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iglidur® V400 - Material data

Materials table

Genera l features Unit iglidur® V400 test method
Density g/cm³ 1,51
Colour white
Max. humidity absorption at 23°C/50% R. H. Wt.-% 0,1 DIN 53495
Max. water absorption Wt.-% 0,2
Coefficient of surface friction, dynamic, against steel μ 0,15-0,20
pv value, max. (dry) MPa x m/s 0,50

Mechanical properties
Bending E-module MPa 4.500 DIN 53457
Tensile strength at +20 °C MPa 95 DIN 53452
compressive strength MPa 47 DIN 53452
Maximum recommended surface pressure (20° C) MPa 45
Shore D-hardness 74 DIN 53505

Physical and thermal properties
Max. long term application temperature °C +200
Max. short term application temperature °C +240
Minimum application temperature °C -50
thermal / heat conductivity W/m x K 0,24 ASTM C 177
Coefficient of thermal expansion (at 23° C) K-1 x 10-5 3 DIN 53572

Electrical properties
Specific forward resistance Ωcm > 1012 DIN IEC 93
Surface resistance Ω > 1012 DIN 53482
1) Without additional load; no gliding movement; relaxation not excluded.
'Table 01: Material Data


Fig. 01: Permissible pv values for iglidur® V400 plain bearings


Figure 01: Permitted PV values for iglidur® V400 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® V400 plain bearings are not suitable for high pressures or static high loads. However they are characterized by a high wear resistance all the way up to the maximum recommended surface pressure.


Figure 02: Maximum recommended surface pressure dependent on the temperature (40 MPa to +20 °C)

X = Temperature [°C]
Y = Load [MPa]
Figure 03: Deformation under load and temperatures

X = Load [MPa]
Y = Deformation [%]

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® V400 plain bearings decreases. Fig. 02 clarifies this connection.
 

Moreover the limit of the permitted loads at +100°C is still very high with 20 MPa. The high elasticity is also shown in Fig. 03.


m/s Rotary oscillating Linear
Constant 0,9 0,6 2
Short-term 1,3 0,9 3
Table 02: Maximum surface speeds

Permitted surface speeds

iglidur® V400 also permits high surface speeds due to the high temperature resistance. The very favorable coefficients of the bearing enable maximum surface speeds up to 1.3 m/s Even higher are the permitted speeds for linear movement and 3 m/s can be attained on the short term.


iglidur® V400 Operating temperature
Lower - 50 °C
Upper, long-term + 200 °C
Upper, short-term + 240 °C
Secure axially in addition + 100 °C
Table 03: Temperature limits for iglidur® V400

Temperatures

The long-term permissible maximum application temperature is +200°C. An additional securing is required at temperatures above 100°C. The wear resistance of the bearing is however excellent and claims a top position among all iglidur® materials. The compressive strength of iglidur® V400 plain bearings decreases with increasing temperatures. This connection can be seen in Fig. 02.


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 stressing of the bearing (Fig. 04 and 05). Furthermore, the coefficients of friction of iglidur® V400 are very constant. No other iglidur® bearing material exhibits a lower variance of the coefficients of friction, even when the shaft material is changed.
 

iglidur® V400 Dry Grease Oil Water
Coefficients of friction µ 0,15 - 0,20 0,09 0,04 0,04

Table 04: Coefficients of friction for iglidur® V400 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 influence of the shaft material on the wear resistance is greater than with the friction. Here already at low loads (0.75 MPa) there could be significant variations, as Figure 06 shows. In wear, the iglidur® V400 bearings additionally show better values in rotating applications than in swivelling motion (Fig. 07).

Fig. 07: Wear in oscillating and rotating Fig. 07: Wear with oscillating and rotating applications with Cf53 as a function of the load
 
X = Load [MPa]
Y = Wear [μm/km]
 
A = Cf53, rotating
B = Cf53, 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 V400
 


Electrical properties

Specific forward resistance > 1012 Ωcm
Surface resistance > 1012 Ω
Table 06: Electrical properties of iglidur® V400

Chemical resistance

iglidur® V400 bearings have a good resistance against chemicals. They are resistant to cleaning agents, fats, oils, alcohol, solvents, diluted alkalis, as well as diluted acids.

Radioactive rays

iglidur® V400 bearings are resistant up to a radioactive intensity of 2 x 104 Gy. Higher radiation affects the mechanical properties.
 

UV-resistant

iglidur® V400 bearings are largely resistant to UV rays.

Vacuum

The iglidur® V400 bearings can be used in vacuum only restrictedly. A degassing takes place.

Electrical properties

iglidur® V400 bearings are electrically insulating.


Maximum moisture absorption
at +23 °C/50 % r.F. 0,1 weight-%
Max. water absorption 0,2 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 [%]

humidity absorption / moisture absorption

The humidity absorption of the iglidur® V400 bearings amounts to just 0,2% with saturation in water.


Diameter
d1 [mm]
Shaft
h9 [mm]
iglidur® V400
F10 [mm]
Housing H7
[mm]
Up to 3 0 - 0,025 +0,006 +0,046 0 +0,010
> 3 bis 6 0 - 0,030 +0,010 +0,058 0 +0,012
> 6 bis 10 0 - 0,036 +0,013 +0,071 0 +0,015
> 10 bis 18 0 - 0,043 +0,016 +0,086 0 +0,018
> 18 bis 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 bis 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® V400 plain 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. In certain dimensions the tolerance in dependence on the wall thickness deviates from this (See delivery program )