iglide® UW500 - Material data

Materials table

General features	Unit	iglide® UW500	Test method
Density	g/cm³	1,49
Color		Black
Max. humidity absorption at 23° C/50% R. H.	Wt.-%	0,1	DIN 53495
Max. water absorption³⁾	Wt.-%	0,5
Mechanical properties
Bending E-module	MPa	Not defined	DIN 53457
Bending strength at 20° C	MPa	Not defined	DIN 53452
Maximum recommended surface pressure (20° C)	MPa	140
Shore D hardness		86	DIN 53505
Physical and thermal properties
Upper long-term application temperature	°C	250
Upper short-term application temperature	°C	315
Upper short-term ambient temperature¹⁾	°C	315
Lower application temperature	°C	-100
Electrical properties
Specific forward resistance	Ωcm	> 10 ⁹	DIN IEC 93
Surface resistance²⁾	Ω	> 10 ⁹	DIN 53482

¹⁾ Without additional load; no gliding motion; relaxation not excluded
²⁾ The good conductivity of this plastic can under certain conditions promote corrosion on a metallic contact body.
³⁾ With regard to the application of the material in direct contact with water, it must be pointed out that all results have been obtained under laboratory conditions with DI water (de-ionized water). Hence we recommend application-specific tests under real application conditions.

Permitted p x v values

For iglide® UW500 bearings with 1 mm wall thickness in dry operation against a steel shaft, at 20° C, installed in a steel housing.

The bearings made of iglide® UW500 have been developed for underwater applications with higher temperatures. Examples for this are water pumps in automotive construction, and also medical technology and related areas. iglide® UW500 can be used in applications with continuous temperatures of 150° C. With special fastening of the bearing, these temperatures can go even beyond 200° C.

The specifications in this section characterize iglide® UW500 in dry operation, if the underwater application is not expressly stated.

Figure 29.2: Deformation under load and temperatures

Surface pressure

Figure 29.2 shows how the iglide® UW500 bearings elastically deform under loads. On the previous page, Figure 29.1 shows the maximum p x v values at room temperature. The high p x v values are attained through the high temperature resistance. Figure 29.3 shows the particularly high maximum recommended surface pressure even at very high temperatures. Even at 200° C, more than 40 MPa loads are reached.

Surface pressure, load

Maximum surface speed

m/s	Rotating	Oscillating	Linear
Constant	0,8	0,6	2
Short-term	1,5	1,1	3

Permitted surface speeds

iglide® UW500 is excellent in both dry and wet operations. Through a hydrodynamic lubrication, attained under water with high speeds, surface speeds far above 2 m/s can be achieved. In dry operation the iglide® UW500 bearings can be used anyhow up to 1.5 m/s on the short term.

Surface speed

p x v value, lubrication

Figure 29.3: Maximum recommended surface pressure dependent on the temperature

Temperatures

The iglide® UW500 takes the top position also with regard to temperature resistance. With a permitted long-term application temperature of 250° C, the iglide® UW500 tolerates even 315° C on a short term. The bearings fastened by press-fit can indeed creep out through relaxation at temperatures above 150° C. Therefore for temperatures above 150° C, the firm seating of the bearing in the housing should be ascertained in tests, or, if necessary, ensure the firm fastening of the bearing through suitable mechanical measures.

Please contact us if there is any query about the application of the bearing.

Temperature limits

iglide® UW500	Application temperature
Lower	- 100 °C
Upper, long-term	+ 250 °C
Upper, short-term	+ 315 °C

Temperature

Figure 2.4: Coefficients of friction dependent on the surface speed, p = 0.75 MPa

Friction and wear

With increasing load the friction of the bearing system with iglide® UW500 bearings declines. Instead of that the coefficient of friction rises with increasing speed. This illustrates the excellent suitability of iglide® UW500 bearings with high loads. Friction and wear also depend to a high degree on the reverse partner. Extremely smooth and extremely coarse shafts enhance the coefficient of friction of the bearing. Ideal are smoothed surfaces with an average surface finish of Ra of 0.6 to 0.8.

Please contact us for the specifications of shaft surface finishes in underwater applications.

Coefficients of friction for iglide® UW500 against steel
(Ra = 1 µm, 50 HRC)

iglide® UW500	Dry	Fat	Oil	Water
Coefficients of friction µ	0,1 - 0,4	0,09	0,04	0,04

Coefficients of friction

Wear resistance

Figure 2.5: Coefficients of friction dependent on the load, v = 0.01 m/s

Figure 29.6: Coefficients of friction dependent on the shaft surface (Cf53 shaft)

Fig. 2.7: Wear, rotating application with different shaft materials, load p = 0.75 MPa, v = 0.5 m/s

Shaft materials

The figures display a summary of the results of tests with different shaft materials conducted with bearings made of iglide® UW500. With low loads in the rotating application, the coefficients of wear are ideal with Cf53 shafts.

Please contact us in case the shaft material scheduled by you is not included in this list.

Shaft materials

Figure 29.8: Wear with various shaft materials in the rotating operation dependent on the load

Figure 29.9: Wear with pivoting and rotating applications with Cf53 shaft material, dependent on the load

Important tolerances for iglide® UW500 bearings according to ISO 3547-1 after the press-fit.

Diameter d1 [mm]	Shaft h9 [mm]	iglide® UW500 F10 [mm]
Up to 0.5	0 - 0,025	+0,006 + 0,046
> 3 to 6	0 - 0,030	+0,010 + 0,058
> 6 to 10	0 - 0,036	+0,013 + 0,071
> 10 to 18	0 - 0,043	+0,016 + 0,086
> 18 to 30	0 - 0,052	+0,020 + 0,104
> 30 to 50	0 - 0,062	+0,030 + 0,150

Installation tolerances

iglide® UW500 bearings are standard bearings for shafts with h-tolerance (recommended minimum h9).

After the installation in a housing bore with H7 tolerance, the inner diameter of the bearing automatically adjusts to F10 tolerance.

Tolerances

Medium	Resistance
Alcohol	+
Hydrocarbons	+
Fats, oils, without additives	+
Fuels	+
Diluted acids	+
Strong acids	+
Diluted bases	+
Strong bases	+

+ resistant 0 conditionally resistant - non-resistant

Figure 29.10: Influence of humidity absorption of iglide® UW500 bearings

Electrical properties

Specific forward resistance	> 10⁹ Ωcm
Surface resistance	> 10⁹ Ω

Chemical resistance

iglide® UW500 bearings have almost universal chemical resistance. They are affected only by concentrated nitric acid and sulfuric acid. The chemicals list given at the end of this catalog gives detailed information over this.

The humidity absorption of iglide® UW500 bearings is extremely low. In standard climatic conditions, it lies below 0.1 Wt-%. Thus the iglide® UW500 bearings can be even mounted for underwater applications without any adaptation to the installation conditions. The maximum water absorption is 0.5 Wt-%.

Radioactive rays

iglide® UW500 bearings are radiation resistant up to a radioactive intensity of 1 x 10⁵ Gy. iglide® UW500 thus figures among the most radiation-resistant materials in the iglide® product range. iglide® UW500 is extremely resistant to strong gamma rays and withstands a radiation dose of 1,000 Mrad without any perceptible loss of any of its properties. The material also overcomes an alpha or beta radiation of 10,000 Mrad virtually unscathed.

UV-resistant

The excellent material features of the iglide® UW500 do not alter under UV radiation and other climatic influences.

Vacuum

The iglide® UW500 bearings can also be used almost unrestrictedly in vacuum. An evaporation takes place only to a minor degree.

Electrical properties

Bearings made of iglide® UW500 are electrically conductive.

Delivery program

The iglide® UW500 bearings are manufactured according to order specifications.

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iglide® UW500 - Material data

Materials table

Permitted p x v values

Surface pressure

Maximum surface speed

Permitted surface speeds

Temperatures

Temperature limits

Friction and wear

Coefficients of friction for iglide® UW500 against steel(Ra = 1 µm, 50 HRC)

Shaft materials

Important tolerances for iglide® UW500 bearings according to ISO 3547-1 after the press-fit.

Installation tolerances

Electrical properties

Chemical resistance

Radioactive rays

UV-resistant

Vacuum

Electrical properties

Delivery program

Country/Region

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Coefficients of friction for iglide® UW500 against steel
(Ra = 1 µm, 50 HRC)