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igus® inc.

PO BOX 14349

East Providence

RI 02914

+1 800 521 2747

+1 401 438 7270

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iglide® UW500 - Material data

Materials table

General features	Unit	iglide® UW500	Test method
Density	g/cm³	1.49
Color		Black
Max. humidity absorption at 73° F/50% R. H.	Wt.-%	0,1	DIN 53495
Max. water absorption	Wt.-%	0.5
Coefficient of friction, dynamic against steel	µ	0.20 - 0.36
p x v value, max. (dry)	psi x fpm	10,000
Mechanical properties
Modulus of elasticity	psi	2,321.000	DIN 53457
Tensile strength at 68° C	psi	37,710	DIN 53452
Compressive strength	psi	20,310	DIN 53452
Maximum recommended surface pressure (68° F)	psi	20,310
Shore D hardness		86	DIN 53505
Physical and thermal properties
Upper long-term application temperature	°F	482
Upper short-term application temperature	°F	572
Lower application temperature	°F	599
Thermal conductivity	[W/m x K]	0.60	ASTM C 177
Coefficient of thermal expansion (at 73° F)	[K^-1 x 10^-5]	4	DIN 53752

Electrical properties
Specific volume resistance	Ωcm	< 10 ⁹	DIN IEC 93
Surface resistance²⁾	Ω	< 10 ⁹	DIN 53482

Permitted p x v values

For iglide® UW500 plastic bushings with 0.039 inches wall thickness in dry operation against a steel shaft, at 68° F, installed in a steel housing.

The plastic bushings 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 302° F. With special fastening of the bushing, these temperatures can go even beyond 392° F.

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

Deformation under load and temperatures

Compressive Strength

The graph shows how the iglide® UW500 plastic bushing elastically deform under loads. On the previous page, the graph shows the maximum p x v values at room temperature. The high p x v values are attained through the high temperature resistance.

Surface pressure, load

Maximum surface speed

fpm	Rotating	Oscillating	Linear
Constant	158	118	394
Short-term	295	217	591

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 394 fpm can be achieved. In dry operation the iglide® UW500 plastic bushings can be used anyhow up to 295 fpm on the short term.

Surface speed

p x v value, lubrication

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 482° F, the iglide® UW500 tolerates even 599° F on a short term. The bushings fastened by press-fit can indeed creep out through relaxation at temperatures above 302° F. Therefore for temperatures above 302° F, the firm seating of the bushing in the housing should be ascertained in tests, or, if necessary, ensure the firm fastening of the bushing through suitable mechanical measures.

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

Temperature limits

iglide® UW500	Application temperature
Lower	- 148 °F
Upper, long-term	+ 482 °F
Upper, short-term	+ 572 °F
Additional axial securing	+ 302 °F

Temperature

Coefficients of friction dependent on the surface speed, p = 108 psi

Friction and wear

With increasing load the friction of the bushing system with iglide® UW500 plastic bushing declines. Instead of that the coefficient of friction rises with increasing speed. This illustrates the excellent suitability of iglide® UW500 plastic bushing 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 bushing. 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
(Shaft finish = 40rms, 50 HRC)

iglide® UW500	Dry	Grease	Oil	Water
Coefficients of friction µ	0.1 - 0.4	0.09	0.04	0.04

Coefficients of friction

Wear resistance

Coefficients of friction dependent on the load, v = 1.96 fpm

Coefficients of friction dependent on the shaft surface (1050 Hard chromed)

Wear with different shaft materials, oscillating and rotating movement

Wear, rotating application with different shaft materials, load p = 108 psi, v = 98 fpm

Wear with different shaft materials in rotational operation, as a function of the pressure

Shaft materials

The figures display a summary of the results of tests with different shaft materials conducted with plastic bushings made of iglide® UW500. With low loads in the rotating application, the coefficients of wear are ideal with 1050 hard chromed shafts.

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

Shaft materials

Wear with pivoting and rotating applications with 1050 hard chromed shaft material, dependent on the load

Important tolerances for iglide® UW500 plastic bushings 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 plastic bushings are standard bushings for shafts with h-tolerance (recommended minimum h9).

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

Tolerances

Medium	Resistance
Alcohol	+
Hydrocarbons, chlorinated	+
Greases, oils, without additives	+
Fuels	+
Weak acids	+
Strong acids	+
Weak alkaline	+
Strong alkaline	+

+ resistant 0 conditionally resistant - non-resistant

Influence of moisture absorption of iglide® UW500 plastic bushings

Electrical properties

Specific volume resistance	> 10⁹ Ωcm
Surface resistance	> 10⁹ Ω

Chemical resistance

iglide® UW500 plastic bushings 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 plastic bushings is extremely low. In standard climatic conditions, it lies below 0.1 Wt-%. Thus the iglide® UW500 plastic bushings 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 plastic bushings 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.