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iglidur® H370 - Material data

Material table

General specification

Unit

iglidur® H370

Test method

density

g/cm³

1,72

Colour

grey

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

% by weight

0,1

DIN 53495

max. total moisture absorption

wt.-%

0,1

Sliding friction coefficient, dynamic, against steel

µ

0,07 - 0,17

pv value, max. (dry)

MPa x m/s

0,74

Mechanical specification

flexural modulus

MPa

11.100

DIN 53457

flexural strength at 20°C

MPa

135

DIN 53452

Compressive strength

MPa

79

maximum recommended surface pressure (20°C)

MPa

75

Shore D hardness

82

DIN 53505

Physical and thermal specification

Upper long-term application temperature

°C

+200

Upper short-term application temperature

°C

+240

Lower application temperature

°C

-40

thermal conductivity

[W/m x K]

0,5

ASTM C 177

coefficient of thermal expansion (at 23°C)

[K-1 x 10-5]

5

DIN 53752

Electrical specification

Volume resistivity

Ωcm

< 105

DIN IEC 93

surface resistance

Ω

< 105

DIN 53482

Table 01: Material data

diagram. 01: Permissible pv value for iglidur® H370 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® H370 is a further development of the iglidur® H series. The material is characterised by particularly low total moisture absorption and significantly improved wear resistance. With regard to the mechanical and thermal characteristics, iglidur® H370 shows the same specification as iglidur® ® H.

diagram. 02: maximum recommended surface pressure as a function of temperature (75 MPa at +20 °C)

X = temperature [°C]
Y = load [MPa]

Mechanical specification
The maximum recommended surface pressure represents a mechanical material parameter. Conclusions on the tribology cannot be drawn from it. The compressive strength ofiglidur® H370 bearings decreases with increasing temperatures. diagram. 02 illustrates this correlation.

diagram. 03 shows how iglidur® H370 deforms elastically under radial load. Under the maximum recommended surface pressure of 75 MPa, the deformation at room temperature is approx. 2.5 %.

diagram. 03: Deformation under load and temperatures

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

m/s

rotating

oscillating

linear

continuous

1,2

0,8

4

short-term

1,5

1,1

5

Table 02: Maximum surface speed

Permissible sliding speeds
The maximum permissible surface speed depends on whether the temperature at the bearing point does not rise too much. iglidur® H370 is suitable for sliding speeds of up to 1.2 m/s (rotating) to 4 m/s (linear).

The maximum values given in Table 02 only apply to very low pressure loads and are often not achieved in practice.

iglidur® H370

Application temperature

below

- 40 °C

upper, long-term

+ 200 °C

upper, short-term

+ 240 °C

additional axial protection from

+ 100 °C

Table 03: Temperature limits for iglidur® H370

Temperatures
With increasing temperatures, the compressive strength of iglidur® H370 bearings decreases. The temperatures prevailing in the bearing system also have an influence on the bearing wear. The wear increases with rising temperatures. Additional protection is required at temperatures higher than +100 °C.

Diagram 04: Coefficient of friction as a function of the surface speed, p = 0.75MPa

X = surface speed [m/s]
Y = coefficient of friction μ

Friction and wear
The coefficient of friction, like the wear resistance, changes only slightly with increasing load and also with increasing speed (diagrams 04 and 05).

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

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

iglidur® H370

dry

Grease

oil

water

coefficient of friction µ

0,07 - 0,17

0,09

0,04

0,04

Table 04: coefficient of friction for iglidur® H370 against steel (Ra = 1 μm, 50 HRC)

diagram. 06: Wear, rotating application 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
The diagrams 06 and 07 show test results with different shaft materials, which were carried out with bearings made of iglidur® H370.

At loads of up to 2 MPa, the hard chrome-plated shaft is the best mating partner for iglidur® H370 bearings in rotating applications. The high wear values for 304 SS shafts, which tend to stick-slip due to their very smooth surface, are striking. The HR carbon steel shaft exhibits better values than Cf53 from 2 MPa, despite the same values in the lowest range. On the other hand, the 304 SS-shaft shows a clear superiority in swivelling movements.

Shaft materials
diagram. 07: Wear with swivelling and rotating

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

X = load [MPa]
Y = wear [μm/km]

A= Cf53
B= 304 SS
C= HR carbon steel
D= hard chrome plated

pink= swivelling
blue= rotating

Medium

Resistance

Alcohols

hydrocarbons

Greases, oils, not additivated

fuels

Diluted acids

-

strong acids

-

diluted bases

+ to 0

strong bases

+ to 0

+ resistant 0 conditionally resistant - not resistant
All data at room temperature [+20 °C]
Table 05: chemical resistance of iglidur® H370

Chemical resistance
iglidur® H370 plain bearings have good resistance to chemicals. They are resistant to most lubricants.

Most weak organic and inorganic acids do not attack iglidur®.

**
Electrical specification

Volume resistivity

< 105 Ωcm

surface resistance

< 105 Ω

iglidur® H370 plain bearings are electrically insulating.

Radioactive radiation
H370 withstands both neutron and gamma particle radiation without any noticeable loss of its excellent mechanical specification. Bearings made from iglidur® H370 are radiation-resistant up to a radiation intensity of 2 x 10² Gy.

Maximum moisture absorption

at +23 °C/50 % room humidity.

< 0.1 % by weight

max. total moisture absorption

< 0.1 % by weight

Table 06: Moisture absorption of iglidur® H370

Moisture absorption
The moisture absorption of iglidur® H370 bearings is less than 0.1 % in a normal climate. The saturation limit in water is also below 0.1 %. iglidur® H370 is therefore also the most suitable bearing material for underwater applications.

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® H370****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 for iglidur® H370 plain bearings according to ISO 3547-1 after press-fitting

Installation tolerances
iglidur® H370 plain bearings are standard bearings for shafts with tolerance (recommended minimum h9).the bearings are designed to be pressed into aH7-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).

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