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iglidur® N54 - Material data

Material table

General specification

Unit

iglidur® N54

Test method

density

g/cm³

1,13

Colour

green colour

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

% by weight

1,6

DIN 53495

max. total moisture absorption

wt.-%

3,6

Sliding friction coefficient, dynamic, against steel

μ

0,15-0,23

pv value, max. (dry)

MPa x m/s

0,5

Mechanical specification

flexural modulus

MPa

1.800

DIN 53457

flexural strength at 20°C

MPa

70

DIN 53452

Compressive strength

MPa

30

maximum recommended surface pressure (20°C)

MPa

36

Shore D hardness

74

DIN 53505

Physical and thermal specification

Upper long-term application temperature

°C

+80

Upper short-term application temperature

°C

+120

Upper short-term ambient temperature1)

°C

+140

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

9

DIN 53752

Electrical specification

Volume resistivity

Ωcm

< 1013

DIN IEC 93

surface resistance

Ω

< 1011

DIN 53482

  1. Without additional load; no sliding movement; relaxation not excluded
    Table 01: Material data

diagram. 01: Permissible pv value for iglidur® N54 plain bearings with 1 mm wall thickness in dry operation against a steel shaft, at +20 °C, installed in a steel housing

X = surface speed [m/s]
Y = load [MPa]

iglidur® N54 is the first iglidur®material that is largely based on biopolymers. In addition to the fact that all iglidur®materials are already lubricant-free, this is a further step towards a positive environmental balance. Good coefficients of friction coupled with service lives that allow series use in sporadically moving applications give this material a firm place in the iglidur®programme.

diagram. 02: maximum recommended surface pressure as a function of temperature (36 MPa at +20 °C)

X = temperature [°C]
Y = load [MPa]

Mechanical specification
The maximum recommended surface pressure is a mechanical material parameter. It cannot be used to draw conclusions about the tribology. The compressive strength of iglidur® N54 plain bearings decreases with increasing temperatures. diagram.02 illustrates this relationship. At the long-term permissible application temperature of +120 °C, the permissible surface pressure is still just under 10 MPa.

Diagram 03: Deformation under pressure and temperature

X = load [MPa]
Y = Deformation [%]

diagram. 03 shows the elastic deformation of iglidur® N54 under radial load.

m/s

rotating

oscillating

linear

continuous

0,8

0,6

1

short-term

1,5

1,1

2

Table 02: Maximum surface speed

Permissible sliding speeds
Even if the typical application areas for iglidur®® N54 bearings are rather to be seen in intermittent operation, the maximum achievable speeds are still considerable, depending on the type of movement.The speeds specified in Table 02 are limit values for the lowest bearing loads. At higher loads, the permissible speed decreases with the load due to the limitations imposed by the pv value.

iglidur® N54

Application temperature

below

- 40 °C

upper, long-term

+ 80 °C

upper, short-term

+ 120 °C

additional axial protection from

+ 60 °C

Table 03: Temperature limits for iglidur® N54

Temperatures
The maximum permissible short-term temperature is +140 °C, which means that iglidur® N54 plain bearings can also be used in all applications with increased ambient temperatures. However, the compressive strength of iglidur® N54 plain bearings decreases with increasing temperatures. Additional protection is required at temperatures higher than +60 °C.

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 of iglidur® N54 is low. However, it must be noted that an excessively rough sliding partner increases the friction. We recommend a shaft roughness (Ra) of 0.1 to a maximum of 0.4 μm.

The coefficient of friction of the iglidur® N54 bearing is only slightly dependent on the sliding speed.

The influence of the load is greater, with the increase of which the coefficient of friction drops to 0.8.

Diagram 05: Coefficient of friction as a function of the pressure, v = 0.01m/s

X = load [MPa]
Y = coefficient of friction μ

iglidur® N54

dry

Grease

oil

water

coefficient of friction µ

0,15 - 0,23

0,09

0,04

0,04

Table 04: coefficient of friction for iglidur® N54 against steel
(Ra = 1 µm, 50 HRC)

Wear, rotating applications with different

diagram. 06: Wear, rotating application with different shaft materials, p = 1 MPa, v = 0.3 m/s

X = Shaft material
Y = wear [μm/km]

A = aluminium, hard anodised
B = free cutting steel
C = Cf53
D = Cf53, hard chrome-plated
E = HR carbon steel
F = 304 SS
G = high grade steel

Shaft materials
It is important to select the suitable shaft material. it cannot be said in general that iglidur®® N54 is better suited for hard or soft shafts, but "hard" shaft surfaces tend to lead to better service lives. At loads from 1 MPa, the wear increases noticeably and continuously.

Shaft materials
Wear for oscillating and rotating

diagram. 07: Wear in oscillating and rotating applications with Cf53 as a function of the load

Y = wear [μm/km]

A= rotating
B= oscillating

Medium

Resistance

Alcohols

+ to 0

Hydrocarbons

Greases, oils, not additivated

fuels

Diluted acids

0 to +

strong acids

-

Dilute bases

strong bases

0

+ resistant 0 conditionally resistant - not resistant
All data at room temperature [+20 °C]
Table 05: chemical resistance of iglidur® N54

Chemical resistance
iglidur® N54 plain bearings have good resistance to chemicals. They are resistant to most lubricants. Most weak organic and inorganic acids and bases do not attack iglidur® N54.

**
Electrical specification

Volume resistivity

< 1013 Ωcm

surface resistance

< 1011 Ω

Radioactive radiation
iglidur® N54 bearings can be used under radioactive radiation conditions. They are resistant up to a radiation intensity of 1 x 104 Gy.

Maximum moisture absorption

at +23 °C/50 % room humidity.

1.6 % by weight

max. total moisture absorption

3.6 % by weight

Table 06: Moisture absorption of iglidur® N54

Moisture absorption
The moisture absorption of iglidur® N54 bearings is less than 1.6 % in a normal climate. The saturation limit in water is 3.6 %.

Influence of moisture absorption

diagram. 10: Influence of moisture absorption

X = Moisture absorption [Gew.-%]
Y = Reduction inside ø [%]

Diameter****d1 [mm]

shaft h9**[mm]**

iglidur® N54****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

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

Installation tolerances
iglidur® UW 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 E10 tolerance adjusts itself. For certain dimensions, the tolerance deviates depending on the wall thickness (see product range).

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