iglidur® HSD350 – material data

Diagram 02: Recommended maximum surface pressure of a function of temperature (30 MPa at +20 °C)
 
X = Temperature [°C]
Y = Load [MPa]

Mechanical properties

With increasing temperatures, the compressive strength of iglidur® HSD350 plain bearings decreases. The diagram 02 shows this inverse relationship. The recommended maximum surface pressure is a mechanical material parameter. No conclusions regarding the tribological properties can be drawn from this.

Diagram 03: Deformation under pressure and temperature
 
X = Load [MPa]
Y = Deformation [%]

Diagram 03 shows the elastic deformation of iglidur® at radial loads. At the maximum recommended surface pressure of 30 MPa, the deformation is less than 2%. A possible deformation could be, among others, dependant on the duty cycle of the load.

Maximum running speed

m/s	Rotating	Oscillating	linear
Long-term	1,1	0,8	3,0
Short-term	1,2	1,0	3,2

Table 02: Maximum surface speeds

Permissible surface speeds

Due to its rather good thermal conductivity and thermal resistance, iglidur HSD350 is suitable for speeds in the medium range. The permissible surface speed decreases with increasing surface pressure.

iglidur® HSD350	Application temperature
Minimum	-40°C
Max. long-term	+180°C
Maximum, short-term	+210°C
In addition secure axially from	+130°C

Table 03: Temperature limits

Temperature

The ambient temperatures strongly influence the properties of plain bearings. According to its field of application as autoclavable material, iglidur® HSD350 offers good thermal resistance. For temperatures over 130°C an axial securing of bearings is required.

Diagram 04: Coefficient of friction as a function of the surface speed, p = 1MPa
 
X = Surface speed [m/s]
Y = Coefficient of friction μ

Friction and wear

The coefficient of friction increases constantly and slowly over the speed, but remains below 0.3 μ up to a speed of 2.0 m/s.
 

iglidur® HSD350	Dry	Greases	Oil	Water
C. o. f. µ	0,07 - 0,23	0,09	0,04	0,04

Table 04: Coefficient of friction against steel
(Ra = 1 µm, 50 HRC)

Diagram 05: Wear, rotating with different shaft materials, pressure, p = 1MPa, v = 0.3m/s
 
X = Shaft material
Y = Wear [μm/km]

Diagram 06: Wear for oscillating and rotating applications with shaft material Cf53 hardened and ground steel, as a function of the load
 
X = Load [MPa]
Y = Wear [μm/km]

Shaft materials

Diagrams 05 and 06 display a summary of the test results with different shaft materials conducted with plain bearings made from iglidur® HSD350. At 0.3 m/s and 1 MPa surface pressure, a wide variety of shafts are suitable and provide good wear results. Hard-anodised aluminium, free cutting steel, hard-chromed Cf53, 304 stainless steel and high grade steel exhibit low wear. If the shaft material you plan on using is not shown in these test results, please contact us.

Chemicals	Resistance
Alcohol	+ up to 0
Hydrocarbons	+
Greases, oils without additives	+
Fuels	+ up to 0
Diluted acids	+
Strong acids	0
Diluted alkalines	+
Strong alkalines	0

+ resistant      0 limited resistance      - non-resistant
 
All information given at room temperature [+20°C]
Table 04: Chemical resistance

Moisture absorption

The moisture absorption of iglidur® HSD350 plain bearings is approximately 0.6% weight in standard climatic conditions. The saturation limit in water is 1.2 %weight. These values are so low that a moisture expansion need to be considered only in extreme cases.

Radiation resistance

Plain bearings made from iglidur® HSD350 are resistant up to a radiation intensity of 3 · 10² Gy.

UV resistance

When subjected to UV radiation, iglidur® HSD350 plain bearings change colour. However, hardness, compressive strength and wear resistance of the material do not change.

Vacuum

In vacuum, the moisture content is released as vapour. Due to its low moisture absorption, use in a vacuum is possible.

Electrical properties

Specific volume resistance	> 1013 Ωcm
Surface resistance	> 1014 Ω

Ø d1 [mm]	Housing H7 [mm]	Plain bearing F10 [mm]	Shaft h9 [mm]
to 3	+0,000 +0,010	+0,006 +0,046	-0,025 +0,000
> 3 to 6	+0,000 +0,012	+0,010 +0,058	-0,030 +0,000
> 6 to 10	+0,000 +0,015	+0,013 +0,071	-0,036 +0,000
> 10 to 18	+0,000 +0,018	+0,016 +0,086	-0,043 +0,000
> 18 to 30	+0,000 +0,021	+0,020 +0,104	-0,052 +0,000
> 30 to 50	+0,000 +0,025	+0,025 +0,125	-0,062 +0,000
> 50 to 80	+0,000 +0,030	+0,030 +0,150	-0,074 +0,000
> 80 to 120	+0,000 +0,035	+0,036 +0,176	-0,087 +0,000
> 120 to 180	+0,000 +0,040	+0,043 +0,203	+0,000 +0,100

Table 05: Important tolerances for plain bearings according to ISO 3547-1 after press-fit

 

Installation tolerances

iglidur® HSD350 plain bearings are standard bearings for shafts with h-tolerance (recommended minimum h9). The bearings are designed for press-fit into a housing machined to a H7 tolerance. After being assembled into a nominal size housing, in standard cases the inner diameter automatically adjusts to the F10 tolerances. For particular dimensions the tolerance differs depending on the wall thickness (please see product range table). In relation to the installation tolerance, the inner diameter changes with the absorption of humidity.