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iglidur® HSD350 – material data

Technical data

General specificationsUnitiglidur® HSD350Testing method
Densityg/cm³1,39DIN EN ISO 1183–1
Colour beige 
Max. moisture absorption at 23 °C/50% r.h.% weight0,6ISO 175
Max. total moisture absorption% weight1,2ISO 62
Coefficient of friction, dynamic, against steelµ0,07 - 0,23 
pv value, max. (dry)MPa · m/s0,30 

Mechanical properties
Flexural modulusMPa2.150DIN EN ISO 178
Flexural strength at +20°CMPa67DIN EN ISO 178
Compressive strengthMPa44 
Max. recommended surface pressure (+20°C)MPa30 
Shore-D hardness 77DIN 53505

Physical and thermal properties
Max. application temperature long-term°C+180 
Max. application temperature short-term°C+210 
Min. application temperature°C-40 
Thermal conductivity[W/m · K]0,24ASTM C 177
Coefficient of thermal expansion (at +23 °C)[K-1 · 10-5]7DIN 53752

Electrical properties
Specific volume resistanceΩcm> 1013DIN IEC 93
Surface resistanceΩ> 1014DIN 53482

Table 01: Material properties table

Diagram 01: Permitted pv values for iglidur® HSD350 Diagram 01: Permissible pv values for iglidur® HSD350 plain bearings with a wall thickness of 1 mm dry operation against a steel shaft at +20°C, mounted in a steel housing.
X-axis = surface speed [m/s]
Y-axis = load [MPa]

iglidur HSD350 was specially developed for use in applications where decontamination by steam (e.g. in autoclaves) is necessary. iglidur® HSD350 offers an excellent price-performance ratio.

Surface pressure 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.

Deformation under load and temperatures 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


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® HSD350Application temperature
Max. long-term+180°C
Maximum, short-term+210°C
In addition secure axially from+130°C

Table 03: Temperature limits


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.

Coefficients of friction surface speed 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® HSD350DryGreasesOilWater
C. o. f. µ0,07 - 0,230,090,040,04

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

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

Alcohol+ up to 0
Greases, oils without additives+
Fuels+ up to 0
Diluted acids+
Strong acids0
Diluted alkalines+
Strong alkalines0
+ 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.


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
Housing H7
Plain bearing F10
Shaft h9
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.