|General features||Unit||iglide® F||Test method|
|Max. humidity absorption at 73° F/50% R. H.||Wt.-%||1.8||DIN 53495|
|Max. water absorption||Wt.-%||8.4|
|Coefficient of surface friction, dynamic, against steel||µ||0.1 - 0.39|
|p x v value, max. (dry)||psi x fpm||9,700|
|Modulus of elasticity||psi||1,682,000||DIN 53457|
|Tensile strength at 68° F||psi||37,710||DIN 53452|
|Permissible static surface pressure (68° F)||psi||15, 230|
|Shore D hardness||84||DIN 53505|
Physical and thermal properties
|Upper long-term application temperature||°F||284|
|Upper short-term application temperature||°F||356|
|Lower application temperature||°F||-40|
|Heat conductivity||[W/m x K]||0.65||ASTM C 177|
|Coefficient of thermal expansion (at 73°F)||[K-1 x 10-5 ]||12||DIN 53752|
|Specific forward resistance||Ωcm||< 10 3||DIN IEC 93|
|Surface resistance||Ω||< 10 2||DIN 53482|
For iglide® F plastic bushings with 0.0394 inch (1 mm) wall thickness in dry operation against a steel shaft, at 68° F, installed in a steel housing.
When bushings need to be electrically conductive, especially in applications that should keep out static, the iglide® F is the right choice. Moreover, the iglide® F plastic bushings are extremely pressure resistant.
At room temperature, they can handle loads up to 15,225 psi.
Figure 11.2 shows the elastic deformation of iglide® F with radial loads. Under the maximum recommended surface pressure of 15,225 psi, the deformation amounts to less than 3.5%.
A plastic deformation can be negligible up to this pressure load. It is however also dependent on the period of exposure.
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.
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.
|iglide® F||Application temperature|
|Lower||- 40 °F|
|Upper, long-term||+ 284 °F|
|Upper, short-term||+ 356 °F|
|Additional axial securing||+ 221 °F|
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 µ||0.08 - 0.15||0.09||0.04||0.04|
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.
|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|
|Alcohol||+ to 0|
|Greases, oils, without additives||+|
|Weak acids||0 to -|
|Strong alkaline||+ to 0|
|Specific forward resistance||< 103 Ωcm|
|Surface resistance||< 102 Ω|
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.
iglide® F plastic bushings are radiation resistant up to a radioactive intensity of 3 x 10² Gy.
iglide® F plastic bushings are permanently resistant against UV rays.
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.
In contrast to most other iglide® materials, the iglide® F plastic bushings are electrically conductive.