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iglidur® A200 - Material data

Materials table

General features Unit iglidur® A200 test method
Density g/cm³ 1,14
Colour white
Max. humidity absorption at 23°C/50% R. H. % weight 1,5 DIN 53495
Max. water absorption % weight 7,6
Coefficient of surface friction, dynamic, against steel µ 0,10 - 0,40
PV values max. (dry) MPa x m/s 0,09

Mechanical properties
Bending E-module MPa 2.500 DIN 53457
Tensile strength at +20 °C MPa 116 DIN 53452
compressive strength MPa 54
Maximum recommended surface pressure (20° C) MPa 18
Shore D hardness 81 DIN 53505

Physical and thermal properties
Max. long term application temperature °C +80
Max. short term application temperature °C +170
Lower application temperature °C -40
Heat conductivity [W/m x K] 0,24 ASTM C 177
Coefficient of thermal expansion (at 23° C) [K-1 x 10-5] 10 DIN 53752

Electrical properties
Specific forward resistance Ωcm > 1013 DIN IEC 93
Surface resistance Ω > 1012 DIN 53482
'Table 01: Material Data





Figure 01: Permitted PV values for iglidur® A200 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® A200 are suitable for application in direct contact with foodstuffs. Hence they are the ideal solution for bearing positions in machines for the food industry, medical equipment manufacturing, for small equipment for households, etc. In addition the iglidur® A200 is characterized by its capacity to embed dirt and by its quiet operating behavior. The high abrasion resistance, the insensitivity to dirt and the ability to operate dry enable it to dispense with the otherwise complex casings for lubricated bearings.


Figure 02: Maximum recommended surface pressure dependent on the temperature (18 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. With increasing temperatures, the compressive strength of iglidur® A200 bearings decreases. Fig. 02 clarifies this connection.
 
Figure 03 shows the elastic deformation of iglidur® A200 with radial loads. Under the maximum recommended surface pressure of 18 MPa, the deformation amounts to less than 2%. A plastic deformation is negligible up to this radial load. It is however also dependent on the period of exposure.


m/s Rotary oscillating Linear
Constant 0,8 0,6 2
Short-term 1,5 1,1 3
Table 02: Maximum surface speeds

Permitted surface speeds

iglidur® A200 is developed for low surface speeds. Maximum speeds up to 0.8 m/s (rotating) and 2 m/s (linear) respectively are permitted for continuous application in dry operation. These specified values state the limits to which the long-term permitted temperature rises due to friction heat. In practice these limit values are not always reached due to interactions.


iglidur® A200 Operating temperature
Lower - 40 °C
Upper, long-term + 80 °C
Upper, short-term + 170 °C
Secure axially in addition + 50 °C
Table 03: Temperature limits for iglidur® A200

Temperatures

The short-term permitted maximum temperature is + 170°C. With increasing temperatures, the compressive strength of iglidur® A200 plain bearings decreases. Fig. 02 clarifies this connection. The temperatures prevailing in the bearing system also have an influence on the bearing wear. An additional securing is recommended at temperatures higher than +50°C.
 


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 alters like the wear resistance with increasing load (Fig. 04 and 05).

iglidur® A200 Dry Grease Oil Water
Coefficients of friction µ 0,1 - 0,4 0,09 0,04 0,04

Table 04: Coefficients of friction for iglidur® A200 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 materials
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 and 07 display the results of tests with different shaft materials conducted with plain bearings made of iglidur® A200. In swivelling applications below a load of p = 2 MPa, the wear of iglidur® A200 plain bearings is higher than in rotating applications with equal load. Here, the shaft made of St37 is the positive exception.

Fig. 07: Wear in oscillating and rotating Fig. 07: Wear of rotating and oscillating applications with different shaft materials
 
Y = wear [μm/km]
 
A= Cf53
B= ard chrome-plated
C= V2A
D= St37
 
blue= rotary
pink= oscillating

Medium Resistance
Alcohols + to 0
Hydrocarbons +
Greases, oils without additives +
Fuels +
Diluted acids 0 to -
Strong acids -
Diluted bases +
Strong bases 0
+ resistant      0 limited resistance      - not resistant
All specifications at room temperature[+20 °C]
Table 05: Chemical resistance of the iglidur® bearings A200


Electrical properties

Specific forward resistance > 1013 Ωcm
Surface resistance > 1012 Ω

Chemical resistance

iglidur® A200 bearings have a good resistance to cleaning agents, fats, oils, alkalis and weak acids.

Radioactive rays

iglidur® A200 bearings are radiation resistant up to a radioactive intensity of 1 x 104 Gy. Higher radiations affect the material and can lead to the loss of important mechanical properties.
 

UV-resistant

iglidur® A200 bearings are resistant to UV rays.

Vacuum

The iglidur® A200 bearings can be used in vacuum only restrictedly due to the high humidity absorption.

Electrical properties

iglidur® A200 bearings are electrically insulating.


Maximum moisture absorption
by +23 °C/50 % r. F. 1,5 weight-%
Max. water absorption 7,6 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 [%]

The humidity absorption of iglidur® 200 bearings amounts to about 1.5% in standard climatic conditions. The saturation limit in water is 7.6 %. This should be considered according to application conditions.


Diameter
d1 [mm]
Shaft
h9 [mm]
iglidur® A200
D11 [mm]
Housing H7
[mm]
Up 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

Table 07: Important tolerances iaw. ISO 3547-1 after press-fitting.

Installation tolerances

iglidur® A200 plain bearings are standard bearings for shafts with h-tolerance (recommended minimum s 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 D11 tolerance. In certain dimensions the tolerance in dependence on the wall thickness deviates from this (See delivery program )