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igus® Canada

180 Bass Pro Mills Drive

Concord

Ontario L4K 0G9

+1 (800) 965-2496

+1 905 760-8688

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iglide® UW - Material data

Materials table

General features	Unit	iglide® UW	Test method
Density	g/cm³	1.52
Color		Black
Max. humidity absorption at 73° F/50% R. H.	Wt.-%	0.2	DIN 53495
Max. water absorption³⁾	Wt.-%	0.8
Mechanical properties
Bending E-module	psi	2,784,000	DIN 53457
Bending strength at 68° F	psi	13,050	DIN 53452
Maximum recommended surface pressure (68° F)	psi	Not defined
Shore D hardness		78	DIN 53505
Physical and thermal properties
Upper long-term application temperature	°F	194
Upper short-term application temperature	°F	230
Upper short-term ambient temperature¹⁾	°F	284
Lower application temperature	°F	-58
Electrical properties²⁾
Specific forward resistance	Ωcm	> 10 ⁵	DIN IEC 93
Surface resistance	Ω	> 10 ⁵	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® UW bearings with 1 mm wall thickness in dry operation against a steel shaft, at 68° F (20° C), installed in a steel housing.

iglide® UW was developed for underwater applications in which the maximum temperatures clearly lie below 212° F (100° C). For application temperatures above this limit, the bearings made of iglide® UW500 are available. Though iglide® UW was developed for application in liquids, it is also suitable for dry operation. This one is particularly important in applications that call for both dry and wet operations. These applications can be seen often in practice. The features of the bearings made of iglide® UW described in this section apply to the dry operation. Unless it is expressly mentioned otherwise.

Figure 19.2: Deformation under load and temperatures

Surface pressure

Figure 19.3 shows the maximum recommended surface pressure for various temperatures. iglide® UW bearings are suitable for application under low to medium loads. High loads occur rather seldom in underwater applications.

The wear increases from a radial load of 725 psi (5 MPa) upward.

Surface pressure, load

Maximum surface speed

fpm	Rotating	Oscillating	Linear
Constant	98.5	79	394
Short-term	296	217	591

Permitted surface speeds

iglide® UW is excellent in both dry and wet operations. Through a hydrodynamic lubrication, attained under water with high speeds, surface speeds far above 394 fpm (2 m/s) can be achieved.

In dry operation the iglide® UW bearings can be used anyhow up to 294 fpm (1.5 m/s) on the short term.

Surface speed

p x v value, lubrication

Figure 19.3: Maximum recommended surface pressure dependent on the temperature

Temperatures

As mentioned earlier, the iglide® UW bearings are recommended rather for the low temperature range. Frictional heat should be taken into account in the dry operation from a maximum 194° F (90° C) temperature at the bearing position.

In underwater application the medium serves to put down the heat, which temperature is primarily important.

Temperature limits

iglide® UW	Application temperature
Lower	- 58 °F
Upper, long-term	+ 194 °F
Upper, short-term	+ 230 °F

Temperature

Figure 2.4: Coefficients of friction dependent on the surface speed, p =109 psi (0.75 Mpa)

Friction and wear

In underwater application the coefficients of friction are, as is known, essentially lower than in dry operation through the lubrication. In dry operation the coefficient of friction rises up to 0.4 with low loads. With higher loads, it lowers to 0.1.

The surface finishes of the shafts should not be extremely smooth in order to prevent a high adhesion effect and the entailing increases in the coefficient of friction.

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

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

iglide® UW	Dry	Fat	Oil	Water
Coefficients of friction µ	0.12 - 0.5	0.09	0.04	0.04

Coefficients of friction

Wear resistance

Figure 2.5: Coefficients of friction dependent on the load, v = 2 fpm (0.01 m/s)

Figure 19.6: Coefficients of friction dependent on the shaft surface (Cf53 shaft)

Fig. 2.7: Wear, rotating application with different shaft materials, load p = 109 psi (0.75 Mpa), v = 98.5 fpm (0.5 m/s)

Shaft materials

With low loads in rotary motion, the influence of the shaft materials given in Figure 19.7 on the iglide® UW bearings is relatively low. Figure 19.8 shows that this strongly varies with increasing loads.

Call your igus® consultant for queries on a special counter partner.

Shaft materials

Figure 19.8: Wear with various shaft materials in the rotating operation dependent on the load

Figure 19.9: Wear with pivoting and rotating applications with Cf53 shaft material, dependent on the load

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

Diameter d1 [inch]	Shaft h9 [inch]	iglide® UW E10 [inch]
Up to 0.019685	0 - 0.0009843	+0.000551 + 0.0021260
> 0.1181 to 0.2362	0 - 0.0011811	+0.000787 + 0.0026771
> 0.2362 to 0.3937	0 - 0.0014173	+0.000984 + 0.0032677
> 0.3937 to 0.7087	0 - 0.0016929	+0.001260 + 0.0040157
> 0.7087 to 1.1811	0 - 0.0020472	+0.001575 + 0.0048819
> 1.1811 to 1.9685	0 - 0.0024409	+0.001969 + 0.0059055

Installation tolerances

iglide® UW 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 the E10 tolerance.

Tolerances

Medium	Resistance
Alcohol	+ to 0
Hydrocarbons	+
Fats, oils, without additives	+
Fuels	+
Diluted acids	0 to -
Strong acids	-
Diluted bases	+
Strong bases	+ to 0

+ resistant 0 conditionally resistant - non-resistant

Figure 19.10: Influence of humidity absorption of iglide® UW bearings

Electrical properties

Specific forward resistance	> 10⁵ Ωcm
Surface resistance	> 10⁵ Ω

Chemical resistance

iglide® UW bearings are resistant to diluted alkalis and very weak acids as well as to solvents and all kinds of lubricants.

The humidity absorption of iglide® UW bearings amounts to about 0.2% in standard climatic conditions. The saturation limit in water is 0.8%. These values are so low that a moisture expansion need to be considered only in extreme cases.