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igus® Canada

180 Bass Pro Mills Drive

Concord

Ontario L4K 0G9

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iglide® H4 - Material data

Materials table

General features	Unit	iglide® H4	Test method
Density	g/cm³	1,79
Color		Brown
Max. humidity absorption at 23° C/50% R. H.	Wt.-%	0,1	DIN 53495
Max. water absorption	Wt.-%	0,2
Mechanical properties
Bending E-module	MPa	7.500	DIN 53457
Bending strength at 20° C	MPa	120	DIN 53452
Maximum recommended surface pressure (20° C)	MPa	65
Shore D hardness		80	DIN 53505
Physical and thermal properties
Upper long-term application temperature	°C	200
Upper short-term application temperature	°C	240
Upper short-term ambient temperature¹⁾	°C	260
Lower application temperature	°C	-40
Electrical properties
Specific forward resistance	Ωcm	> 10¹³	DIN IEC 93
Surface resistance	Ω	> 10¹²	DIN 53482
¹⁾ Without additional load; no gliding movement; relaxation not excluded.

Permitted p x v values

For iglide® H4 bearings with 1 mm wall thickness in dry operation against a steel shaft, at 20° C, installed in a steel housing.

iglide® H4 bearings stand for high carrying capacity, good abrasion resistance and good temperature resistance, besides the obvious economic factors. Temperatures up to 200° C, permitted surface pressure up to 65 MPa, and excellent chemical resistance are only some of the essential attributes. Solid lubricants lower the coefficient of friction and support the wear resistance, which was essentially improved compared to the likewise cost-efficient iglide® H2 bearings. iglide® H4 bearings are self-lubricating and suitable for all motions.

Figure 13.2: Deformation under load and temperatures

Surface pressure

Figure 13.2 shows the elastic deformation of iglide® H4 with radial loads. iglide® H4 has excellent elasticity values. This is beneficial in applications with edge loads and is the reason for a higher mechanical loss factor that indicates the vibration dampening capacity of a material. If a high static compressive strength is required, the other iglide® H bearing types are beneficial.

Surface pressure, load

Maximum surface speed

m/s	Rotating	Oscillating	Linear
Constant	1	0,7	1
Short-term	1,5	1,1	2

Permitted surface speeds

In contrast to the similarly cost-efficient iglide® H2 bearings, the iglide® H4 has an essentially favorable coefficient of friction. This accounts for the higher permitted surface speeds that can be attained with these bearings. In the dry operation, long-term speeds of 0.8 m/s are possible. The speeds stated in Table 13.2 are limit values for the lowest bearing loads. With higher loads, the permitted speed drops with the extent of the load due to the limitations by the p x v value.

Surface speed

p x v value, lubrication

Figure 13.3: Maximum recommended surface pressure dependent on the temperature

Temperatures

iglide® H4 is a temperature-resistant material. The short-term permitted maximum temperature is 240° C, and this enables the iglide® H4 bearings to be subjected for instance, to a paint drying process without further load. With increasing temperatures, the compressive strength of iglide® H4 bearings however decreases.

Fig. 13.3 clarifies this connection. The additional frictional heat in the bearing system should be considered in the temperatures.

Temperature limits

iglide® H4	Application temperature
Lower	- 40 °C
Upper, long-term	+ 200 °C
Upper, short-term	+ 240 °C

Temperature

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

Friction and wear

As said earlier, the coefficient of friction of the iglide® H4 bearing is very low. However it must be noted that an extremely coarse gliding partner can increase the friction. We recommend a shaft surface finish (Ra) of 0.1 to maximum 0.4 µm. The coefficient of friction of the iglide® H4 bearings is dependent on the surface speed only to a minor extent. The influence of the load is greater; an increase in load lowers the coefficient of friction up to 0.8.

Coefficients of friction for iglide® H4 against steel
(Ra = 1 µm, 50 HRC)

iglide® H4	Dry	Fat	Oil	Water
Coefficients of friction µ	0,08 - 0,25	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 13.6: 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

In many of the usable shaft materials, the iglide® H4 is the economical alternative to many other high-temperature bearings. The important thing is however the selection of the suitable shaft material. It cannot be generally stated that iglide® H4 is better suited for hard or soft shafts. Tests have however shown that pivoting motions yield better wear data. In rotating applications, the wear increases markedly from 10 MPa.

Shaft materials

Figure 13.8: Wear with various shaft materials in the rotating operation dependent on the load

Figure 13.9: Wear with pivoting and rotating applications with Cf53 shaft material, dependent on the load

Important tolerances for iglide® H4 bearings according to ISO 3547-1 after the press-fit.

Diameter d1 [mm]	Shaft h9 [mm]	iglide® H4 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® H4 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	+ to 0
Strong acids	+ to -
Diluted bases	+
Strong bases	+

+ resistant 0 conditionally resistant - non-resistant

Figure 13.10: Influence of humidity absorption of iglide® H4 bearings

Electrical properties

Specific forward resistance	> 10¹³ Ωcm
Surface resistance	> 10¹² Ω

Chemical resistance

iglide® H4 bearings have a good resistance against chemicals. They are resistant to most lubricants. The iglide® H4 is not affected by most weak organic and inorganic acids.

The humidity absorption of iglide® H4 bearings is about 0.1% in standard climatic conditions. The saturation limit in water is 0,2%. iglide® H4 is therefore the ideal material for wet areas.

Radioactive rays

iglide® H4 withstands both the neutron and gamma particle radiations without noticeable loss to its excellent mechanical properties. iglide® H4 bearings are radiation resistant up to a radioactive intensity of 2 x 10² Gy.

UV-resistant

iglide® H4 bearings alter under the influence of UV rays and other climatic influences. The surface becomes coarser, and the compressive strength declines. Therefore the use of iglide® H4 in applications directly exposed to climatic conditions should be tested.