iglidur® C - Material data

Materials table

Genera l features	Unit	iglidur® C	test method
Density	g/cm³	1,1
Colour		Whitish
Max. humidity absorption at 23°C/50% R. H.	% weight	1,0	DIN 53495
Max. water absorption	% weight	6,9
Coefficient of surface friction, dynamic, against steel	μ	0,17-0,25
pv value, max. (dry)	MPa x m/s	0,10
Mechanical properties
Bending E-module	MPa	1.900	DIN 53457
Bending strength (20°C)	MPa	60	DIN 53452
compressive strength	MPa	30
Maximum recommended surface pressure (20° C)	MPa	40
Shore D-hardness		72	DIN 53505
Physical and thermal properties
Max. long term application temperature	°C	+90
Max. short term application temperature	°C	+130
Minimum application temperature	°C	-40
thermal / heat conductivity	W/m x K	0,24	ASTM C 177
Coefficient of thermal expansion (at 23° C)	K^–1 x 10^–5	15	DIN 53752
Electrical properties
Specific forward resistance	Ωcm	> 10¹⁰	DIN IEC 93
surface resistance	Ω	> 10⁹	DIN 53482

'Table 01: Material Data

Bearings made of iglidur® C were developed especially for applications where the use of PTFE and silicon is not possible. Such applications can be found in electronics, tobacco and beverages industry and in many painting processes. Keywords like paint compatibility and silicon-free make the employment of this material reasonable.

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 [m/s]

Mechanical properties

The pressure resistance of iglidur® C bearings declines with increasing temperatures. Fig. 02 highlights this correlation. The maximum recommended surface pressure is a mechanical material parameter. Tribological conclusions cannot be drawn from it.

Figure 03 shows the elastic deformation of iglidur® C with radial loads. The high flexibility makes the bearing suitable for vibrations and edge loads.

Maximum surface speed

m/s	Rotating	Oscillating	Linear
Constant	1	0,7	2
Short-term	1,5	1,1	3

Permitted surface speeds

Though important solid lubricants have been deliberately dispensed with in the development of the iglidur® C, the bearings are very wear resistant and for this reason suitable also for continuous movements at medium surface speeds. Though speeds up to 1.5 m/s are attained on the short term, the main applications should however be undertaken with speeds below 0.5 m/s.

Surface speed

p x v value and lubrication

Figure 23.3: Maximum recommended surface pressure dependent on the temperature

Temperatures

The upper short-term application temperature is +130°C. However no more loads are possible at this temperature. Therefore it would be reasonable to limit the temperature to about 80 up to 90° C. Note that the bearing should be mechanically fastened to the housing from temperatures of +40° C to counteract the danger of loosening of the bearing.

Temperatures, coefficient of thermal expansion

Figure 2.4: Coefficients of friction dependent on the surface speed, p = 0.75 MPa

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 of the iglidur® C bearing is dependent to a large degree on the coarseness of the shaft. Similarly the wear of the bearing is very good in applications with rotating or pivoting motions with low loads.

Coefficients of friction for iglidur® C against steel
(Ra = 1 µm, 50 HRC)

iglidur® C	Dry	Grease	Oil	Water
Coefficients of friction µ	0,17 - 0,25	0,09	0,04	0,04

Coefficients of friction

Wear resistance

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

Figure 06 clearly shows how important the "suitable" counter partner can be. Although all the results shown from these rotation experiments can be regarded as very good, the difference is sometimes significant. This difference becomes even greater as the load increases.

Shaft materials

Figure 07: Wear in pivoting and rotating applications with Cf53 dependent on the load

X = Load [MPa]
Y = Wear [μm/km]

A = Rotating
B = Pivoting

Figure 23.9: Wear with pivoting and rotating applications with Cf53 shaft material, dependent on the load

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 C

Electrical properties

Specific forward resistance	> 10¹⁰ Ωcm
Surface resistance	> 10⁹ Ω

Chemical resistance

iglidur® C bearings are resistant to cleaning agents, fats, oils, diluted alkalis and weak acids.

The humidity absorption of iglidur® C bearings amounts to about 7% with saturation in water and therefore this should be accounted for in applications in humid environment.

Radioactive rays

iglidur® C bearings are resistant up to a radioactive intensity of 2 x 10⁴ Gy. Higher radiations affect the material and can lead to the loss of important mechanical properties.

UV-resistant

iglidur® C bearings are not resistant against UV rays. In outdoor applications or in other applications with intensive radiation, adequate protection against direct radiation should be provided.

Vacuum

The iglidur® C bearings can be used in vacuum only restrictedly. Potentially existent humidity degasses.

Electrical properties

iglidur® C bearings are electrically insulating.

Maximum moisture absorption
by +23 °C/50 % r. F.	1,0 weight-%
Max. water absorption	7,0 weight-%

Table 06: Moisture absorption of iglidur® C

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® C bearings amounts to about 7% with saturation in water and therefore this should be accounted for in applications in a humid environment.

Important tolerances for iglidur® C bearings according to ISO 3547-1 after the press-fit.

Diameter d1 [mm]	Shaft h9 [mm]	iglidur® C 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® C bearings according to ISO 3547-1 after the press-fit.

Installation tolerances

iglidur® C plain bearings are standard bearings for shafts with tolerance h (minimum recommendation is 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.

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iglidur® C - Material data

Materials table

Mechanical properties

Maximum surface speed

Permitted surface speeds

Temperatures

Friction and wear

Coefficients of friction for iglidur® C against steel(Ra = 1 µm, 50 HRC)

Shaft materials

Electrical properties

Chemical resistance

Radioactive rays

UV-resistant

Vacuum

Electrical properties

humidity absorption / moisture absorption

Important tolerances for iglidur® C bearings according to ISO 3547-1 after the press-fit.

Installation tolerances

Ülke/Bölge

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Coefficients of friction for iglidur® C against steel
(Ra = 1 µm, 50 HRC)