iglide® H - Material data

Maximum surface speed

fpm	Rotating	Oscillating	Linear
Continuous	196	137	590
Short-term	295	216	787

Permitted surface speeds

The maximum permitted surface speed is dependent on whether the temperature in the bushing location rises strongly or not. iglide® H is suited in dry operation for a maximum surface speed of 196 fpm (rotating) and 590 fpm (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

Temperatures

iglide® H is an extremely temperature-resistant material. With a short-term permitted maximum temperature of 464° F, the iglide® H plastic bushings can be subjected, for example, to a paint drying process at low loads.

With increasing temperatures, the compressive strength of iglide® H plastic bushings decreases. Fig. 12.3 clarifies this connection. The temperatures prevailing in the bushing system also have an influence on the bushing wear. The wear rises with increasing temperatures. With increasing temperature in the range between room temperature and 302° F, 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
Additional axial securing	+ 248 °F

Figure 2.4: Coefficients of friction dependent on the surface speed, p = 108 psi

Friction and wear

Similar to wear resistance, the coefficient µ of friction also changes with the load. Notice that the coefficient of friction µ is slightly reduced with the increase in the surface speed, when the pressure stays the same.

Since the shaft material also has a large effect on the friction and wear, correct shaft selection is important for iglide® H. Shafts that are smoother than 4 rms increase the coefficient of friction. For applications with high loads, we recommend hardened and ground surfaces with an average roughness range of 12-16 rms.

Coefficients of friction for iglide® H against steel
(Shaft finish = 40 rms, 50 HRC)

iglide® H	Dry	Grease	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 psi, v = 98 fpm

Shaft materials

The graph displays a summary of the results of tests with different shaft materials conducted with plastic bushings made of iglide® H. The results clearly show that in rotating and oscillating applications the correct shaft selection is critical. For rotating applications, shafts made of 1050 hardened, ground steel and HR Carbon steel show the best wear values, the 3030 stainless steel shaft is best suited for oscillating movements. Also, hard chromed shafts with iglide® H plastic bushings are only recommended for low loads.

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

Important tolerances for iglide® H plastic bushings 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 plastic bushings are press-fit bushings for shafts with H tolerance (recommended minimum H9).

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

Medium	Resistance
Alcohol	+
Hydrocarbons, chlorinated	+
Greases, oils, without additives	+
Fuels	+
Weak acids	+ to 0
Strong acids	+ to -
Weak alkaline	+
Strong alkaline	+

+ resistant      0 conditionally resistant      - non-resistant

Electrical properties

Specific forward resistance	< 105 Ωcm
Surface resistance	< 102 Ω

Chemical resistance

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

The iglide® H plastic bushings cannot withstand hot, oxidizing acids.

The humidity absorption of iglide® H plastic bushings 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 plastic bushings are radiation resistant up to a radioactive intensity of 2 x 10² Gy.

UV-resistant

iglide® H plastic bushings 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 plastic bushings are electrically conductive.