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iglidur® N54 - Material data

Materials table

General features Unit iglidur® N54 test method
Density g/cm³ 1,13
Colour green
Max. humidity absorption at 23°C/50% R. H. % weight 1,6 DIN 53495
Max. water absorption % weight 3,6
Coefficient of surface friction, dynamic, against steel μ 0,15–0,23
PV values max. (dry) MPa x m/s 0,5

Mechanical properties
Bending E-module MPa 1.800 DIN 53457
Tensile 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 properties
Max. long term application temperature °C +80
Max. short term application temperature °C +120
Upper short-term ambient temperature1) °C +140
Lower application temperature °C -40
Heat 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 properties
Specific forward resistance Ωcm < 1013 DIN IEC 93
Surface resistance Ω < 1011 DIN 53482
1) Without additional load; no gliding motion; relaxation cannot be excluded
Table 01: Material specifications





Fig. 01: Admissible pv values for iglidur® N54 plain bearings with 1 mm wall thickness under dry running conditions against a steel shaft, at +20°C, installed into a steel housing.

X = Sliding speed [m/s]
Y = Load [MPa]


 
iglidur® N54 is the first iglidur® material based largely in biopolymers. In addition to the already assured lubricant-free properties of iglidur® materials, this is one further contribution to positive environmental stewardship. The good coefficients of friction in conjunction with holding times ensure that these materials have a permanent place in the iglidur® product range.


Figure 02: Maximum recommended surface pressure dependent on the temperature (120 MPa to +20 °C)

X = Temperature [°C]
Y = Load [MPa]
Figure 03: Deformation under load and temperatures

X = Load [MPa]
Y = Deformatio [%]

Mechanical properties

Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it. The compressive strength of iglidur® N54 bearings decreases with increasing temperatures. Fig. 02 clarifies this relationship. At the long-term permitted application temperature of 120°C, the permitted surface pressure still amounts to 10 MPa.

Figure 03 shows the elastic deformation of iglidur® N54 at radial loads.


m/s Rotary oscillating Linear
Constant 0,8 0,6 1
Short-term 1,5 1,1 2
Table 02: Maximum surface speeds

Permitted surface speeds

Even if the typical applications for iglidur® N54 plain bearings are more commonly for intermittent service, depending on the type of motion, the maximum attainable speeds can be quite high. The speeds stated in Table 02 are limit values for the lowest bearing loads. As loads increase, the admissible speed is reduced with higher loads due to the limitations of the pv value.


iglidur® N54 Application temperature
Lower - 40 °C
Upper, long-term + 80 °C
Upper, short-term + 120 °C
Secure axially in addition + 60 °C
Table 03: Temperature limits for iglidur® N54

Temperatures

The short-term admissible temperature limit is +140 °C, thus permitting the use of iglidur® N54 plain bearings in all applications with elevated ambient temperatures. However, the compressive strength of iglidur® N54 bearings decreases as temperatures increase. The additional frictional heat in the bearing system should be taken into account when considering the temperature limits. An additional securing is recommended at temperatures higher than +60°C.


Figure 04: Coefficients of friction dependent on the surface speed, p = 1 MPa

X = Sliding speed [m/s]
Y = Coefficient of friction μ
Figure 05: Coefficients of friction dependent on the load, v = 0,01 m/s

X = Load [MPa]
Y = Coefficient of friction μ

Friction and wear

iglidur® N54 has a low coefficient of friction. However it must be noted that a gliding partner with a rough surface finish increases the friction. We recommend shaft surface finishes (Ra) of 0.1 to a maximum of 0.4 µm.
 
The coefficient of friction of iglidur® N54 bearings is only marginally dependent on the surface speed.
 
The influence of the load is greater; an increase in load lowers the coefficient of friction up to 0.8.

iglidur® N54 Dry Grease Oil Water
Coefficients of friction µ 0,15 - 0,23 0,09 0,04 0,04

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


Wear, rotating application with various Figure 06: Wear, rotating application with different shaft materials, p = 1 MPa, v = 0,3 m/s
 
X = Shaft material
Y = Wear [μm/km]
 
A = Aluminum, hard-anodized
B = Machining steel
C = Cf53
D = Cf53, hard chrome-plated
E = St37
F = V2A
G = X90

shaft materials

It is important to select a suitable shaft material. As a rule, iglidur® N54 is better suited for hard or soft shafts, but "hard" shaft surfaces tend to have better holding times. Starting at loads of 1 MPa, wear increases measurably and continuously.

Wear in oscillating and rotating Fig. 07: Wear with oscillating and rotating applications with Cf53 as a function of the load
 
Y = wear [μm/km]
 
A= rotary
B= oscillating

Medium Resistance
Alcohols + to 0
Hydrocarbons +
Greases, oils without additives +
Fuels +
Diluted acids 0 to +
Strong acids -
Diluted bases +
Strong bases 0
+ resistant      0 limited resistance      - not resistant
All specifications at room temperature[+20 °C]
Table 05: Chemical resistance of the iglidur® bearings N54


Electrical properties

Specific forward resistance < 1013 Ωcm
Surface resistance < 1011 Ω

chemical resistance

iglidur® N54 plain bearings have good resistance to chemicals. They are resistant to most lubricants. iglidur® N54 is not impaired by most weak organic and inorganic acids and bases.

Radioactive rays

iglidur® N54 plain bearings can be used with restrictions when exposed to radiation. They are resistant up to a radiation intensity of 1 x 104 Gy.

UV-resistant

iglidur® N54 plain bearings are resistant to UV rays.

Vacuum

The low water elements degas in the vacuum. Applications under vacuum conditions are possible with restrictions.

Electrical properties

iglidur® N54 plain bearings are electrically insulating.


Maximum moisture absorption
by +23 °C/50 % r. F. 1,6 weight-%
Max. water absorption 3,6 weight-%

Table 06: humidity absorption of iglidur® N54

Effect of moisture absorption on plain bearings Diagram 10: Effect of moisture absorption
 
X = Moisture absorption [weight %]
Y = Reduction of inside diameter [%]

humidity absorption

The moisture absorption of iglidur® N54 bearings is about 1.6% in standard climatic conditions. The saturation limit in water is 3.6 %.


Diameter
d1 [mm]
Shaft
h9 [mm]
iglidur® N54
E10 [mm]
Housing H7
[mm]
Up 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 iaw. ISO 3547-1 after press-fitting.

Installation tolerances

iglidur® UW bearings are standard bearings for shafts with h-tolerance (recommended minimum h9).
 
The bearings are designed for press-fit in a housing with h7 tolerance. After the installation in a housing with nominal diameter, the inner diameter of the bearing automatically adjusts to the E10 tolerance. In certain dimensions the tolerance in dependence on the wall thickness deviates from this (See delivery program )