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iglidur® F - Material data

Materials table

General features Unit iglidur® F test method
Density g/cm³ 1,25
Colour black
Max. humidity absorption at 23°C/50% R. H. % weight 1,8 DIN 53495
Max. water absorption % weight 8,4
Coefficient of surface friction, dynamic, against steel µ 0,1 - 0,39
PV values max. (dry) MPa x m/s 0,34

Mechanical properties
Bending E-module MPa 11.600 DIN 53457
Tensile strength at +20 °C MPa 260 DIN 53452
compressive strength MPa 98
Maximum recommended surface pressure (20° C) MPa 105
Shore D hardness 84 DIN 53505

Physical and thermal properties
Max. long term application temperature °C +140
Max. short term application temperature °C +180
Lower application temperature °C -40
Heat conductivity [W/m x K] 0,65 ASTM C 177
Coefficient of thermal expansion (at 23° C) [K-1 x 10-5] 12 DIN 53752

Electrical properties
Specific forward resistance Ωcm < 103 DIN IEC 93
Surface resistance Ω < 102 DIN 53482
'Table 01: Material Data




Figure 01: Permitted PV values for iglidur® F 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]

 
When bearings need to be electrically conductive, especially in applications that should keep out static, the iglidur® F is the right choice. Moreover, the iglidur® F bearings are extremely pressure resistant. At room temperature, they could be statically loaded up to 100 MPa.

Figure 02: Maximum recommended surface pressure dependent on the temperature (105 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® F plain bearings declines with increasing temperatures. Fig. 02 clarifies this connection. With the long-term permitted application temperature of +140°C, the permitted surface pressure still amounts to 50 MPa.
 
Diagram 03 shows the elastic deformation of iglidur® F during radial loading. Under the maximum recommended surface pressure of 105 MPa, the deformation amounts to less than 3,0%. A plastic deformation can be negligible up to this pressure load. It is however also dependent on the period of exposure.

Maximum surface speed

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

Permitted surface speeds

The maximum permitted surface speeds are based on the operation period and the type of motion. A bearing is the most stressed in long-term rotating motions. Here the maximum speed for the iglidur® F bearing is 0.8 m/s. The maximum values specified in Table 02 are attained only at minimum pressure loads. In practice these limit values are not often attained due to interactions.

iglidur® F Application temperature
Lower - 40 °C
Upper, long-term + 140 °C
Upper, short-term + 180 °C
Secure axially in addition + 105 °C
Table 03: Temperature limits for iglidur® F

Temperatures

The ambient temperatures strongly influence the properties of bearings. The pressure resistance of iglidur® F bearings declines with increasing temperatures. The wear also increases. Additional safety is required at temperatures over +105°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 coefficients of friction in the dry operation are not so favorable in iglidur® F bearings like in many other iglidur® materials. However iglidur® bearings can be lubricated without any problems, and iglidur® F bearings attain excellent results compared among the lubricated iglidur® bearings.
iglidur® F dry Grease Oil Water
Coefficients of friction µ 0,1 - 0,39 0,09 0,04 0,04

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

Wear, rotating application with various shaft materials Fig. 06: Wear, rotating application with various 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 show an excerpt of the results of tests with different shaft materials conducted with bearings made of iglidur® F. In the lowest load range, the hard-chromed shafts prove to be the most suitable counter partner in rotating applications with iglidur® F bearings.
Wear in oscillating and rotating Fig. 07: Wear in oscillating and rotating applications with various shaft materials, p = 2 MPa
 
Y = wear [μm/km]
 
A= Cf53
B= hard chrome-plated
C= V2A
D= St37
 
blue= rotating
pink= oscillating

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


Electrical properties

Specific forward resistance < 103 Ωcm
Surface resistance < 102 Ω

Chemical resistance

iglidur® F bearings have a good resistance against chemicals. The particularly high resistance to lubricants is to be highlighted, even at high temperatures (around +120°C). Hence the iglidur® F bearings are particularly suitable for applications that call for lubrication necessitated by other parts. The iglidur® F is not affected by most weak organic and inorganic acids.

Radioactive rays

iglidur® F bearings are radiation resistant up to a radiation intensity of 3 x 102 Gy.

UV-resistant

iglidur® F bearings are permanently resistant against UV rays.

Vacuum

In application in vacuum, the potentially existent moisture content is degassed. For this reason only the dry iglidur® F bearings are suitable for vacuum.

Electrical properties

iglidur® F bearings are electrically conductive..

Maximum moisture absorption
by +23 °C/50 % r. F. 1,8 weight-%
Max. water absorption 8,4 weight-%
Table 06: Moisture absorption of iglidur® F
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® 200 bearings amounts to about 1,8% in standard climatic conditions. The saturation limit in water is 8,4 %. This should be considered according to application conditions.

Diameter
d1 [mm]
Shaft h9
[mm]
iglidur® F
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
> 50 to 80 0 - 0,074 +0,100 +0,290 0 +0,030

Table 07: Important tolerances for iglidur® F bearings according to ISO 3547-1 after the press-fit.

Installation tolerances

iglidur® F 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 D11 tolerance. On certain dimensions, the tolerance varies from this as a function of the wall-thickness (see product range).


The terms "igus", "Apiro", "chainflex", "CFRIP", "conprotect", "CTD", "drylin", "dry-tech", "dryspin", "easy chain", "e-chain", "e-chain systems", "e-ketten", "e-kettensysteme", "e-skin", "e-spool", "flizz", "ibow", "igear", "iglidur", "igubal", "igutex", "kineKIT", "manus", "motion plastics", "pikchain", "readychain", "readycable", "ReBeL", "speedigus", "triflex", "robolink", "xirodur", and "xiros" are legally protected trademarks of the igus® GmbH/ Cologne in the Federal Republic of Germany and where applicable in some foreign countries.

igus® GmbH points out that it does not sell any products of the companies Allen Bradley, B&R, Baumüller, Beckhoff, Lahr, Control Techniques, Danaher Motion, ELAU, FAGOR, FANUC, Festo, Heidenhain, Jetter, Lenze, LinMot, LTi DRiVES, Mitsubishi, NUM,Parker, Bosch Rexroth, SEW, Siemens, Stöber and all other drive manufacturers mention on this website. The products offered by igus® are those of igus® GmbH