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iglidur® G - Material data

Materials table

General features Unit iglidur® G test method
Density g/cm³ 1,46
Colour Matt-grey
Max. humidity absorption at 23°C/50% R. H. % weight 0,7 DIN 53495
Max. water absorption % weight 4,0
Coefficient of surface friction, dynamic, against steel µ 0,08 - 0,15
PV values max. (dry) MPa x m/s 0,42

Mechanical properties
Bending E-module MPa 7.800 DIN 53457
Tensile strength at +20 °C MPa 210 DIN 53452
compressive strength MPa 78
Maximum recommended surface pressure (20° C) MPa 80
Shore D hardness 81 DIN 53505

Physical and thermal properties
Max. long term application temperature °C +130
Max. short term application temperature °C +220
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] 9 DIN 53752

Electrical properties
Specific forward resistance Ωcm > 1013 DIN IEC 93
Surface resistance Ω > 1011 DIN 53482
Figure 01: Permitted pv-values for iglidur®{SBA} bearings with 1 mm wall thickness in dry operation against a steel shaft, at +20°C, installed in a steel housing.



 

Figure 01: Permitted pv-values for iglidur®{SBA} 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]
 

iglidur® G is the decathlete among iglidur® materials. It performs exceedingly well in all technical disciplines and is the classic all-rounder, primarily with respect to the overall general, mechanical, thermal and tribological properties.


Figure 02: Maximum recommended surface pressure dependent on the temperature (80 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

With increasing temperatures, the compressive strength of iglidur® G bearings decreases. Fig. 02 clarifies this connection. With the long-term permitted application temperature of +130°C, the permitted surface pressure still amounts to 35 MPa. Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it.


 

 

 

 
The Fig. 03 shows the elastic deformation of iglidur® G with radial loads. A plastic deformation can be negligent up to a pressure of about 100 MPa. It is however also dependent on the period of exposure.


Maximum surface speed

m/s Rotary oscillating Linear
Constant 1 0,7 4
Short-term 2 1,4 5

Table 02: Maximum surface speeds

Permitted surface speeds

iglidur® G has been developed for low to medium surface speeds. The maximum values stated in the Table 02 can be attained only with minor pressure loads. At the specified speeds, an increase in temperature up to the long-term permitted value can occur due to friction. In practice these limit values are not always reached due to interactions.


iglidur® G Operating temperature
Lower - 40 °C
Upper, long-term + 130 °C
Upper, short-term + 220 °C
Secure axially in addition + 80 °C

Table 03: Temperature limits

Temperatures

The ambient temperatures influence the properties of bearings to a high degree. The temperatures prevailing in the bearing system also have an influence on the bearing wear. The wear increases with rising temperatures, and the influence is especially marked from 120°C temperature onwards. An additional securing is recommended at temperatures higher than +80°C.


iglidur® G Dry Grease Oil Water
Coefficients of friction µ 0,08 - 0,15 0,09 0,04 0,04

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

Friction and wear

Just like the wear resistance, the coefficient of friction µ also alters with the load (Fig. 04 and 05).

graph Figure 04: Coefficients of friction dependent on the surface speed, p = 0.75 MPa

X = Surface speed [m/s]
Y = Coefficient of friction μ
graph Figure 05: Coefficients of friction dependent on the load, v = 0.01 m/s

X = Load [MPa]
Y = Coefficient of friction μ

Wear, rotating application with various Fig. 06: Wear, rotating application with different shaft materials, load p = 0.75 MPa, v = 0.5 m/s
 
X = Shaft material
Y = Wear [μm/km]
 
A = Aluminum, hard-anodized
B = machining steel
C = Cf53
D = Cf53, hard-chromed
E = St37
F = V2A
G = X90

Shaft materials

Friction and wear also depend to a high degree on the reverse partner. Very smooth shafts increase the coefficient of both friction and wear. A smoothed surface with an average surface finish Ra = 0.8 µm is best suited for iglidur® G. Figure 06 displays a summary of the results of tests with different shaft materials, which were conducted with iglidur® G plain bearings. In this connection it is important to note that with increasing loads, the recommended hardness of the shaft increases. The "soft" shafts tend rather to wear themselves and thus increase the wear of the entire system. When the load exceeds 2 MPa, it should be noted that the wear rate (the slope of the curve) tends to decrease with the hardness of the shaft material. Please contact us in case the shaft material scheduled by you is not included here.

Wear in oscillating and rotating applications Fig. 07: Wear at rotating or oscillating motions with CF53 shaft material dependent on the load
 
X = Load [MPa]
Y = Wear [μm/km]
 
A = rotating
B = 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 iglidur®



Electrical properties

Specific forward resistance > 1013 Ωcm
Surface resistance > 1011 Ω

Further properties


Chemical resistanceiglidur® G bearings have a good resistance against chemicals at room temperature. They are resistant to most lubricants. iglidur® G is not affected by most weak organic and inorganic acids.
 

Radioactive raysiglidur® G bearings are radiation resistant up to a radioactive intensity of 3 • 102 Gy.
 

UV-resistantiglidur® G bearings are permanently resistant against UV rays.
 

VacuumIn vacuum, iglidur® G degases. The application in vacuum is possible only for dry bearings.
 

Electrical propertiesiglidur® G bearings are electrically insulating.


Maximum moisture absorption

by +23 °C/50 % r. F. 0.7 Wt.-%
Max. water absorption 4,0 Wt.-%

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 [%]

humidity absorption / moisture absorption

The humidity absorption of iglidur® G bearings amounts to about 0,7% in standard climatic conditions. The saturation limit in water is 4 %. This should be considered according to application conditions.


Diameter
d1 [mm]
Shaft
h9 [mm]
iglidur® G
E10 [mm]
Housing H7
[mm]
Up to 3 0 - 0,025 +0,014 +0,054 0 +0,010
> 3 to 6 0 - 0,030 +0,020 +0,068 0 +0,012
> 6 to 10 0 - 0,036 +0,025 +0,083 0 +0,015
> 10 to 18 0 - 0,043 +0,032 +0,102 0 +0,018
> 18 to 30 0 - 0,052 +0,040 +0,124 0 +0,021
> 30 to 50 0 - 0,062 +0,050 +0,150 0 +0,025
> 50 to 80 0 - 0,074 +0,060 +0,180 0 +0,030
> 80 to 120 0 - 0,087 +0,072 +0,212 0 +0,035
>120 to 180 0 - 0,100 +0,085 +0,245 0 +0,040

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

Installation tolerances

iglidur® G 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 E10 tolerance. In certain dimensions the tolerance in dependence on the wall thickness deviates from this (See delivery program )