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iglidur® H1 - Material data

Materials table

General features Unit iglidur® H1 test method
Density g/cm³ 1,53
Colour cream-white
Max. humidity absorption at 23°C/50% R. H. % weight 0,1 DIN 53495
Max. water absorption % weight 0,3
Coefficient of surface friction, dynamic, against steel µ 0,06 - 0,20
PV values max. (dry) MPa x m/s 0,8

Mechanical properties
Bending E-module MPa 2800 DIN 53457
Tensile strength at +20 °C MPa 55 DIN 53452
compressive strength MPa 78
Maximum recommended surface pressure (20° C) MPa 80
Shore D hardness 77 DIN 53505

Physical and thermal properties
Max. long term application temperature °C +200
Max. short term application temperature °C +240
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] 6 DIN 53752

Electrical properties
Specific forward resistance Ωcm > 1012 DIN IEC 93
Surface resistance Ω > 1011 DIN 53482
'Table 01: Material Data


Figure 01: Permitted pv-values for iglidur® H1 bearings
 

Figure 01: Permitted PV values for iglidur® H1 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® H1 plain bearings have been specially developed for use under extreme environmental conditions. Their strengths are the extremely high wear resistance and the excellent coefficients of friction even in applications in which the bearing is exposed to extreme temperatures and/or aggressive chemicals. iglidur® H1 bearings can be used completely free of lubrication; in wet area applications, the surrounding medium acts as additional lubricant.


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

Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it. With increasing temperatures, the compressive strength of iglidur® H1 bearings decreases. Fig. 02 clarifies this connection.
 
Figure 03 shows the elastic deformation of iglidur® H1 with radial loads. Among the iglidur® H materials, iglidur® H1 material has the greatest elasticity. This needs to be taken into account in applications with high surface pressures or edge loads.


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

Table 02: Maximum surface speeds

Permitted surface speeds

Due to the excellent coefficients of friction, rotating surface speeds up to 2 m/s are possible with iglidur® H1 plain bearings in dry operation. Linear speeds up to 5 m/s are attained. The speeds stated in Table 02 are limit values for the lowest bearing loads. With higher loads, the permitted speed drops with the extent of the load due to the limitations by the PV value.


iglidur® H1 Operating temperature
Lower - 40 °C
Upper, long-term + 200 °C
Upper, short-term + 240 °C
Secure axially in addition + 80 °C
Table 03: Temperature limits for iglidur® H1

Temperatures

iglidur® H1 is a very temperature-resistant material. The temperatures prevailing in the bearing system also have an influence on the bearing wear. The wear rises with increasing temperatures. In iglidur® H1 in particular, this increase however is very low. An additional securing is recommended at temperatures higher than +80°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 loadand surface speed (Fig. 04 and 05).

iglidur® H1 Dry Grease Oil Water
Coefficients of friction µ 0,06 - 0,2 0,09 0,04 0,04

Table 04: Coefficients of friction for iglidur® H1 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

Figures 06 and 07 display a summary of the test results with different shaft materials conducted with iglidur® H1 plain bearings at the igus® laboratory.
 
The iglidur® H1 plain bearings display excellent wear behavior in combination with a wide variety of shaft materials both in rotating and pivoting operations. On the V2A shafts in particular, iglidur® H1 attains very low wear rates both in rotating and pivoting operations. Even on hard-coated aluminum shafts, iglidur® H1 plain bearings attain high service life in rotating applications with low to medium loads.

Fig. 07 Wear in oscillating and rotating Fig. 07 Wear with oscillating and rotating applications with Cf53 according to the load
 
Y = wear [μm/km]
 
A= Cf53
B= hard chrome-plated
C= V2A
D= St37
 
pink= oscillating
blue= rotaring

Medium Resistance
Alcohols +
Hydrocarbons +
Greases, oils without additives +
Fuels +
Diluted acids + to 0
Strong acids + to -
Diluted bases +
Strong bases + to -
+ resistant      0 limited resistance      - not resistant
All specifications at room temperature[20 °C]
Table 05: Chemical resistance of the iglidur® bearings H1


Electrical properties

Specific forward resistance > 1012 Ωcm
Surface resistance > 1011 Ω
iglidur® H1 bearings are electrically insulating.

chemical resistance

iglidur® H1 bearings have a good resistance against chemicals. Hence even chemicals can act as lubricants. The iglidur® H1 plain bearings are not resistant against hot, oxidizing acids and some other particularly aggressive chemicals.

Radioactive rays

They are resistant up to a radiation intensity of 2 x 102 Gy.

UV-resistant

igubal® H1 bearings are only conditionally resistant to UV rays. The surface of iglidur® H1 becomes coarser under the influence of atmospheric conditions and the wear increases. Therefore the use of iglidur® H1 plain bearings in applications directly exposed to weathering should be tested in individual cases.

Vacuum

Note that during use in vacuum, even minor water elements outgas. The use in vacuum is basically possible.


Maximum moisture absorption
by +23 °C/50 % r. F. 0,1 weight-%
Max. water absorption 0,3 weight-%

Table 06: The moisture absorption of iglidur® H1 bearings

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 moisture absorption of iglidur® H1 bearings is about 0.1 Wt.-% in standard climatic conditions. The saturation limit in water is 0.3 Wt.-%. Therefore iglidur® H1 is very well suited for use in wet environments.


Diameter
d1 [mm]
Shaft
h9 [mm]
iglidur® H1
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® H1 bearings are press-in bushings 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 )