iglidur® J350 - Material data

Material table

General properties	Unit	iglidur® J350	Testing method
Density	g/cm³	1.44
Colour		yellow
Max. moisture absorption at +23°C/50% room humidity	% weight	0.3	DIN 53495
Max. moisture absorption	% weight	1.6
Coefficient of sliding friction, dynamic against steel	µ	0,01 - 0,20
pv value, max. (dry)	MPa x m/s	0.45
Mechanical properties
Flexural modulus	MPa	2,000	DIN 53457
Flexural 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
min. application temperature	°C	-100
Thermal 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 transitional resistance	Ωcm	> 10¹³	DIN IEC 93
Surface resistance	Ω	> 10¹⁰	DIN 53482

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diagram. 01: Permissible pv value for iglidur® J350 plain bearings with 1 mm wall thickness in dry operation against a steel shaft, at +20 °C, installed in a steel housing

iglidur® J350 blends universally good wear resistance, flexibility and temperature resistance into a very versatile iglidur® material with a broad application spectrum.

diagram.02: maximum recommended surface pressure as a function of temperature (60 MPa at 20 °C)

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® J350 plain bearings decreases with increasing temperatures. diagram. 02 illustrates this relationship.

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

Diagram 03: Deformation under pressure and temperature

Permissible sliding speeds

iglidur® J350 plain bearings are well suited for low and medium speeds in both rotating and oscillating applications. However, the wear rates are significantly better for rotating applications. Linear movements can also be supported well with iglidur® J350.

Maximum surface speed

m/s	Rotating	Oscillating	linear
permanent	1.3	1	4
Short-term	3	2.3	8

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. In some cases, the wear even decreases at +100 °C. Additional protection is required at temperatures higher than +140 °C.

iglidur® J350	Application temperature
Minimum	-100°C
Max. long-term	+180°C
Maximum, short-term	+220 °C
In addition secure axially from	+140°C

Diagram 04: Coefficient of friction as a function of the surface speed, p = 1MPa

Friction and wear

The coefficient of friction of iglidur® J350 in dry operation against steel is in a very good range. They decrease significantly at higher sliding speeds. This benefits the service life of the plain bearings in continuous running applications with high sliding speeds. diagram. 04 illustrates the relationship. Especially at loads greater than 2 MPa, iglidur® J350 plain bearings are clearly superior to other bearings in rotating applications.

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

Shaft materials

coefficient of friction for iglidur® J350 against steel (Ra = 1 μm, 50 HRC):

iglidur® J350	dry	Greases	Oil	Water
coefficient of friction μ	0,1-0,2	0.09	0.04	0.04

Diagram 06: Coefficient of friction as a function of the shaft surface (Cf53 shaft)

diagrams 06 and 07 show an extension of the results of tests with different shaft materials.iglidur® J350 bearings are suitable for all sliding partners, but one pairing stands out when you look at the wear data from the tests: iglidur® J350 against 304 SS.There are not many bearing materials that are suitable for the otherwise difficult shaft partner stainless steel (304 SS) and achieve the best wear rates.Excellent wear results are also shown with hard-anodised aluminium shafts.If the shaft material you have in mind is not included in the test results presented here, please contact us.

Shaft materials

diagram. 07: Wear, rotating with different

Chemical resistance

iglidur® J350 plain bearings are resistant to diluted acids and alkalis, alcohols, cleaning agents and lubricants. iglidur® J350 is attacked by esters, ketones, chlorinated hydrogens, aromatics and highly polar solvents.

+ resistant 0 conditionally resistant - not resistant

Medium	Resistance
Alcohols	+
Hydrocarbons	+ up to 0
Greases, oils without additives	+
Fuels	+
Diluted acids	+
Strong acids	+ up to 0
Diluted alkalines	+
Strong alkalines	+

Radioactive radiation

Bearings made from iglidur® J350 are resistant to radiation up to a radiation intensity of 2 - 10² Gy.

UV resistance

iglidur® J350 plain bearings have limited resistance to UV radiation.

Vacuum

In a vacuum, iglidur® J350 plain bearings only degas to a very small extent. Use in a vacuum is possible for dry bearings

Electrical specification

iglidur® J350 plain bearings are electrically insulating.

Electrical properties
Specific transitional resistance	> 10¹³ Ωcm
Surface resistance	> 10¹⁰ Ω

Moisture absorption

The moisture absorption of iglidur® J350 is low and can be neglected when using the standard plain bearings. Even when completely saturated, iglidur® J350 absorbs no more than 1.6 % water.

Maximum moisture absorption
at +23 °C/50 % r. humidity	0.3% weight
Max. moisture absorption	1.6% weight

Installation tolerances

iglidur® J350 plain bearings are standard bearings for shafts with h-tolerance (recommended minimum h9). The bearings are designed to be pressed into an H7-toleranced mounting. After installation in a mounting with nominal dimensions, the inner diameter of the bearing with F10 tolerance adjusts itself automatically. For certain dimensions, the tolerance deviates from this depending on the wall thickness (see product range).

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 up to 6	0 - 0.030	+0.010 +0.058	0 +0.012
> 6 up to 10	0 - 0.036	+0.013 +0.071	0 +0.015
> 10 up to 18	0 - 0.043	+0.016 +0.086	0 +0.018
> 18 up to 30	0 - 0.052	+0.020 +0.104	0 +0.021
> 30 up 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