iglidur® A180 - Material data

Figure 02: Maximum recommended surface pressure dependent on the temperature (20 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® A180 bearings decreases. Fig. 02 clarifies this connection.
 
Figure 03 shows the elastic deformation of iglidur® A180 with radial loads. Under the maximum recommended surface pressure of 20 MPa, the deformation amounts to less than 2.5%. A plastic deformation is negligible up to this radial load. It is however also dependent on the period of exposure.

m/s	Rotary	oscillating	Linear
Constant	0,8	0,6	3,5
Short-term	1,2	1	5

Table 02: Maximum surface speeds

Permitted surface speeds

iglidur® A180 is developed for low surface speeds. Maximum speeds up to 0.8 m/s (rotating) and 3.5 m/s (linear) respectively are permitted for continuous application in dry operation. The values specified in Table 02 state the limits to which the long-term permitted temperature rises due to friction heat. In practice these limit values are not always reached due to interactions.

iglidur® A180	Operating temperature
Lower	- 50 °C
Upper, long-term	+ 90 °C
Upper, short-term	+ 110 °C
Secure axially in addition	+ 60 °C

Table 03: Temperature limits for iglidur® A180

Temperatures

The upper short-term application temperature is +110℃. With increasing temperatures, the compressive strength of iglidur® A180 bearings decreases. Fig. 02 clarifies this connection. The temperatures prevailing in the bearing system also have an influence on the bearing wear. An additional securing is recommended at temperatures higher than +60°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

Coefficient of friction and wear resistance alter with the application parameters. With increasing load, the coefficient of friction however sinks markedly (Fig. 04 and 05).

iglidur® A180	Dry	Grease	Oil	Water
Coefficients of friction µ	0,05 - 0,23	0,09	0,04	0,04

Table 04: Coefficients of friction for iglidur® A180 against steel (Ra = 1 µm, 50 HRC)

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 Fig. 06 displays the results of tests with different shaft materials conducted with plain bearings made of iglidur® A180. The combination "iglidur® A180/hard anodized aluminum" clearly stands out. It attains good to excellent wear rates also with other shafts. With Cf53 shafts, the higher wear in swivelling applications is exemplary compared to rotating applications (Fig. 07).

Medium	Resistance
Alcohols	+
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 iglidur® A180

Electrical properties

Specific forward resistance	> 1012 Ωcm
Surface resistance	> 1011 Ω

iglidur® A180 bearings are electrically insulating.

Chemical resistance

iglidur® A180 bearings can be used under various environmental conditions and in contact with numerous chemicals. Table 05 gives an overview of the chemical resistance of iglidur® A180 bearings at room temperature.

Radioactive rays

iglidur® A180 bearings are radiation resistant up to a radioactive intensity of 3 x 10² Gy. Higher radiations affect the material and can lead to the loss of important mechanical properties.

UV-resistant

iglidur® A180 bearings are resistant to UV radiation, but the tribological properties deteriorate with continuous exposure.

Vacuum

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

Maximum moisture absorption
by +23 °C/50 % r. F.	0,2 weight-%
Max. water absorption	1,3 weight-%

Table 06: Humidity absorption of iglidur® A180

Diagram 10: Effect of moisture absorption
 
X = Moisture absorption [weight %]
Y = Reduction of inside diameter [%]

humidity absorption / moisture absorption

The iglidur® A180 bearings absorb up to 0.2% water through atmospheric humidity (+23°C, 50% relative atmospheric humidity), when saturated with water they absorb 1.3%.

Diameter d1 [mm]	Shaft h9 [mm]	iglidur® A180 F10 [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

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

Installation tolerances

iglidur® A180 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.