
 

Radioactive rays

Bearings made of iglidur® A500 figure among the most radiation-resistant bearings in the iglidur® product range. The bearings are resistant up to a radioactive intensity of 2 x 105 Gy Higher radiations affect the material and can lead to the loss of important mechanical properties.

UV-resistant

iglidur® A500 bearings are largely resistant to UV rays.

Vacuum

The iglidur® A500 bearings can be used in vacuum only restrictedly.

Electrical properties

iglidur® A500 bearings are electrically insulating.

Figure 10: Influence of humidity absorption of iglidur® A500 bearings

X = Moisture absorption [Wt-%]
Y = Reduction inner-Ø [%]

 
humidity absorption / moisture absorption

The humidity absorption of the iglidur® A500 bearings amounts to just 0.5% with saturation in water.

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

Table 06: humidity absorption of iglidur® A500

Diameter
d1 [mm]
Shaft
h9 [mm]
iglidur® A500
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® A500 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.

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