iglidur® GLW - Material data

Material table

General specification

Unit

iglidur® GLW

Test method

density

g/cm³

1,36

Colour

black colour

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

% by weight

1,3

DIN 53495

max. total moisture absorption

wt.-%

5,5

Sliding friction coefficient, dynamic, against steel

0,1 - 0,24

pv value, max. (dry)

MPa x m/s

0,3

Mechanical specification

flexural modulus

MPa

7.700

DIN 53457

flexural strength at 20°C

MPa

235

DIN 53452

Compressive strength

MPa

maximum recommended surface pressure (20°C)

MPa

Shore D hardness

DIN 53505

Physical and thermal specification

Upper long-term application temperature

°C

+100

upper short-term application temperature

°C

+160

Lower application temperature

°C

-40

thermal conductivity

[W/m x K]

0,24

ASTM C 177

coefficient of thermal expansion (at 23°C)

[K-1 x 10-5]

DIN 53752

Electrical specification

Volume resistivity

Ωcm

> 1011

DIN IEC 93

surface resistance

> 1011

DIN 53482

Table 01: Material data

Download data sheet

With plain bearings made from the material iglidur® GLW, we can offer our customers an alternative to iglidur® G for high-volume applications. With similar characteristics to iglidur® Gplain bearings, plain bearings made from iglidur® GLW are particularly recommended for primarily static loads. For these applications, where the dynamic specifications of iglidur® G can be largely dispensed with, they represent a very cost-effective alternative.

Mechanical specification
The maximum recommended surface pressure represents a mechanical material parameter. It is not possible to draw conclusions about the tribology from this. the compressive strength of iglidur® GLW plain bearings decreases with increasing temperatures. diagram 02 illustrates this relationship.

diagram. 03 shows the elastic deformation of iglidur® GLW under radial load. Under the maximum recommended surface pressure of 70 MPa and at room temperature, the deformation is less than 3 %; under this load, plastic deformation can be ignored. However, this also depends on the duration of exposure.

Maximum surface speed

m/s

rotating

oscillating

linear

continuous

0,8

0,6

2,5

short-term

0,7

Table 02: Maximum surface speed

Permissible sliding speeds
iglidur® GLW has been developed for low to medium sliding speeds. In continuous operation, a maximum of 0.8 m/s (rotating) or 2.5 m/s (linear) is permissible. Here too, the maximum values shown in Table 02 are only possible at the lowest pressure loads and are often not achieved in practice, as the temperature rises above the permissible maximum value.

iglidur® GLW

Application temperature

below

- 40 °C

upper, long-term

+ 100 °C

upper, short-term

+ 160 °C

additional axial protection from

+ 80 °C

Table 03: Temperature limits for iglidur® GLW

Temperatures
The ambient temperature has a strong influence on the specification of plain bearings. diagram 02 illustrates this relationship. Bearing wear increases with rising temperatures in the bearing system. Additional protection is required at temperatures higher than +80 °C.

Friction and wear
The coefficient of friction μ changes with increasing load, as does the wear resistance (diagram. 04 and 05).

iglidur® GLW

dry

Grease

oil

water

coefficient of friction µ

0,10 - 0,24

0,09

0,04

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

Wear, rotating applications with different

Shaft materials
Friction and wear are highly dependent on the mating partner. Shafts that are too smooth increase both the coefficient of friction and the wear of the bearing. Ground surfaces with a centre roughnessRa between 0.1 and 0.2 μm are best suited (diagram. 06). Fig. 06 shows an extension of the results of tests with different shaft materials that were carried out with plain bearings from iglidur® GLW. If the shaft material you require is not included in this list, please contact us.

Shaft materials

Medium

Resistance

Alcohols

+ to 0

Hydrocarbons

Greases, oils, not additivated

fuels

Diluted acids

0 to -

strong acids

Dilute bases

strong bases

+ resistant 0 conditionally resistant - not resistant

All data at room temperature [+20 °C]Table 05: chemical resistance of iglidur® GLW

Chemical resistance
iglidur® GLW plain bearings have good resistance to chemicals. They are resistant to most lubricants. iglidur® GLW is not attacked by most weak organic and inorganic acids.

**
Electrical specification

Volume resistivity

> 1011 Ωcm

surface resistance

> 1011 Ω

Radioactive radiation
Bearings made of iglidur® GLW are resistant to radiation up to a radiation intensity of 3 x 10² Gy.

Maximum moisture absorption

at +23 °C/50 % room humidity.

1.3 % by weight

max. total moisture absorption

5.5 % by weight

Table 06: Moisture absorption

Moisture absorption
The moisture absorption of iglidur® GLW bearings is about 1.3 % in a normal climate. The saturation limit in water is 5.5 %. This must be taken into account under appropriate operating conditions.

Diameter****d1 [mm]

shaft h9**[mm]**

iglidur® GLW****E10 [mm]

housing H7**[mm]**

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

> 50 to 80

0 - 0,074

+0,060 +0,180

0 +0,030

> 80 to 120

0 - 0,087

+0,072 +0,212

0 +0,035

> 120 to 180

0 - 0,100

+0,085 +0,245

0 +0,040

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

Installation tolerances
iglidur® GLW plain bearings are standard bearings for shafts with tolerance (recommended minimum h9) and are designed to be pressed into aH7-toleranced mounting. After installation in a mounting with nominal dimensions, the inner diameter of the bearing with E10 tolerance adjusts itself. For certain dimensions, the tolerance deviates depending on the wall thickness (see product range).