iglide® H - Material data

Maximum surface speed

fpm	Rotating	Oscillating	Linear
Constant	295	138	591
Short-term	295	216	787

Permitted surface speeds

The maximum permitted surface speed is dependent on whether the temperature in the bearing location rises strongly or not. iglide® H is suited in dry operation for a maximum surface speed of 197 fpm (1 m/s) (rotating) and 787 fpm (4 m/s) (linear) respectively. Linear movements enable higher surface speeds, as a large area of the shaft contributes to the cooling.

Figure 12.3: Maximum recommended surface pressure dependent on the temperature

Figure 12.4: Wear dependent on the temperature, rotating application with p = 108 psi (0.75 Mpa) and V = 98.5 fpm (0.5 m/s) (Cf53 shaft)

Temperatures

iglide® H is an extremely temperature-resistant material. With a short-term permitted maximum temperature of 392° F (200° C), the iglide® H bearings can be subjected, for example, to a paint drying process at low loads.

With increasing temperatures, the compressive strength of iglide® H bearings decreases. Fig. 12.3 clarifies this connection. The temperatures prevailing in the bearing system also have an influence on the bearing wear. The wear rises with increasing temperatures. With increasing temperature in the range between room temperature and 302° F (150° C), compressive strength and wear, if only to a minor degree, drop for the iglide® H.

Temperature limits

iglide® H	Application temperature
Lower	- 40 °F
Upper, long-term	+ 392 °F
Upper, short-term	+ 464 °F

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

Friction and wear

The coefficient of friction alters like the wear resistance with increasing load. Interestingly, the friction coefficient µ lowers slightly with the increase of surface speed at constant load (see Figures. 12.5 and 12.6)

As the counter partner of iglide® H also has a large influence on friction and wear, the choice of the appropriate shaft can be decisive. More than Ra = 0.1 µm shaft surface finish raises the coefficient of friction. For applications with high loads, we recommend hardened and smoothed surfaces with an average surface finish of Ra = 0.3 to 0.4 µm.

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

iglide® H	Dry	Fat	Oil	Water
Coefficients of friction µ	0,07 - 0,2	0,09	0,04	0,04

Fig. 2.7: Wear, rotating application with different shaft materials, load p = 108.75 psi (0.75 Mpa), v = 98.4 fpm (0.5 m/s)

Shaft materials

Figure 12.8 displays a summary of the results of tests with different shaft materials conducted with bearings made of iglide® H. Bearings made of iglide® H display a distinctly different behavior with different shaft materials in rotating and pivoting applications. While the Cf53 and St37 shafts feature the best coefficients of wear in rotating applications, the V2A shaft that figures way below in rotating movements is the most suited for pivoting movements. In contrast, hard-chromed shafts with iglide® H bearings have advantage only with very low loads.

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

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

Diameter d1 [mm]	Shaft h9 [mm]	iglide® H F10 [mm]
Up to 0.019685	0 - 0.0009842	+0.0002362 + 0.0018110
> 0.118 to 0.236	0 - 0.0011811	+0.0003937 + 0.0022835
> 0.236 to 0.394	0 - 0.0014173	+0.0005118 + 0.0027953
> 0.394 to 0.709	0 - 0.0016929	+0.0006299 + 0.0033858
> 0.709 to 1.181	0 - 0.0020472	+0.0007874 + 0.0040945
> 1.181 to 1.969	0 - 0.0024409	+0.0009843 + 0.0049213
> 1.969 to 3.150	0 - 0.0029134	+0.0011811 + 0.0059055

Installation tolerances

iglide® H bearings are press-fit 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.

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

Electrical properties

Specific forward resistance	< 105 Ωcm
Surface resistance	< 102 Ω

Chemical resistance

iglide® H bearings have a good resistance against chemicals. Hence even aggressive chemicals can act as lubricant.

The iglide® H bearings cannot withstand hot, oxidizing acids.

The humidity absorption of iglide® H bearings is about 0.1% in standard climatic conditions. The saturation limit in water is 0,3%. iglide® H does not soak and is therefore very well suited for application in wet environment.

Radioactive rays

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

UV-resistant

iglide® H bearings are only conditionally resistant to UV rays. Under the influence of weathering, the surface of iglide® H becomes harsher, and the compressive strength of the material drops.

Vacuum

Note that for use in vacuum, water elements, even if only little, should be degassed.

Electrical properties

iglide® H bearings are electrically conductive.