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iglidur® J350 - Material data

Materials table

General features Unit iglidur® J350 test method
Density g/cm³ 1,44
Colour yellow
Max. humidity absorption at 23°C/50% R. H. % weight 0,3 DIN 53495
Max. water absorption % weight 1,6
Coefficient of surface friction, dynamic, against steel µ 0,01 - 0,20
PV values max. (dry) MPa x m/s 0,45

Mechanical properties
Bending E-module MPa 2.000 DIN 53457
Tensile strength at +20 °C MPa 55 DIN 53452
compressive strength MPa 60
Maximum recommended surface pressure (20° C) MPa 60
Shore D hardness 80 DIN 53505

Physical and thermal properties
Max. long term application temperature °C +180
Max. short term application temperature °C +220
Lower application temperature °C -100
Heat conductivity W/m x K 0,24 ASTM C 177
Coefficient of thermal expansion (at 23° C) K-1 x 10-5 7 DIN 53752

Electrical properties
Specific forward resistance Ωcm > 1013 DIN IEC 93
Surface resistance Ω > 1010 DIN 53482
'Table 01: Material Data





Figure 01: Permitted PV values for iglidur® J350 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® J350 combines universally good wear resistance, flexibility and temperature resistance into a very versatile iglidur® material with a broad application spectrum.


Fig. 02: Maximum recommended surface pressure according to the temperature (60 MPa at 20°C)

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

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

Mechanical properties

Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it. With increasing temperatures, the compressive strength of iglidur® J350 plain bearings decreases. Fig. 02 clarifies this connection.

iglidur® J350 plain bearings are suitable for high and medium loads. Fig. 03 shows the deformation under temperature. The behavior of materials under short-term stress is shown here. Different ambient temperatures make this noticeable only from about 60 MPa.


Maximum surface speed

m/s Rotary oscillating Linear
Constant 1,3 1 4
Short-term 3 2,3 8
Table 02: Maximum surface speeds

Permitted surface speeds

iglidur® J350 bearings are well suited for low and medium speeds, both in rotating and oscillating applications. The wear rates are much better in rotating applications. And linear motions can be well mounted with iglidur® J350.


iglidur® J350 Application temperature
Lower -100°C
Upper, long-term +180 °C
Upper, short-term +220 °C
Secure axially in addition +140 °C
Table 03: Temperature limits

Temperatures

The temperatures prevailing in the bearing system also have an influence on the bearing wear. The wear rate of the iglidur® J350 bearings changes only slightly at higher temperatures. Sometimes the wear decreases even at 100°C. An additional securing is recommended at temperatures higher than +140°C.


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

X = Surface 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

The coefficients of friction of iglidur® J350 in dry operation against steel lie in a very good range. They decrease significantly at higher surface speeds. This benefits the service life of the bearings in continuous operations with high surface speeds. Fig. 04 clarifies this connection. Especially with loads larger than 2 MPa, the iglidur® J350 bearings are clearly superior to other bearings in rotating applications.


Figure 06: Coefficients of friction dependent on the shaft surface (CF53 shaft)

X = Shaft surface finish RA [μm]
Y = Coefficient of friction μ

shaft materials

Figure 06 and 07 show a summary of the results of tests with different shaft materials. iglidur® J350 plain bearings are suitable for all gliding partners. A pairing however comes to mind when you look at the wear data of the tests: iglidur® J350 against V2A. There are not many bearing materials that are suitable for the otherwise rather difficult shaft partner stainless steel (V2A) and achieve best wear rates. Excellent wear results can also be observed with hard-anodized aluminum shafts. Please contact us in case the shaft material scheduled by you is not included here.

iglidur® J350 Dry Grease Oil Water
Coefficients of friction μ 0,1–0,2 0,09 0,04 0,04
Table 04: Coefficients of friction for iglidur® J350 against steel (Ra = 1 μm, 50 HRC)

Fig. 07: Wear, rotating with different Fig. 07: Wear, rotating with different shaft materials, p = 1 MPa, v = 0.3 m/s
 
Y = wear [μm/km]
 
A = Alu HC
B = machining steel
C = Cf53
D = Cf53, hard-chromed
E = St37
F = V2A
G = X90

Medium Resistance
Alcohols +
Hydrocarbons + to 0
Fats, oils, without additives +
Fuels +
Diluted acids +
Strong acids + to 0
Diluted bases +
Strong bases +
+ resistant      0 partially resistant      - non-resistant Table 05: Chemical resistance of iglidur® J350

Electrical properties

iglidur® J350 bearings are electrically insulating.

Specific forward resistance > 1013 Ωcm
Surface resistance > 1010 Ω

chemical resistance

iglidur® J350 plain bearings are resistant to diluted acids and alkalis, alcohols, detergents and lubricants. iglidur® J350 is affected by esters, ketones, chlorinated hydrocarbons, aromatics and highly polar solvents.

Radioactive rays

iglidur® J350 bearings are radiation resistant up to a radioactive intensity of 2 · 10² Gy.

UV-resistant

iglidur® J350 bearings are partially resistant against UV rays.

Vacuum

In a vacuum, iglidur® J350 bearing outgases only to a very small extent. The application in vacuum is possible only for dry bearings.


Maximum moisture absorption
by +23 °C/50 % r. F. 0,3 weight-%
Max. water absorption 1,6 weight-%
Table 06: Humidity absorption of iglidur® J350

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® J350 is low and can be disregarded when using standard bearings. Even at full saturation the iglidur® J350 does not absorb more than 1,6% of water.


Diameter
d1 [mm]
Shaft
h9 [mm]
iglidur® J350
E10 [mm]
Housing H7
[mm]
Up 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 iaw. ISO 3547-1 after press-fitting.

Installation tolerances

iglidur® J350 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 F10 tolerance. In certain dimensions the tolerance in dependence on the wall thickness deviates from this (See delivery program )