iglide® F - Material data

Maximum surface speed

fpm	Rotating	Oscillating	Linear
Continuous	157	118	590
Short-term	295	216	1181

Permitted surface speeds

The maximum permitted surface speeds are based on the operation period and the type of motion. A bushing is the most stressed in long-term rotating motions. Here the maximum speed for the iglide® F plastic bushing is 118 fpm.

The maximum values specified in Table 11.2 are attained only at minimum pressure loads. In practice these limit values are not often attained due to interactions.

Figure 11.3: Maximum recommended surface pressure dependent on the temperature

Temperatures

The ambient temperatures strongly influence the features of plastic bushings. The short-term permitted maximum temperature is 356° F. Long-term operating temperatures should not exceed 284° F.

With increasing temperatures, the compressive strength of iglide® F plstic bushings decreases. Fig. 11.3 clarifies this connection. The wear too rises.

Temperature limits

iglide® F	Application temperature
Lower	- 40 °F
Upper, long-term	+ 284 °F
Upper, short-term	+ 356 °F
Additional axial securing	+ 221 °F

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

Friction and wear

Similar to wear resistance, the coefficient of friction also changes with the load. Friction and wear are also dependent to a large degree on the shafting partner. Shafts that are too smooth not only increase the coefficient of friction, they can also increase the wear of the bushings. For iglide® F a ground surface with an average roughness of 20 rms is recommended for the shaft.

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

iglide® F	Dry	Grease	Oil	Water
Coefficients of friction µ	0.08 - 0.15	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 graphs show results of tests with different shaft materials conducted with plastic bushings made of iglide® F.

In the lowest load range, the hard-chromed shafts prove to be the most suitable counter partner in rotating applications with iglide® F plastic bushings.

The behavior is different in oscillating movements. With much higher wear values than for rotation, the 303 Stainless Steel shaft and the hard-chromed shaft are better than the Cold Rolled Steel shaft even at 290 psi.

Please contact us in case the shaft material scheduled by you is not included in these diagrams.

Important tolerances for iglide® F plastic bushings according to ISO 3547-1 after the press-fit.

Diameter d1 [inch]	Shaft h9 [inch]	iglide® F D11 [inch]
Up to 0.019685	0 - 0.0009843	0.0007874 - 0.0031496
> 0.1181 to 0.2362	0 - 0.0011811	0.0011811 - 0.0041339
> 0.2362 to 0.3937	0 - 0.0014173	0.0015748 - 0.0051181
> 0.3937 to 0.7087	0 - 0.0016929	0.0019685 - 0.0062992
> 0.7087 to 1.1811	0 - 0.0020472	0.0025591 - 0.0076771
> 1.1811 to 1.9685	0 - 0.0024409	0.0031496 - 0.0094488

Installation tolerances

iglide® F plastic bushings are standard bushings for shafts with h-tolerance (recommended minimum h9).

After the installation in a housing bore with the tolerance H7, the inner diameter of the bushing automatically adjusts to the D11 tolerance.

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

+ resistant      0 conditionally resistant      - non-resistant

Figure 11.10: Influence of moisture absorption of iglide® F plastic bushings

Electrical properties

Specific forward resistance	< 103 Ωcm
Surface resistance	< 102 Ω

Chemical resistance

iglide® F plastic bushings have a good resistance against chemicals. The particularly high resistance to lubricants is to be highlighted, even at high temperatures (around 248° F). Hence the iglide® F plastic bushings are particularly suitable for applications that call for lubrication necessitated by other parts.

The iglide® F is not affected by most weak organic and inorganic acids.

The moisture absorption of iglide® F plastic bushings amounts to about 1.8% in standard climatic conditions. The saturation limit in water is 8.4%. This should be considered according to application conditions.

Radioactive rays

iglide® F plastic bushings are radiation resistant up to a radioactive intensity of 3 x 10² Gy.

UV-resistant

iglide® F plastic bushings are permanently resistant against UV rays.

Vacuum

In application in vacuum, the potentially existent moisture content is degassed. For this reason only the dry iglidur® F plastic bushings are suitable for vacuum.

Electrical properties

In contrast to most other iglide® materials, the iglide® F plastic bushings are electrically conductive.