iglidur® UW500 - Material data

Material table

General specification

Unit

iglidur® UW500

Test method

density

g/cm³

1,49

Colour

black

max. Moisture absorption at 23°C/50% room humidity.

% by weight

0,1

DIN 53495

max. Water absorption3)

% by weight

0,5

Sliding friction coefficient, dynamic, against steel

0,20-0,36

pv value, max. (dry)

MPa x m/s

0,35

Mechanical specification

flexural modulus

MPa

16.000

DIN 53457

flexural strength at 20°C

MPa

260

DIN 53452

maximum recommended surface pressure (20°C)

MPa

140

Compressive strength

MPa

140

Shore D hardness

DIN 53505

Physical and thermal specification

Upper long-term application temperature

°C

+250

Upper short-term application temperature

°C

+300

upper short-term ambient temperature1)

°C

+300

Lower application temperature

°C

-100

thermal conductivity

W/m x K

0,60

ASTM C 177

coefficient of thermal expansion (at 23°C)

K-1 x 10-5

DIN 53753

Electrical specification

Volume resistivity

Ωcm

< 109

DIN IEC 93

Surface resistance2)

< 109

DIN 53482

Download data sheet

The plain bearings from iglidur® UW500 have been developed for underwater applications with higher temperatures. Examples include water pumps in automotive engineering, but also medical technology and related areas. The information in this chapter describes iglidur® UW500 in dry operation, unless underwater operation is expressly stated.

Mechanical specification
The maximum recommended surface pressure is a mechanical material parameter. Conclusions about the tribology cannot be drawn from this. The compressive strength of iglidur® UW500 bearings decreases with increasing temperatures. diagram. 02 illustrates this relationship.

diagram. 03 shows the elastic deformation of iglidur® UW500 bearings under radial load.

m/s

rotating

oscillating

linear

continuous

0,8

0,6

short-term

1,5

1,1

Tebelle 02: Maximum surface speed

Permissible sliding speeds
iglidur® UW500 bearings can be used both in dry running and in liquids in a wide range of applications. hydrodynamic lubrication, as can be achieved in the underwater area at high speeds, allows sliding speeds of far more than 1.5 m/s to be achieved.

iglidur® UW500

Application temperature

lower

- 100 °C

upper, long-term

+ 250 °C

upper, short-term

+ 300 °C

additional axial protection from

+ 150 °C

Table 03: Temperature limits for iglidur® UW500

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 materials iglidur®. Additional protection is required at temperatures above +150 °C.

friction and wear
diagram. 04 and 05 show the coefficient of friction of iglidur® UW500 plain bearings as a function of the sliding 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.

iglidur® UW500

dry

Grease

oil

water

coefficient of friction µ

0,2 - 0,36

0,09

0,04

Table 04: coefficient of friction for iglidur® UW500 against steel
(Ra = 1 µm, 50 HRC)

diagram. 06: Wear, rotating application with different

Shaft materials
Diagram 06 shows an extension of the results of tests with different shaft materials that were carried out with plain bearings from iglidur® UW500.

Shaft materials

diagram. 07: Wear with oscillating and rotating

Medium

Resistance

Alcohols

hydrocarbons

Greases, oils, not additivated

fuels

Diluted acids

strong acids

Diluted bases

strong bases

+ resistant 0 conditionally resistant - not resistant
All data at room temperature [+20 °C]
Table 05: chemical resistance of iglidur® UW500

Chemical resistance
iglidur® UW500 plain bearings are almost universally resistant to chemicals. They are only attacked by concentrated nitric acid and sulphuric acid.

**
Electrical specification

Volume resistivity

> 109 Ωcm

surface resistance

> 109 Ω

iglidur® UW500 plain bearings are electrically conductive.

Radioactive radiation
Bearings made of iglidur® UW500 are resistant to radiation up to a radiation intensity of 1 x 105Gy. iglidur® UW500 is thus one of the most radiation-resistant materials in theiglidur® programme. iglidur® UW500 is extremely resistant to hard gamma radiation and can withstand a radiation dose of 1,000 Mrad without any noticeable loss of its properties. The material also withstands an alpha or beta radiation of 10,000 Mrad practically undamaged.

Maximum moisture absorption

at +23 °C/50 % room humidity.

0.1 % by weight

max. total moisture absorption

0.5 % by weight

Table 06: Moisture absorption

Moisture absorption
The moisture absorption of iglidur® UW500 bearings is extraordinarily low. In a normal climate, it is less than 0.1% by weight. Thus, even in underwater applications, iglidur® UW500 bearings can be installed without adapting the installation conditions. The maximum water absorption is 0.5% by weight.

Diameter****d1 [mm]

shaft h9**[mm]**

iglidur® UW500****F10 [mm]

housing H7**[mm]**

to 3

0 - 0,025

+0,006 +0,046

0 +0,010

> 3 to 6

0 - 0,030

+0,010 +0,058

0 +0,012

> 6 to 10

0 - 0,036

+0,013 +0,071

0 +0,015

> 10 to 18

0 - 0,043

+0,016 +0,086

0 +0,018

> 18 to 30

0 - 0,052

+0,020 +0,104

0 +0,021

> 30 to 50

0 - 0,062

+0,025 +0,125

0 +0,025

> 50 to 80

0 - 0,074

+0,030 +0,150

0 +0,030

Table 07: Important tolerances according to ISO 3547-1 after press-fitting

Installation tolerances
iglidur® UW500 plain bearings are standard bearings for shafts with tolerance (recommended minimum h9).

The bearings are designed to be pressed into a h7-toleranced mounting. After installation in a mounting with nominal dimensions, the inner diameter of the bearing with F10 tolerance is automatically adjusted. For certain dimensions, the tolerance deviates depending on the wall thickness (see product range).