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igus® Canada

180 Bass Pro Mills Drive

Concord

Ontario L4K 0G9

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iglide® D - Material data

Materials table

General features	Unit	iglide® D	Test method
Density	g/cm³	1.40
Color		Green
Max. humidity absorption at 73° F/50% R. H.	Wt.-%	0.3	DIN 53495
Max. water absorption	Wt.-%	1.1
Coefficient of surface friction, dynamic, against steel	µ	0.08 - 0.26
p x v value, max. (dry)	psi x fpm	7706
Mechanical properties
Bending E-module	psi	290,000	DIN 53457
Bending strength at 68° F	psi	10,440	DIN 53452
Compressive strength	psi	10,150
Maximum recommended surface pressure (68° F)	psi	3,335
Shore D hardness		78	DIN 53505
Physical and thermal properties
Upper long-term application temperature	°F	194
Upper short-term application temperature	°F	230
Lower application temperature	°F	-58
Heat conductivity	[W/m x K]	0.25	ASTM C 177
Coefficient of thermal expansion (at 73° F)	[K^-1 x 10^-5]	11	DIN 53752
Electrical properties
Specific forward resistance	Ωcm	> 10¹⁴	DIN IEC 93
Surface resistance	Ω	> 10¹⁴	DIN 53482

Permitted p x v values

For iglide® D bearings with 1 mm wall thickness in dry operation against a steel shaft, at 68° F (20° C), installed in a steel housing.

The development of the iglide® D as a bearing material placed high performances and very low costs high up on the application profile. It should achieve particularly low coefficients of friction in the dry operation at high speeds. Bearings made of iglide® D are selectively supported by a combination of solid lubricants. The material containing silicon achieves extremely low coefficients of friction in dry operation and runs largely free of stick-slip effects.

Figure 24.2: Deformation under load and temperatures

Surface pressure

iglide® D bearings were developed mainly for low to medium radial loads. Figure 24.2 shows the elastic deformation of iglide® D with radial loads. Under the maximum recommended surface pressure of 21,750 psi (150 MPa), the deformation amounts to about 5.5%. A plastic deformation can be negligible up to this value. It is however also dependent on the period of exposure.

Surface pressure, load

Maximum surface speed

fpm	Rotating	Oscillating	Linear
Constant	296	217	1576
Short-term	591	414	1970

Permitted surface speeds

iglide® D bearings are suitable for high surface speeds. Speeds of up to 1969 fpm (10 m/s) are permitted in linear motions! Here too the specified maximum values can be achieved only with minimum pressure loads. The specified values show the speed at which due to friction an increase in temperature up to the long-term permitted value can occur.

Surface speed

p x v value, lubrication

Figure 24.3: Maximum recommended surface pressure dependent on the temperature

Temperatures

The short-term permitted maximum temperature is 230° F (110° C), and the long-term application temperature is 194° F (90° C). With increasing temperatures, the compressive strength of iglide® D bearings decreases. Fig. 24.3 clarifies this connection.

The temperatures prevailing in the bearing system have an influence on the bearing wear. The wear rises with increasing temperatures.

Temperature limits

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

Temperature

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

iglide® D	Dry	Fat	Oil	Water
Coefficients of friction µ	0.08 - 0.26	0.09	0.04	0.04

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

Friction and wear

The coefficient of friction declines like the wear resistance with increasing load. In contrast, a higher surface speed rarely acts on the coefficient of friction of an iglide® D bearing. iglide® D is suitable for applications in which high p x v values are induced mainly through the high surface speed and not as much through the surface pressure.

The dependency of the coefficient of friction of the iglide® D bearings on the shaft coarseness is distinct. In the Ra range between 0.4 and 0.6 µm, the coefficient of friction attains its optimum value. With values below and above this range, the friction of the bearing system rapidly rises. Other shaft materials can be used without significant losses. Good results were attained in tests even with non-metallic shafts. Ceramic and plastic shafts can also be used.

Coefficients of friction

Wear resistance

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

Figure 24.6: 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

Figures 24.7 and 24.9 display a summary of the results of tests with different shaft materials conducted with bearings made of iglide® D. Whereas in the lower load range the hard-chromed shaft is the most favorable for iglide® D bearings, the wear is lower with Cf53 and V2A shafts from 2 MPa upward.

The Cf53 and V2A shafts are recommendable in the low load range in pivoting applications.

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

Shaft materials

Figure 24.8: Wear with various shaft materials in the rotating operation dependent on the load

Figure 24.9: Wear in pivoting and rotating applications at constant load with various shaft materials, p = 290 psi (2 Mpa)

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

Diameter d1 [inch]	Shaft h9 [inch]	iglide® D E11 [inch]
Up to 0.019685	0 - 0.0009842	+0.0005511 + 0.0029133
> 0.1181 to 0.2362	0 - 0.0011811	+0.0007874 + 0.0037007
> 0.2362 to 0.3937	0 - 0.0014173	+0.0009842 + 0.0045275
> 0.3937 to 0.7086	0 - 0.0016929	+0.0012598 + 0.0055905
> 0.7086 to 1.1811	0 - 0.0020472	+0.0015748 + 0.0066929
> 1.1811 to 1.9685	0 - 0.0024409	+0.0019685 + 0.0082677

Installation tolerances

iglide® D 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 E11 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 24.10: Influence of humidity absorption of iglide® D bearings

Electrical properties

Specific forward resistance	> 10¹⁴ Ωcm
Surface resistance	> 10¹⁴ Ω

Chemical resistance

iglide® D bearings are resistant to very weak acids, diluted alkalis as well as to fuels and all kinds of lubricants.

The humidity absorption of iglide® D bearings amounts to about 0,2% in standard climatic conditions. The saturation limit in water is 1%. This low humidity absorption also allows the use in wet environment.

Radioactive rays

iglide® D bearings are radiation resistant up to a radioactive intensity of 3 x 10² Gy.

UV-resistant

iglide® D bearings are resistant to UV radiation, but the tribological properties deteriorate with continuous exposure.

Vacuum

In vacuum, iglide® D degases. The use in vacuum is possible only limitedly.

Electrical properties

iglide® D bearings are electrically insulating.

Delivery program

The iglide® D bearings are manufactured according to order specifications. Please contact us for applications with large numbers of bearings made of iglide® D as alternative to iglide® J.