iglidur® UW500 - material data

The most important specifications at a glance

The plain bearings made from iglidur UW500 were developed for underwater applications with high temperatures. Examples for this are water pumps in automotive engineering, as well as in the field of medical engineering and related sectors. Unless the underwater operation is explicitly stated, the information in this chapter describes iglidur UW500 in dry operation.

Descriptive technical specifications
Wear resistance at +23°C	- 🟧 🟧 🟧 ⬜️ ⬜️ +	More information on wear resistance
Wear resistance at +90°C	- 🟧 🟧 🟧 🟧 ⬜️ +
Wear resistance at +150°C	- 🟧 🟧 🟧 🟧 🟧 +
Slide property	- 🟧 🟧 ⬜️ ⬜️ ⬜️ +	Coefficient of friction, dynamic, against steel: µ 0.20 - 0.36
Wear resistance under water	- 🟧 🟧 🟧 🟧 🟧 +
Media resistance	- 🟧 🟧 🟧 🟧 🟧 +	More information on media resistance
Resistant to edge pressures	- 🟧 🟧 🟧 ⬜️ ⬜️ +
Resistant to shock and impact loads	- 🟧 🟧 ⬜️ ⬜️ ⬜️ +
Dirt resistance	- 🟧 🟧 ⬜️ ⬜️ ⬜️ +

When do I use this material?

When the plain bearings are used in liquids
At high speeds
At high temperatures
When very high chemical resistance is required

When do I use a different material?

If you are looking for a cost-effective underwater plain bearing for the normal temperature range -> iglidur UW
If you are looking for a cost-effective underwater plain bearing for rare applications -> iglidur H
If you are looking for a cost-effective universal plain bearing -> iglidur G

Download data sheet

Temperatures

iglidur UW500 can be used in applications where the continuous temperatures are +150°C. With special fastening of the bearing, these temperatures can even exceed +200°C. iglidur UW500 is one of the most temperature-resistant iglidur materials. An additional protection is required for temperatures higher than +150°C.

Temperatures, thermal expansion coefficient

min. application temperature	Upper application temperature, long-term	Upper application temperature, short-term	In addition secure axially from
-100°C	+250°C	+ 300°C	+150°C

Permissible surface speeds

iglidur UW500 plain bearings can be used in a wide range of applications, both in dry operation and in liquids. Due to hydrodynamic lubrication, which can be achieved at high speeds in underwater applications, surface speeds of far more than 1.5m/s can be achieved.

Surface speeds of various iglidur materials

Maximum surface speeds [m/s]	Rotating	Oscillating	linear
Long-term	0.8	0.6	2.0
Short-term	1.5	1.1	3.0

Permissible pv values

pv value, max. (dry)

MPa - m/s

0,35

Information on pv value and lubrication

Mechanical specifications

The compressive strength of iglidur UW500 plain bearings decreases with increasing temperatures. Diagram 02 illustrates this relationship. The maximum recommended surface pressure represents a mechanical material parameter. Conclusions about the tribology cannot be drawn from this. Diagram 03 shows the elastic deformation of iglidur UW500 under radial loads.

Friction and wear

Diagram 04 and 05 show the coefficient of friction of iglidur UW500 plain bearings as a function of the surface speed and the load. Friction and wear are also highly dependent on the mating partner. Ground surfaces with an average surface finish Ra of 0.1 to 0.4 are ideal.

Coefficients of friction against steel (Ra = 1μm, 50 HRC):

iglidur® UW500	dry	Greases	Oil	Water
Coefficient of friction μ	0.20 - 0.36	0.09	0.04	0.04

Shaft materials

Diagram 06 shows an excerpt of the results of tests with different shaft materials that were carried out with plain bearings made of iglidur UW500.

Further information on shaft materials

Chemical resistance

iglidur UW500 plain bearings are almost universally resistant to chemicals. They are only affected by concentrated nitric acid and sulphuric acid.

All data at room temperature [+20 °C], + resistant 0 conditionally resistant - non-resistant

Chemicals	Resistance
Alcohols	+
Greases, oils without additives	+
Hydrocarbons	+
Fuels	+
Strong alkalines	+
Strong acids	+
Diluted alkalines	+
Diluted acids	+

Moisture absorption

The moisture absorption of iglidur UW500 plain bearing is extremely low. In a normal climate, it is less than 0.1% weight. This means that even in underwater applications the iglidur UW500 plain bearing can be assembled without customising it to the installation conditions. The maximum total moisture absorption is 0.5% weight.

Installation tolerances

iglidur UW500 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 installation in a housing with nominal dimensions, the inner diameter of the bearings with F10 tolerance adjusts automatically. For certain dimensions, the tolerance deviates from this depending on the wall thickness (see product range).

Important tolerances according to ISO 3547-1 after press-fit:

Diameter d1 [mm]	Housing H7 [mm]	iglidur UW500 plain bearing F10 [mm]	Shaft h9 [mm]
up to 3mm	+0.000 +0.010	+0.006 +0.046	-0.025 +0.000
> 3 up to 6	+0.000 +0.012	+0.010 +0.058	-0.030 +0.000
> 6 up to 10	+0.000 +0.015	+0.013 +0.071	-0.036 +0.000
> 10 up to 18	+0.000 +0.018	+0.016 +0.086	-0.043 +0.000
> 18 up to 30	+0.000 +0.021	+0.020 +0.104	-0.052 +0.000
> 30 up 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 up to 180	+0.000 +0.040	+0.043 +0.203	+0.000 +0.100

Thermal conductivity

[W/m · K] 0.60

ASTM C 177

Coefficient of thermal expansion

(at +23°C) [K-1 · 10-5] 4

DIN 53752

Compressive strength

140MPa

Vacuum

In a vacuum, any moisture present degasses. Use in a vacuum is generally possible.

Radioactive radiation

Plain bearings made from iglidur UW500 are resistant to radiation up to a radiation intensity of 1 · 10⁵Gy. They are resistant to hard gamma radiation (1,000Mrad) as well as alpha and beta radiation (10,000Mrad). This makes iglidur UW500 one of the most radiation-resistant materials in the iglidur product range.